Patent ID: 7123293

Claim:
An image processing method of carrying out image processing on a digital image signal, the image processing method comprising: extracting a characteristic value representing a characteristic of an image sensing device from digital image signals of a plurality of images of subjects photographed by the image sensing device; and carrying out image processing according to the characteristic value on the digital image signals; wherein the characteristic value, when each of the digital image signals is composed of RGB color signals, is a total average of averages of the digital image signals and the image processing converts RGB color signals in a digital image signal representing an image of a gray subject to be equalized, based on the total average; wherein the image processing is carried out by weighting the averages by using predetermined weight coefficients; wherein each of the digital image signals is stored as an image file; and wherein R′=R+k1(Gave−Rave)+k2(Gi−Bi), G′=G, B′=B+k1(Gave−Bave)+k2(Gi−Bi), where R, G and B are the ROB color signals, Ri, Gi and Bi are averages of the digital image signals, Rave, Gave and Bave are total averages of the averages of the digital image signals, k1 and k2 are the predetermined weight coefficients, and R′, G′ and B′ are converted R, G and B signals.