US Patent 7812881 Imaging device, camera and image processing method

An imaging device includes an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels, a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to an image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system, and an estimating circuit that estimates the image output at the focus detection pixel based upon the conversion coefficient and the output from the focus detection pixel.