In each photosensitive cell, a photodiode 101, a transfer gate 102, a floating diffusion layer section 103, an amplifier transistor 104, and a reset transistor 105 are formed in one active region surrounded by a device isolation region. When the image is captured, the effect of relative motion between the camera and the subject is that it transforms the true image into a blurred image according to a 2-dimensional transfer function. The metrics are selected based on the performance of an application utilizing the cache.