An image processing method is provided for obtaining a non-deteriorated pixel value as a pixel value of a pixel free from a defect such as a scar or dust from non-visible beam image information obtained from a defective recording medium having the scar or dust. The method includes the steps of: obtaining a calculated value: Y for each pair of samples of corresponding pixels of visible beam image information and said non-visible beam image information both obtained from the recording medium, Y=Mean[IR]-IR+X, where, Mean [IR] is an average pixel value of the non-visible beam image information, IR is a pixel value of the non-visible beam image information and X is a pixel value of the visible beam image information; obtaining a regression equation with the pixel value: X of the visible beam image information as an independent variable and the calculated value: Y as a dependent variable; deriving the non-deteriorated image pixel value from the regression equation; and obtaining a corrected pixel value: Z for a deteriorated pixel in the visible beam image information by a following equation; corrected pixel value: Z=CF-IR+X, where CF is the non-deteriorated pixel value, IR is the pixel value of the non-visible beam image information and X is the pixel value of the visible beam image information.