EP2116067A1

EP2116067A1 - Stereo projection with interference filters

Info

Publication number: EP2116067A1
Application number: EP07846350A
Authority: EP
Inventors: Helmut Jorke
Original assignee: Infitec GmbH
Current assignee: Infitec GmbH
Priority date: 2006-11-19
Filing date: 2007-11-19
Publication date: 2009-11-11
Also published as: DE102006054713A1; US20100066813A1; WO2008061511A1; JP5091246B2; DE102006054713B4; JP2010510532A

Abstract

The invention relates to a stereo projection system and a method for generating an optically perceptible three-dimensional pictorial reproduction. For each of the two perspective partial images (left or right) of the stereo image, regions of the visible spectrum, which are defined differently by colour filters, are masked in such a way that a plurality of only limited spectral intervals is transmitted in the region of the colour perception blue (B), green (G), and red (R). The position of the transmitted intervals is selected differently for the two perspective partial images. The number of transmitted intervals for the two perspective partial images is, according to the invention, selected as lower than 6 (b) either for the image generation or for the image detection by the stereo glasses, and equal to 6 (a). In the event of a reduced number (b), at least one transmitted interval for one of the perspective partial images is selected in transmission in the region of two colour perceptions blue (B), green (G) or red (R), and created by right-left permutation and subsequent combination with an adjacent interval. According to the permutated intervals, the associated image data is analogously permutated. In this way, the cost of the filters, especially interference filters for the stereo projection system or for the method for producing an optically perceptible, three-dimensional pictorial reproduction, is significantly reduced without considerably affecting the reproduction quality. The unpleasant flickering is also reduced.

Description

Stereo projection with interference filters

The invention relates to methods for stereoscopic reproduction of images, video clips, films, etc., or to a stereo projection system for carrying out such a method.

There are several techniques for three-dimensional rendering. The anaglyph technique has long been known: through simple red / green separation of the two left / right partial images and observation of the summation image by means of filter glasses _f which allow only the red or the green color component for each eye, a stereoscopic image is created for the observer Impression. The green color is assigned exclusively to the left and the red color exclusively to the right field, disadvantageous is the system-related color filtering, so that no realistic color images can be reproduced with this technique.

Another method that is occasionally used on television is the PuIfrich method. Again, spectacles are used for viewing, but the beam path is darkened more for one eye than for the other. For this purpose, color glasses are also often used (for cost reasons), although it depends only on the different Äbdunklung. Due to the different brightness, the visual information is easy Delays to the processing areas of the brain. If an illustrated scene moves at a right angle to the viewer, the temporal delay of the perception of an eye causes parallax and the scene is spatially perceived. The advantage of this technique is the simplicity of the rendering technique. The disadvantage is that the scene must be constantly in motion, which is often felt after some time as unpleasant. In addition, the scene must always move in the same direction, otherwise the depth information would be reversed, and the movement speed must be kept constant, otherwise the depth information is not reproduced correctly.

In the computer area, a different method is often used: the right / left portions are separated by so-called shutter glasses that pass through electrically switchable polarizing filter, the light, eg from a monitor or projector, alternately only for the right or left eye of the beholder. The shutter glasses are synchronized with the playback device (eg monitor), so that only the respective partial images reach the left or right eye from the alternating sequence of left / right partial images shown there. Although this technique provides true-to-color reproduction, it has the disadvantage that the brightness is greatly reduced, since (alternately) the image is perceived only by one eye of the observer (ie only half the total brightness of the monitor) and in addition the polarization filters already to absorb light (also in the passage phase). In addition, the constant left / right blanking requires a very high refresh rate (at least 120-160Hz) so that a disturbing flicker effect is suppressed. Another principle is based on the interference filter technique. A method for producing an optically three-dimensionally perceptible image reproduction using the interference filter technique or a corresponding stereo projection system is known from DE 199 24 167 B4. Two interference filters with slightly different spectral filter effect are used for the projection. Each filter has three narrow passbands (trans mittent intervals) for the primary colors blue, green and red. The width of the passbands is chosen in the range of 20 nm. The passage areas of the two filters are arranged offset from each other so arranged that they show no overlap and thus formed orthogonal to each other. With the aid of the two mutually orthogonal interference filters, each of which shows three transmission ranges for the three primary valences in the region of blue, green and red color perception, two separate perspective partial images, one for the left eye and one for the right eye, can be realized with the aid of which a three-dimensional perceptible image can be projected onto a screen. This image is selectively perceived by a viewer through the separated eyes by having spectacles whose left lens shows a filter characteristic corresponding to the one interference filter and the right lens shows a filter characteristic corresponding to the other interference filter. As a result, the two perspective partial images on the screen can be safely separated from one another eye-specifically and produce the stereo effect or the three-dimensional effect of the images on the viewer.

The known prior art is characterized in that the optical components for generating or for detecting the left or the right Perspektivteilteiles are each realized identically. That is, for generating or detecting the left perspective partial image In each case the same optical polarization, the same optical frequency distribution and / or the same temporal activity control is used for the generation or for the acquisition of the respective partial image. In contrast, a different and complementary optical or temporal property is selected for generating or for detecting the other right perspective partial image in order to enable a secure and reliable separation of the two perspective partial images (channel separation).

