Patent ID: 8665350
Filing Date: 2014-03-04
Classification: H04N

Abstract:
1. A method of column Fixed Pattern Noise (FPN) correction, the method comprising: sampling a first optical black (OB) pixel level; calculating a difference between the first OB pixel level and a target level; storing the difference in a memory as an offset; setting a push size; sampling a next OB pixel level; reading the offset from memory; applying the offset to the next OB pixel level to form a modified next OB pixel level; determining whether the modified next OB pixel level is above or below the target level; if the modified next OB pixel level is above the target level, then the offset value is pushed down by a push-size and written to memory; if the modified next OB pixel is below the target level, then the offset value is pushed up by a push-size and written to memory; comparing the push-size with a minimum step size; if the push-size is larger than the minimum step size, then reducing the push-size; and determining whether a last OB pixel has been sampled, and if not, then repeating sampling a next OB pixel.