Patent ID: 8537240
Filing Date: 2013-09-17
Classification: H04N

Abstract:
1. A method for correcting white balance in a captured digital image, comprising the steps of: storing raw sensor data representative of the captured digital image in a memory, the raw sensor data collected by an imaging sensor array; normalizing the raw sensor data by applying illuminant-independent shading and vignetting correction to the raw sensor data, including applying a spatially-varying color-correction matrix to the raw sensor data; applying a plurality of illuminant-dependent shading and vignetting correction gain masks to the raw sensor data, each illuminant-dependent shading and vignetting correction gain mask including a spatially-varying gain mask for a respective color channel of the imaging sensor array; comparing the illuminant-dependent shading and vignetting correction result with the illuminant-independent shading and vignetting correction result; and selecting and applying the illuminant-dependent shading and vignetting correction gain mask that best approximates the normalized raw sensor data.