The present invention has for its object to develop a method for stereo projection systems or to provide a stereo projection system, which shows a good color reproduction, a reliable perspective Teilbildentren- tion with low flicker and also shows a simple structure, which proves to be robust.

The object is achieved by the method having the features according to claim 1 and a stereo projection system having the features of claim 6.

Advantageous developments of the invention are the subject of the dependent claims.

The invention is characterized in that the color filters for the two perspective partial images either for image formation or image acquisition are designed so that the number b of the transmitting intervals compared to the known prior art numerically (a) are reduced, whereas the other color filters for the two perspective partial images are typically equal to 6 (a) and structurally different.

The invention shows for exactly one side of the system either for imaging or image capture a reduced number b of transmitting intervals for the two compared to the number (a) of the other side Perspective partial images which are smaller than 6 (a), especially 5 or 4 (b). Of these 5 or less transmitting intervals, which are mutually non-overlapping, at least one transmissive interval exhibits an arrangement in the range of two color perceptions of blue (B), green (G) or red (R). The other transmitting intervals are arranged in the frequency spectrum such that they are arranged in the region of a single color perception, ie blue or green or red. These transmissive intervals for color perception preferably exhibit a bandwidth in the range of about 30 nm or noticeably below that, allowing for secure demarcation and placement within a range of color perception, and for safe separation from the other transmissive intervals. For this purpose, the transmitting intervals are arranged so that they have a sufficient distance from each other.

By virtue of this particular arrangement and design of the transmissive regions, it is possible to reduce the number of edges, i. to reduce the number of edges of the transmitting intervals and thus significantly reduce the cost of producing the filters, which are typically interference filters, without incurring a significant impairment of the color rendering option.

As an additional effect, the formation of the stereo projector can be simplified with a corresponding embodiment of the filter according to the invention for the inventive method or the stereo projection system, since by this training, a reduction of very high frame rates for a realized example as Dreichip DLP projector projector with replaceable Separation of the two perspective partial images is possible. This is with a noticeable reduction the burden on the imaging units, and thus an improvement in the life of the projector.

The formation of at least one transmitting interval in such a way that it is permeable in the region of two color perceptions makes it possible to increase the image brightness available for projection and image reproduction, and thereby to create the possibility of using suitable electronic color correction circuits To provide reliable and natural color composition of the reproduced perspective partial images and thus of the three-dimensionally perceivable stereo image.

It has been proven that the interference filters of the lenses are not identical to those of the interference filter units of the image-forming components of the system but rather structurally different and thus at most only in accordance with each other form. As a result, differences in the manufacturing quality or in the design can be purposefully used or used to ensure that certain advantageous projection or presentation situations can be achieved. By way of example, a combination of the filters in the stereo projector and in the spectacle (s), which differ from one another in the corresponding filters by a permutation of individual limited transmitting intervals, reduce the frame rate of the stereoprojector without a unpleasant flickering of the stereo images is perceptible. In this case, the stereoprojection system described below has been found to be particularly preferred. This shows interference filters of the interference filter units of the stereo projector with a permutation, limited transmissive intervals of the interference filters in the blue or green or red color perception area and at least one stereo ghost showing interference filters equipped with 6 non-permuted transmissive intervals in the prior art. In the context of the mentioned permutation, an exchange of two transmitting intervals between corresponding interference filters (right side opposite left side and right perspective partial image opposite left perspective partial image) within a color, that is within a color perception, is carried out, wherein additionally at least one merger of two adjacent, transmitting intervals to a common transmissive interval that extends over two color perception areas. Thus, the sum of the transmitted spectral intervals in the interference filter of the stereo projector is reduced, for example, from 6 to 5.

According to the invention, an exchange of the assigned color image data to be displayed is now carried out in accordance with the permutation of the transmitting intervals.

If, for example, a permutation of the red transmitting intervals R 1 and R 2, ie their exchange with the subsequent merging of the adjacent interval G 2 with R 1, then now the image information, that is the color image data for the projection by means of R 2 no longer means of the first interference filter unit but made by means of the second interference filter unit. This leads to a temporal shift in the representation of this "permuted" color image data, since the information obtained with the help of the respective perspective partial images without permutation created complete and always individually presented in an alternating order, whereas due to the permutation this is repealed. Due to the permutation, the temporal separation of the reproduction of the two perspective partial images (left and right) is canceled according to the invention. As a result, it is possible to fill in the gaps between the representation of the left perspective partial image, which results from the fact that the other, right perspective partial image is displayed in the gap, with images or image information in the permuted color.

This makes it possible according to the invention to prevent or reduce an unpleasant flickering of the projected stereo images. This improved design of the stereo projection system makes it possible to reduce the undesirably high frame rate of the stereo projector, which places a significant burden on the components of the stereo projector, thereby increasing the lifetime of the components of the projector.

Alternatively or cumulatively, it is also possible according to the invention to increase the number of pixels shown and thus the resolution, without this resulting in an unpleasant flickering of the stereo image representation.

