Signal processing apparatus, signal processing method, correction value generation apparatus, correction value generation method, and display apparatus manufacturing method

A signal processing apparatus comprising:

• an orthogonal transform device for performing orthogonal transform on a video signal corresponding to a plurality of pixels;
• a storage device for storing correction values obtained by performing orthogonal transform equivalent to the orthogonal transform of the orthogonal transform device on values obtained by measuring non-uniformity of display characteristics of a display device, the measurement of the non-uniformity is performed by measuring brightness of each pixel of the display device while supplying a test video signal having a uniform luminance level to the display device;
• a correction circuit for correcting the signal transformed by said orthogonal transform device by using correction values stored in said storage device;
• and
• an inverse orthogonal transform device for performing inverse orthogonal transform on the signal corrected by said correction circuit and thereby obtaining a corrected video signal,
• wherein the correction circuit includes a magnifier unit that divides a DC component of the correction values by a DC component of the orthogonally transformed signal to calculate a coefficient and multiplies an AC component of the correction values by the calculated coefficient, and
• wherein the correction circuit performs the correction of the orthogonally transformed signal by subtracting the multiplied value from the orthogonally transformed signal.