Patent ID: 7599574

Claim:
A signal processing method for processing a signal obtained by performing orthogonal transform on an inputted video signal corresponding to a plurality of pixels, said signal processing method comprising: a storing process for measuring brightness of each pixel of a display device while supplying a test video signal having a uniform luminance level to the display device, performing orthogonal transform equivalent to the orthogonal transform performed on the inputted video signal on the measured values obtained by measuring non-uniformity of display characteristics of the display device, and storing the orthogonally transformed measured values as correction values; a correction process for correcting the orthogonally transformed signal, by using the stored correction values; and an inverse orthogonal transform process for performing inverse orthogonal transform on the signal corrected in said correction process and thereby obtaining a corrected video signal, wherein in the correction process a DC component of the correction values is divided by a DC component of the orthogonally transformed signal to calculate a coefficient and an AC component of the correction values is multiplied by the calculated coefficient, and wherein the correction process corrects the orthogonally transformed signal by subtracting the multiplied value from the orthogonally transformed signal.