In a corresponding inventive manner, it has been proven not to make the permutation in the interference filter units of the stereo projector, but in the interference filters of the lenses of the stereo glasses. This leads to the corresponding advantages, as they are achieved in the aforementioned embodiment of the invention. It has proved to be particularly advantageous to choose the reduced number of transmitting intervals for the two perspective partial images equal to 5, which results in that one perspective partial image is formed by two transmittent intervals, whereas the other partial perspective image is formed by three transmitting intervals of which one each is arranged in the region of blue, green and red color perception and preferably shows a bandwidth of typically less than 30 nm, in particular in the range of 20 to 25 nm.

Furthermore, it has been proven that the outer blue transmitting interval or the outer red transmitting interval as an upwardly or downwardly open interval, so typically beyond the visible through the human area or as broad with a little steeply sloping edge trained, transmittie - To realize rendes interval and thereby in turn provide for increased brightness. With this additional brightness, it is possible to achieve improved color perception through electronic measures.

The filter with the two transmissive areas, one of which comprises two color perception areas, namely red and green or blue and green, shows a reduced number of transmissive intervals, which accordingly have a significantly reduced number of edges, ie edges for the transmission areas of the transmitting areas Intervals, ie 4 pieces instead of 6 pieces in the prior art, shows. This reduction provides a significant simplification of the filter characteristics and allows the cost-effective and simpler design of the filter without this, which is surprising, has a significant effect on the quality of color reproduction. The steepness of the flanks of the Transmitting intervals represents a quality-determining measure of the filter in particular the interference filter, which in turn has a massive impact on the cost of the filter.

By this inventive design of the filter in particular the interference filter with fewer edges on the one hand by the inventive reduction of the number of transmitting intervals and on the other by the ability to provide open transmitting intervals in the edge region of the outer color perception areas, in particular with gently sloping edges in the outer region of these transmitting intervals, In addition, it is possible to significantly reduce the outlay for the filters, in particular for the interference filter, for these methods for producing an optically perceptible, three-dimensional image reproduction or for a stereo projection system.

It has proven particularly advantageous to design the filters, which are realized in particular as Fabri-Perrot interference filters, in such a way that they show a total of 4 transmitting intervals for the two perspective partial images. In this case, each filter for a perspective partial image shows a transmitting interval, which is arranged in the region of two color perceptions. These transmissive intervals comprise either the two color perceptions blue and green or the two color perceptions green and red. These transmissive intervals show a mean bandwidth of more than 30 nm. The other two transmitting intervals, one each of the two perspective partial images and thus one each Filter is assigned to a single Color perception namely blue or red assigned. In this case, the transmitting intervals are selected such that each filter or each perspective partial image receives color information for each color perception region red, blue, green.

Here, too, the outer transmissive intervals may be formed as open transmitting intervals. As a result, the number of edges or the number of edges on the one hand by the reduction of the number of intervals and on the other hand by the provision of open edge intervals further reduce and thereby create the possibility of simpler, cheaper filters, which in particular as a Fabri-Perrot filter are realized to use to create a stereo projection system according to the invention.

By providing this compared to the prior art widened bandwidth, which at least partially have more than 30 nm bandwidth and at least partially cover two color perception areas, it is possible to project very bright stereo projection images and thus three-dimensionally perceptible images without the quality of the color reproduction considerably affected becomes. Incidentally, this embodiment of the transmitting intervals has created the possibility of generating a particularly natural color perception by means of electronic color correction circuits.

According to a particularly preferred embodiment of the projection system according to the invention, the stereo glasses, of which different numbers are provided depending on the number of persons who want to use the stereo projection system at the same time, are provided with spectacle lenses which show interference filters. The optical properties of the lenses are chosen so that they preferably structurally differ from the corresponding interference filter units in the optereoprojektor. As a result, an optimal use of the projected image information and brightness of the images is achieved so that the user or users of the stereo projection system according to the invention can perceive each for themselves and thus together very pleasant and bright and colourfast stereoperspective images.

In other words, the invention is based on a method for generating an optically three-dimensionally perceptible image reproduction according to the known interference filter technology or a known corresponding Stereoprojektionssysteπi characterized in that the color filter for image generation, ie in a stereo projector or in a stereo display, etc., compared to those color filters for image acquisition by means of the stereo glasses structurally different formed by different numbers of transmitting intervals are selected. The number a of the one number is selected to be 6, in particular, as in the prior art, while the other number b is chosen to be smaller than a and thus in particular smaller than 6.

The reduction of the intervals is achieved, for example, by swapping (permuting) two narrow transmitting intervals in the range of a color perception blue (B), green (G) or red (R) right-left and then one of them with an adjacent transmitting interval is connected to a single wide interval, whereby a single is created in two color perceptions blue (B), green (G) or red (R) ersteeckendes transmitting interval. This results in transmissive intervals for the color filters for image generation or for the stereo control Ie, which are formed substantially identical, and other transmitting intervals, which differ structurally and are therefore only designed accordingly.

According to the invention, the image data associated with the pairwise right-left (permutated) intervals are additionally reversed right-left during image generation, so that a secure and reliable separation of the stereoscopic perspective fields for the left and right eyes is possible and also the flickering tendency the system is reduced in the sequential playback of the individual color image data. In addition, the system of the invention shows a simple, robust and inexpensive construction.

