Patent ID: 8481907

Claim:
A system comprising: an array of pixels; and a controller coupled to the array of pixels, the controller configured to: acquire a first family of images, wherein each image in the first family of images is a first image based on setting a reset voltage of each pixel in the array to a first voltage; acquire a second family of images, wherein each image in the second family of images is a second image based on setting only those pixels in a subset of the array to a second voltage, the first voltage being different from the second voltage, the subset being less than an entirety of pixels in the array of pixels, and wherein each image in the second family of images is based on a different subset of pixels in the array; and form a family of difference images, wherein each difference image in the family of difference images is formed based on a difference between one image in the first family of images and one image in the second family of images.