Patent ID: 7778483

Claim:
A computer implemented digital image processing method, comprising: extracting chromatic information of a Bayer type image taken by an image taking device and related to a human subject; sub-sampling the Bayer type image according to G*=(G 1 +G 2 )/2, wherein G 1 and G 2 are first and second green channels of the Bayer type image to produce an RGB image; constructing a chrominance slicing histogram of the RGB image using normalized channels r and g of the type: r=R /( R+G*+B ) g=G */( R+G*+B ), R, G and B being red, green and blue values of each pixel of the RGB image; detecting visually interesting regions in the RGB image by recognizing areas corresponding to skin of the subject using the chrominance slicing histogram, wherein the recognized areas are the visually interesting regions; and correcting an exposure of the Bayer type image or the RGB image by normalizing a grey scale of the Bayer type image or the RGB image based on said visually interesting regions.