Patent ID: 7889245
Filing Date: 2011-02-15
Classification: H04N

Abstract:
1. A method for automatic white balancing of a full-color input image, the method comprising the acts of using a processor to: select pixels of the input image according to one or more predetermined criteria; determine global gain values for R and B components of the input image using the selected pixels; determine local gain values for the R and B components of each individual pixel of the input image based on characteristics of each individual pixel; determine a final gain value for the R and B components of each individual pixel of the input image based on contributions of the local and global gain values; and produce a white-balanced output image by adjusting the R and B components of each pixel in the input image using the corresponding final gain value; and wherein producing a white-balanced output image by adjusting the R and B components of each pixel in the input image using the corresponding final gain value comprises producing a white-balanced output image Y made up of pixels y where: ƒ(•) denotes an adjustment operation and g(•) denotes a gain formulation: x K K r=1, 2, . . . , K k=1, 2, 3 correspond to the R, G, and B components of a pixel, respectively; η is the threshold; Φ Φ