Patent ID: 9143709
Filing Date: 2015-09-22
Classification: H04N

Abstract:
1. A system of non-uniformity correction (NUC) for a pixel in an imaging array comprising: a lens assembly; an analog to digital converter; an imaging array, coupled to the analog to digital converter, for providing digital data pixel intensity values in response to a level of the light being received via the lens assembly; a storage module for storing: (a) a first gain coefficient for correcting a gain error of the pixel and (b) multiple damping factors, including a first damping factor, for adjusting the first gain coefficient, in response to multiple respective light levels that the pixel senses during operation, and a NUC corrector module, coupled to the analog to digital converter, said NUC corrector module comprising a subtractor, a first multiplier, a second multiplier and an adder of the NUC corrector module, the NUC corrector module configured to: receive a first intensity value as digital data from the analog to digital converter of a pixel in response to a first light level, extract the first gain coefficient and a first damping factor from the storage module, and correct the first intensity digital data value of the pixel wherein: the subtractor reduces a value of 1 by the first gain coefficient to provide a reduced value; the first multiplier multiplies the first damping factor by the reduced value to provide a multiplied value; the adder either adds or subtracts the multiplied value from the value of 1 to provide a corrected gain of the pixel; and a second multiplier multiplying an offset adjustment value by the corrected gain of the pixel to provide a final output data value of the pixel.