Patent ID: 8237824
Filing Date: 2012-08-07
Classification: H04N

Abstract:
1. A method of pixel correction, comprising the steps of: (A) calibrating a per-pixel correction model of a sensor at a plurality of different illumination levels, each of said different illumination levels occurring at a different one of a plurality of times, wherein (i) said sensor comprises a plurality of pixels, (ii) said per-pixel correction model defines a plurality of gains and a plurality of offsets and (iii) said calibrating includes (1) calculating a plurality of ideal values at each of said different illumination level by averaging groups of first pixel values captured by said sensor and (2) calculating said gains and said offsets based on a plurality of differences at each of said different illumination levels between said ideal values and said first pixel values; (B) generating a plurality of second pixel values from said sensor in response to an optical signal; and (C) generating a plurality of corrected values by applying said gains and said offsets to said second pixel values.