Patent ID: 8223227
Filing Date: 2012-07-17
Classification: H04N

Abstract:
1. An apparatus comprising: a pixel array comprising a plurality of light-sensitive pixels configured to be exposed to light to capture an electronic image; readout circuitry arranged to: obtain a first dark-current error associated with first light-intensity values read from a first pixel group; subsequently read out light-intensity values from an intermediate pixel group in the pixel array to capture light-intensity values for the image; and subsequently obtain a second repeat dark-current error associated with second light-intensity values read from the first pixel group, the first pixel group being spaced apart from the intermediate pixel group in the pixel array, and each pixel group comprising one or more pixels; wherein the apparatus comprises noise-compensation circuitry configured to: compensate for dark current in the pixels of the intermediate pixel group of the pixel array by interpolating the first and second dark-current errors to calculate one or more dark-current errors for the intermediate pixel group; and subtract the dark-current error from the light-intensity value of a pixel of the intermediate pixel group to obtain a noise-compensated light-intensity value for said pixel.