A distance measuring apparatus which can accurately measure the distance to an object and keep track of the object. In the apparatus, a pair of image-pickup optical systems pick up an object. A window including the object is set in an image picked up by one of the image-pickup optical systems. The distance...http://www.google.de/patents/US5218414?utm_source=gb-gplus-sharePatent US5218414 - Distance measuring apparatus utilizing two-dimensional image
