Patent ID: 8063949
Filing Date: 2011-11-22
Classification: H04N

Abstract:
1. An activity-based system for reducing Gr-Gb gain imbalance, comprising: a sensor configured to provide an input Bayer pattern array containing amplitudes corresponding to Gr and Gb cells; and a processor coupled to said sensor and configured to compute for at least some of said Gr and Gb cells: use said green precompensation factors, said averages for said pluralities of adjacent, same-type cells and said averages for said pluralities of adjacent, opposite-type cells to form an output Bayer pattern in which said Gr-Gb gain imbalance is reduced, wherein said green precompensation factors are further based on a piecewise linear transfer function which is wherein Gract is the local G r activity and G act =|Σ 0≦i≦8 w i G i | and wherein ming is a minimum green amplitude, maxg is a maximum green amplitude, Thr is a threshold and S is a slope.