A color image sensor includes an array of pixels arranged in a plurality of pixel groups, each
pixel group including a floating diffusion that is shared by four pixels disposed in a 2× 2
arrangement. Each of said four pixels includes a photodetector and a color filter superposed
over the photodetector, wherein a first pair of said four pixels include green color, and a
second pair of said four pixels includes either red or blue color filters. A control circuit
controls the pixel groups such that discrete image information is generated from each pixel …