Patent ID: 8106982

Claim:
An image sensor for an electronic imaging device, the image sensor including an array of pixel detectors, each pixel detector including: a. a photosensor device which detects incident light and has a photosensor output for a photosensor signal that represents a time integral of a detected light intensity; b. a signal generator device which generates a reference signal V s that varies according to a predetermined non-linear function; c. a transistor switch having a first input connected to receive the photosensor signal, a second input comprising a gate connected to receive the reference signal, and an outlet for an output signal, wherein the transistor switch compares the photosensor signal and the reference signal and determines a capture moment from the comparison; and d. an output device that is connected to the outlet of the transistor switch and arranged to capture an output signal at the capture moment, wherein said output signal represents a logarithm of the integrated light intensity.