A subject selection device comprises a light source and an imaging device, such as a CCD, having a plurality of photo-diodes. The light source radiates a distance measuring light beam toward a plurality of objects. A reflected light beam, generated by the objects due to the distance measuring light beam,...http://www.google.com.mx/patents/US6765618?utm_source=gb-gplus-sharePatent US6765618 - Subject selection device and in-focus portion indicating device
