Patent ID: 8963063
Filing Date: 2015-02-24
Classification: H04N

Abstract:
1. A system for subtracting pixel values, the system comprising: at least one first photo-sensitive pixels, the at least one first photo-sensitive pixel outputting a charge to a common charge-sharing line; at least one second photo-sensitive pixel, the at least one second photo-sensitive pixel outputting a charge to the common charge-sharing line, the charge output by each second photo-sensitive pixel effectively being of opposite polarity to the charge output by each first photo-sensitive pixel, such that an accumulated charge present on the common charge-sharing line is a difference between the charge output by the at least one first photo-sensitive pixel and the charge output by the at least one second photo-sensitive pixel; and circuitry, in electrical communication with the charge-sharing line, configured to produce an output signal related to the accumulated charge present on the charge-sharing line.