Patent ID: 8320703

Claim:
A method of executing image processing to correct a non-uniform perceived resolution caused by image distortion correction with different magnification ratios in an image, thereby achieving a uniform perceived resolution over the image, the method comprising: adding a variable-frequency-band aperture compensation signal to a mainline signal at a stage prior to the image distortion correction, the variable-frequency-band aperture compensation signal corresponding to a frequency band in which an aperture compensation signal is lost by the image distortion correction; calculating distortion correcting data when a partial conversion of magnification ratio is applied to the image caused by the image distortion correction; and executing image processing on the image at a stage subsequent to the image distortion correction, using the aperture compensation signal generated on the basis of a step-valued aperture compensation gain calculated using the calculated distortion correcting data used in the image distortion correction, wherein, the step of adding a variable-frequency-band aperture compensation signal comprises calculating coefficients for shifting the frequency band of the aperture compensation signal on the basis of the distortion correcting data used in the image distortion correction.