This invention is directed to a method and apparatus for determining the level of ambient light impinging on a selected number of pixels in an imaging array where each pixel includes a photodiode. The ambient light may be determined by resetting the pixels in the array and by detecting current flow through...http://www.google.com/patents/US6469289?utm_source=gb-gplus-sharePatent US6469289 - Ambient light detection technique for an imaging array