The invention will be described in more detail below, reference being made to the drawings and the reference numerals therein.

The invention is not limited to the embodiments shown by way of example in the drawings.

Showing:

1 a is a schematic representation of a stereoprojection system according to the invention,

1 b is a schematic representation of another stereoprojection system according to the invention,

Fig. 2 spectral transmission ranges of the orthogonal filter in conventional interference filter technology according to the prior art

3 shows an exemplary spectral distribution of the transmitting intervals of two interference filters according to the invention 4 shows a further exemplary spectral distribution of the transmitting intervals of two inventive interference filters

5 shows a further exemplary spectral distribution of the transmitting intervals of two interference filters according to the invention

Fig. 6 a shows a spectral distribution of the prior art transmitting intervals for the stereo glasses and the stereo projector b, a temporal sequence of the projected and perceived color image data according to the prior art for the stereo glasses and the stereo projector

7 shows a spectral distribution of the transmitting intervals according to an exemplary stereo projection system according to the invention for a stereo eyepiece and a stereo projector

8 shows a temporal sequence of the projected and perceived color image data of an exemplary stereo projection system according to the invention

9 shows a further spectral distribution of the transmitting intervals according to an exemplary stereo projection system according to the invention for a stereo eyepiece and a stereo projector

1 a shows the key component of the stereo projection system according to the invention for producing an optically perceptible three-dimensional image reproduction, namely the stereo projector 10. This stereo projector 10 projects the image data supplied thereto onto a screen 20 by converting the stereo image data in the stereo projector 10 into perspective partial images and onto the screen 20 be projected. The two separate perspective partial images, which together represent the stereo image and represent a three-dimensional perceptible image. This is perceived by the viewers, who are equipped with a stereo goggles 30. In this case, the two perspective partial images are separated from each other and differentiated from each other supplied to the left or the right eye of the beholder with the help of the stereo glasses 30 and the lenses located therein. The viewer thus perceives the two stereoscopically differentiated perspective partial images and thus has the perception of a three-dimensional structure.

The stereo projector 10 shows in a housing all the important components for the projection of perspective partial images and an integrated color correction circuit 15. For each perspective partial image, a light source 11 is realized in the form of a short arc lamp, the emitted light of an imaging unit 12, which is implemented as an LCD chip supplied becomes. The imaging unit 12 is controlled with the stereo image data respectively with the perspective partial image data assigned to it so that the desired perspective partial image is generated from the broadband light supplied to it by the light source 11 and fed to the projection optics 14 and subsequently to the screen 20.

The stereo projector 10 furthermore has an additional interference filter unit 13a or 13b for each perspective partial image. The arrangement of the interference filter unit 13a between the light source 11 and the imaging unit 12 provides a very robust and compact unit, while the alternative arrangement of the interference filter unit 13b in front of the projection optics 14 is a very flexible and less robust and compact arrangement. The color correction circuit 15 integrated in the stereo projector 10 is connected to the image data source, which is not shown, for the stereo image data, and corrects the stereo image data supplied thereto, particularly in terms of color and brightness, by selecting the transmitting intervals (passages ) of the interference filter units 13a, 13b are reduced or substantially canceled. In addition, the color correction circuit ensures that the differences in brightness and the other color distortions due to the different transmission properties due to the different transmitting intervals of the different interference filter units 13a or 13b are largely or completely corrected for the different perspective partial images. Disturbances due to the projection optics 14 or the light sources 11 used are additionally corrected. This makes it possible to project a very balanced, color-neutral stereo image, which allows the viewer a very pleasant viewing and thus allows a three-dimensional perception reliably and in a pleasant way.

The interference filter units 13a, 13b are Fabrice-Perrot interference filters each showing a filter characteristic formed orthogonal to each other. 2 shows a known filter characteristic of the two interference filter units once for the left eye and thus for the one perspective partial image and once for the right eye and thus for the other perspective partial image, which are orthogonal to one another and thus do not show any mutual overlap , The illustrated transmissive intervals B1, B2, G1, G2, R1 and R2 show no overlap and are spaced apart so that the two perspective partial images are reliably separated from one another. can be given. The individual transmitting intervals Bl, B2, Gl, G2, R1 and R2 are realized as very narrow-band transmitting intervals with a bandwidth of about 20 nm half-width, of which the two intervals Bl and B2 in the blue color perception area, the two intervals Gl and G2 are arranged in the green color perception area and the two intervals Rl and R2 in the red color perception area of the human eye. The interval R2 represents an outer and an open transmitting interval which has a steep edge and has a much less steep, not shown edge, edge.

The one interference filter unit with the transmitting intervals Bl, Gl and Rl shows 6 distinct, steep edges, whereas the other interference filter unit with the transmitting intervals B2, G2 and R2 shows 5 steep, distinct edges and flanks, respectively. These steep flanks are very difficult to manufacture and are responsible for the significant cost of this interference filter unit. The arrangement of the three transmitting, narrow-band intervals, the possibility is given to project a pretty colorful and pleasant stereo image.

