An optical sensor device has an illuminating light source and an image sensor. The image sensor captures a sequence of images under exposure of light from the light source. A controller in the optical sensor device has a control output and generates an exposure time control signal on the control output....http://www.google.com/patents/US20030189664?utm_source=gb-gplus-sharePatent US20030189664 - Optical sensor device and a method of controlling its exposure time