FIG. 1 b shows another stereo projector 10 according to the invention at different projection times T 1 or T 2. The stereo projector 10 shows in a housing all the important components for the projection of perspective partial images and an integrated color correction circuit 15. The single light source 11 is realized in the form of a Kurzbogenlanape whose emitted light of a single imaging unit 12, which is implemented as a DMS chip, respectively , The imaging unit 12 is provided with the stereo image data, respectively, with the perspective partial image data sequentially assigned thereto so controlled that the desired perspective partial image generated from the supplied broadband light of the light source 11 and the projection optics 14 and then the associated screen 20 is supplied.

The stereo projector 10 also has, for each perspective partial image, an exchangeable filter as interference filter unit 13c with two different mutually orthogonal interference filters, which are alternately inserted into the beam path depending on the representation of one or the other perspective partial image. The arrangement of the interference filter unit 13c as a replaceable filter between the light source 11 and the imaging unit 12 provides a very robust and compact and inexpensive unit.

FIG. 3 shows a filter characteristic according to the invention of the two interference filter units 13a, 13b, in which a total of less than 6 transmitting intervals, namely only 5 transmitting intervals L21, L22, L23, R21 and R22, are realized. In this case, the transmitting intervals L21, L22 and R21 are implemented as narrow-band, transmitting intervals in the blue perception region (L21 and R21) and in the green perception region (L22). These show a bandwidth of about 25 nm. L21 shows a mean half width in the range of 425 to 450 nm, R21 a bandwidth of 450 to 485 nm as the half width and in the green perception range, the transmitting interval L22 shows a half width of 500 to 525 nm.

However, the transmitting interval R22 is not located in a single color perception area of the eye. Rather, it includes portions of the green and red sensing regions and extends over a wavelength range of 535 to 626 nm. Separated from and spaced apart, the transmissive interval extends L23 from a wavelength of 635 to over 690 nm and represents an open interval.

The two transmissive intervals R21 and R22 are assigned to the one perspective partial image for the right eye, while the three other transmitting intervals L21, L22 and L23 are assigned to the other perspective partial image and thus to the left eye.

This filter characteristic shows a reduced number of transmitting intervals and, moreover, a reduced number of steep edges or flanks. Here, the number of transmitting intervals is reduced to 5 in total, whereas the number of steep edges is reduced to 9 in total. Thus, on the one hand the cost of implementing this filter characteristic is significantly reduced, without this having a significant impact on the color rendering quality. On the contrary, the increased brightness due to the broad design of the transmitting interval R22 offers the possibility of achieving increased brightness, which makes it possible to use a color correction circuit to a particular extent, thereby enabling an additional improvement of the color characteristics.

Starting from the color characteristic according to the prior art with the 6 transmitting intervals, the color characteristic according to the invention is given by a kind of channel permutation, namely by a kind of exchange of the interval R 1 from the one perspective partial image into the other perspective partial image and the connection of R 1 to the interval G 2, whereas in return the transmitting interval R2 is assigned to the other perspective partial image. In a corresponding manner, the filter characteristic of FIG. 4 has arisen from the filter characteristic of FIG. 2, in which case the interval B 1 has been assigned to the other perspective partial image and, in turn, the interval B 2 has been connected to the interval G 1 for the sub-image 1. This makes it possible to provide a filter characteristic which has been formed in a manner corresponding to the filter characteristic of FIG. 3 and shows the corresponding comparable advantages. In contrast to the aforementioned filter characteristic, here the transmitting interval LIII extends over the two color perception ranges blue and green. Whereas the other intervals are always only in one color perception area. The interval LIl shows a bandwidth of 460 to 525 nm and the interval RlI a bandwidth of 420 to 450 nm, while R12 shows a bandwidth of 535 to 565 nm and the interval L12 a bandwidth of 595 to 626 nm. Interval R13 is provided as an open interval with a larger bandwidth extending beyond 635 to over 690 nm. This filter characteristic is characterized by a reduction of the intervals and beyond by a significant reduction of the steep edges, which significantly reduces the effort to realize this filter characteristic.

In addition, FIG. 5 shows a further filter characteristic according to the invention, namely one with only four transmitting intervals, two of which extend over two color perception areas and the other two extend exclusively over a single detection area or are arranged therein. The left eye interval L31 and the right eye interval R32 are associated with only one color perception area, namely, the blue color perception area and the red color perception area, respectively. The interval L31 extends from below 420 to about 450 nm and R32 in the red color perception range of 635 to 50 nm. over 690 ran. R32 represents a so-called open interval with a flat edge or a flat top edge in the region above 690 nm. The other two intervals, which extend over two color perception areas, show an increased bandwidth. This bandwidth is significantly greater than 30 nm. Interval L32 covers both the green and red color perception areas and ranges in bandwidth from about 535 to 626 nm, whereas R31 extends beyond the blue and green color perception area and the 460 area to 525 nm. This design of the filter characteristic of the two interference filters an orthogonal filter characteristic is given, which is characterized by a significantly reduced number of intervals, namely 4, and beyond a significantly reduced number of steep edges, namely a total of 7 is characterized, which is a very simple and very good filter characteristic to be produced. This filter characteristic is nevertheless able to allow a very pleasant color reproduction of the stereo projection system.

In Fig. 6a, the transmitting intervals of a stereo projector and an associated stereo eyeglasses according to the prior art are shown. The stereo eyeglasses 6 show narrow, limited transmitting intervals Bl *, Gl *, Rl * and B2 *, G2 *, R2 *. The interference filter units of the stereo projector also show 6 at the aforementioned intervals identical transmitting intervals Bl, Gl, Rl and B2, G2, R2. In this case, the xl intervals (x = B, G, R) are respectively assigned to the left perspective partial image and the "left" components of the stereo projector, while the x2 intervals are assigned to the "right" components x2 intervals are formed orthogonal. In Fig. 6b, the temporal order of the displayed, or perceptible image content of the individual perspective partial images according to the prior art is shown. This is generated, for example, by means of a stereo projection system according to FIG. 1b. The partial images projected and perceptible with the aid of the stereo projection system with the interference filters according to FIG. 6a are reproduced alternately.

First, the left perspective field image is reproduced with the image information Bl, Gl, Rl projected by means of the respective intervals. In this period, no image or image information and thus no color image data is projected from the right perspective partial image. Thus, no right perspective partial image is perceptible. Subsequently, the right perspective partial image with the color image data B2, G2, R2, which are projected by means of their respective intervals, is displayed, whereas in this period, the left perspective partial image is not displayed. Accordingly, only the right perspective partial image can be perceived by the right lens of the stereo glasses, whereas no information of the left perspective partial image can be perceived.

Subsequently, the representation of the other Perspektivteilbildes again and accordingly the interruption of the representation of the Perspektivteilbildes.

This alternating representation of the Perspektivteilbilder significant temporal gaps are given for the perception of each image for each eye, which, as soon as the time gaps are too long, lead to an unpleasant flicker. To prevent this, the frame rate of the stereo projector is high. This high frame rate leads to a considerable load on the components of the stereo projector. The- This strain leads to a reduced lifetime and leads to a considerably increased susceptibility of the stereo projector. This also applies to a filter change mechanism according to FIG. Ib. In order to overcome these disadvantages, very costly and expensive measures have to be taken.

FIG. 7 shows, according to FIG. 5, a spectral distribution of the interference filter spectra according to the invention for the interference filters of the interference filter units of the stereo projector or the interference filters of the spectacle lenses of the stereo glasses.

The characteristic of the interference filters of the spectacle lenses of the stereo projection goggles shows 6 narrow intervals according to the prior art, whereas the intervals of the interference filters of the stereo projector are structurally different according to the invention and show only four transmitting intervals. Here, the interference filter of the stereo projector for the left perspective partial image shows a narrow interval Bl *, whereas the other interval due to a permutation of Gl * with G2 * by connecting the intervals G2 * with the interval Rl * represents a relatively wide interval

In a corresponding manner, for the interference filter of the stereo projector for the right perspective partial image, a connected interval Gl * with B2 * has arisen, which is supplemented by the single, narrow interval R2 *. The connected intervals extend into two color perception areas. In this case, Bl and Bl * or R2 and R2 * are largely identical, while other intervals differ structurally and substantially and at most correspond.

In a corresponding manner to FIG. 8, a permutation of the color image data is also carried out in this arrangement according to the invention, so that according to the invention, the advantages mentioned below can be achieved accordingly.

FIG. 8 shows the chronological sequence of the reproduced and recordable stereo image information or color image data for the left eye or the right eye of a stereo project system according to the invention, wherein a stereo projector according to FIG. 1b is used.

The illustration in FIG. 8 is based on a spectral distribution of the transmitting intervals corresponding to FIG. 7 for the interference filter units in a stereo projector.

From a permutation of the intervals G1 to G2, the wide interval R31 formed between G1 and B2 and comprising two color perception ranges has emerged. The permuted interval G2 is combined with the interval R1 to the interval L32 and also comprises two color perception areas. By this permutation with two subsequent summaries, an arrangement is created which shows four transmissive intervals for the two interference filter units of the stereo projector. If, in addition, the color image data associated with the interval G2 are also permuted to the interval G1 and thus represented with the aid of the other interference filter unit, this leads to an alternating representation and thus possibility of perception of the color image data on the left eye or on the right Eye in which color image data for the green color perception region alternate with the color image data of the other color perception regions red and blue. This is due to the additional permutation of the color image data so that the left eye can only perceive information for the left eye, and similarly, this also applies to the right eye. It should be noted that according to the invention no permutation of the 6 intervals for the stereo glasses has taken place, whereby their optical properties correspond to the optical properties of the non-permuted interference filters of the interference filter units in the stereo projector. By the procedure described, it is possible to close the gaps in the reproduction for the respective eye from the prior art and thereby significantly limit the unwanted flicker.

On the color image data Rl, Bl follow with a short distance the color image data G2 and then with a corresponding short time interval turn the color image data Rl, Bl, Gl, etc. This applies to the left eye and, in a corresponding manner, this also applies to the right eye. Through this elimination of the long time intervals without pronounced negative light stimulus by a pronounced dark phase, a significant quality gain is achieved. This has a particularly advantageous effect that the negative aspect of the physiological delay of the perceptibility of images in this inventive solution is particularly disturbing, since the interruption of the brightness According to the invention of a very short time length and thus is not or only partially activated. As a result, the reproduced brightness can largely be detected physiologically, which is not possible in the prior art and is reflected in a reduced detected brightness. Thus, according to the invention, a subjectively brightly perceived stereo image is achieved.

This design of the stereo projection system also makes it possible to lower the frame rate without increasing the tendency to flicker or, if necessary, to increase the resolution of the stereo images to be displayed. Depending on the application, this can be done alternatively or in combination. Here, the relationship between the frame rate and the resolution is taken into account that the product of them represents the constant maximum bandwidth of the transmitted image data. Accordingly, for example, by decreasing the frame rate, the resolution can be increased.

The stereoprojection system described achieves a very comfortable and pleasant perception of stereo images, wherein the

Stereoprojektionssystem also characterized by long lifetime and comfortable and cost-effective implementation.

FIG. 9 shows another solution according to the invention for a stereo projection system. FIG. 9 shows the spectral distribution of the interference filter spectra for the interference filters of the interference filter units of the stereo projector or the interference filters of the spectacle lenses of the stereo glasses, corresponding to FIG. 6a. The characteristic of the intervals of the stereo projector shows 6 narrow intervals according to the prior art, whereas the interference filters of the lenses of the stereo projection goggles show only four transmissive intervals. In this case, the left lens shows a narrow interval Bl *, whereas the other interval is due to a permutation of Gl * with G2 * by connecting the intervals G2 * with the interval Rl *.

In the same way, a connected interval Gl * with B2 * was created for the right lens, which is supplemented by the single, narrow interval R2 *. The connected intervals extend into two color perception areas. In a corresponding manner to FIG. 8, a permutation of the color image data is also carried out in this arrangement according to the invention, so that the aforementioned advantages can be achieved accordingly.

In addition, the Produktiσns- and cost advantage affects here in particular extent, since a stereo projector with two interference filter units a larger number of stereo glasses with a reduced interval number can be assigned, resulting on the one hand to considerable cost advantages, on the other hand, but to noticeable quality benefits.

In addition, it is possible by the filter characteristics shown to reduce the high frame rates in the prior art, for example for Dreichip DLP projectors with interchangeable filters according to the invention and thereby the maximum number of To increase controllable pixels or reduce the susceptibility of these stereo projectors and thereby significantly increase the life and robustness of these stereo projection systems according to the invention.

Claims

claims

Method for generating an optically three-dimensionally perceptible image reproduction, whereby for each of the two perspective partial images (left or right) different specified regions of the visible spectrum are masked out by color filters, such that a plurality of limited spectral intervals in the region of color perception blue (B), Green (G) and red (R) are transmitted, wherein the position of the transmitting intervals for the two perspective fields is different, are used in the image generation and image acquisition by means of a stereo glasses color filter for the perspective fields, characterized in that that for the color filters for the image generation compared to those for image acquisition by means of the stereo goggles different numbers of transmitting intervals are selected, that the number a of the transmitting intervals for the two perspective partial images is selected in particular with a smaller than 6, where at least one transmissive interval for one of the perspective sub-images in the region of two color perceptions Blue (B), green (G) or red (R) is chosen to be transmissive, and that the number b of the transmitting intervals for the two perspective subpixels is on the other hand greater than a, in particular equal to 6 selected, that the transmitting filter and image filter the stereo glasses are formed substantially identical and others are formed accordingly, in the imaging or the stereo glasses individual transmittent intervals are reversed in pairs right-left and reduced by connecting to an adjacent interval, and that the pairwise right-left intervals exchanged associated image data are additionally reversed right-left in image generation.

2. A method for generating an optically three-dimensionally perceptible image reproduction according to claim 1, characterized in that the number b of the transmitting intervals (LI1, L12, RI1, R12, R13, L21, L22, L23, R21 , R22) is selected to be equal to 5 for the two perspective sub-images, that a transmissive interval (LII; R22) for one of the perspective partial images in the region of the two color perceptions blue (B) and green (G) or in the region of the two color perceptions green (G ) and red (R) is selected to be transmissive of a width greater than 30 nm.

3. A method for generating an optically three-dimensionally perceptible image reproduction according to claim 2, characterized in that the transmitting intervals (L12, RI1, R12, R13, L21, L22, L23, R21) in the region of a single color perception blue (B), green ( G) or red (R) have a width of about 30 nm or less than 30 nm.

4. A method for producing an optically three-dimensionally perceptible image reproduction according to claim 1, characterized in that the number b of the transmitting intervals (L31, L32, R31, R32) is selected to be 4 for the two perspective partial images for the color filters of image generation or image capture, in each case one transmitting interval (L32; R31) for one of the perspective partial images in the region of the two color perceptions blue (B) and green (G) or in the region of the two color perceptions green (G) and red (R) transmissive of a width of more than 30 nm is selected and that a respective transmitting interval (L31, R32) for one of the perspective partial images in the region of a single color perception blue (B) or red (R) are arranged.

5. A method for generating an optically three-dimensionally perceptible image reproduction according to one of the preceding claims, characterized in that at least one of the two outer transmitting intervals is formed as an open interval.

Stereoprojection system for generating an optically three-dimensionally perceptible image reproduction with a stereo projector (10, 46) which is suitable for projecting two perspective partial images (left or right) onto a screen, comprising at least one light source (11), with at least one imaging unit (12) for each perspective partial image, and with two orthogonal interference filter units (13a, 13b), through which different specified regions of the visible spectrum are masked, such that several limited spectral intervals in the range of color perception blue (B), green (G) and red (R) wherein the position of the transmitting intervals for the two perspective sub-images is different, characterized in that the color filters of the stereo projector are designed such that the number b of the transmitting intervals for the two perspective sub-images is less than 6 and at least one transmissive I ntervall for one of the perspective partial images in the range of two color perceptions blue (B), green (G) or red (R) is chosen to be transmissive,

at least one stereo eyeglass is provided, whose eyeglass lenses are essentially identical or correspond in their transmitting properties for the left and right eye of a viewer to those of the two orthogonal interference filter units and have at least 6 limited spectral intervals which are pairwise in the range of color perception blue (FIG. B), green (G) and red (R) are transmissive, the position of the transmitting intervals being different, that the left perspective image is formed by means of the color image data Rl, Gl, Bl and the right perspective image by means of the color image data R2, G2, B2 by means of the imaging unit of the stereo projector, wherein Rl and R2 are color image data with red color, Gl and G2 color image data with green color and Bl and B2 represent color image data in blue color,

that color image data of one color of the two perspective images are reversed in a pairwise right-left so that the reversed right color image data is displayed using the interference filter unit for the left perspective image and vice versa that the interference filter units of the stereo projector are designed so that at least a part of the reversed color image data in Transmitting and projecting the area of a transmitting interval in the range of two color perceptions,

and that the stereo projector is configured so that perspective images can be projected by alternately using the two interference filter units.

Stereoprojection system for generating an optically three-dimensionally perceptible image reproduction with a stereo projector (10, 46) which is suitable for projecting two perspective partial images (left or right) onto a screen, comprising at least one light source (11), with at least one imaging unit (12) for each perspective partial image, and with two orthogonal interference filter units (13a, 13b), through which different specified regions of the visible spectrum are masked, such that several limited spectral intervals in the range of color perception blue (B), green (G) and red (R) wherein the position of the transmitting intervals for the two perspective partial images is different, wherein at least one stereo eyeglasses is provided, the spectacle lenses correspond in their transmitting properties for the left and right eye of a viewer those of the two orthogonal interference filter units, characterized in that the number b of the transmitting intervals of the stereo glasses is chosen to be less than 6 for the two perspective sub-images, wherein at least one transmitting interval for one of the perspective sub-images in the range of two color perceptions blue (B), green (G) or red (R) is chosen to be transmissive is.

in that the stereo projector has interference filter units whose transmitting properties for the left and right perspective images correspond to those of the two spectacle glasses of the stereo glasses and have at least 6 (a) limited spectral intervals, the in pairs in the range of color perception, blue (B), green (G) and red (R) are transmissive, the position of these transmitting intervals being different,

that the left perspective image is formed by means of the color image data Rl, Gl, Bl and the right perspective image by means of the color image data R2, G2, B2 by means of the imaging unit of the stereo projector, wherein Rl and R2 are color image data with red color, Gl and G2 color image data with green color and Bl and B2 represent color image data in blue color,

that color image data of one color of the two perspective images are reversed in pairs right-left so that the reversed right color image data is displayed and projected by means of the interference filter unit of the stereo projector for the left perspective image, and vice versa,

the interference filters of the spectacle lenses are selected so that at least a part of the exchanged color image data is transmitted in the region of a transmitting interval in the region of two color perceptions.

and that the stereo projector is designed such that perspective images can be projected using the two interference filter units alternately.

8. Stereoprojektionssystem for generating an optically three-dimensionally perceptible image reproduction, according to claim 6 or 7, characterized in that the two orthogonal interference filter units (13a, 13b) of the stereo projector or the stereo eyeglasses are formed so that the number b of the transmitting intervals (LIl, L12 , RIl, R12, R13, L21, L22, L23, R21, R22) is selected for the two perspective partial images equal to 5, that a transmissive intervals (LlI; R22) for one of the perspective partial images in the range of two color perceptions blue (B) and green (G) or in the region of the two color perceptions green (G) and red (R) is selected to be transmissive with a width of more than 30 nm and that the transmitting intervals (L12, RI1, R12, R13; L21, L22, L23, R21) in the region of a single color perception, blue (B), green (G) or red (R) have a width of about 30 nm or less than 30 nm.

9. Stereoprojektionssystem for generating an optically three-dimensionally perceptible image reproduction, according to claim 6 or 7, characterized in that the two orthogonal

Interference filter units (13a, 13b) of

Stereoprojektors or stereo glasses are formed so that the number b of the transmitting intervals (L31,

L32, R31, R32) for the two perspective partial images

4 is selected, that in each case one transmitting interval (L32, R31) for one of the perspective partial images in the region of the two

Color Perceptions Blue (B) and Green (G) or in the range of the two color perceptions green (G) and red (R) is selected to be transmissive of a width of over 30 ran and that one transmitting interval (L31, R32) for each of the perspective sub-images in the region of a single color perception blue (B) or red (R ) are arranged.