METHOD AND PROGRAM FOR IMAGE SHARPENING PROCESSING, RECORDING MEDIUM WHERE THE IMAGE SHARPENING PROCESSING PROGRAM IS RECORDED, AND IMAGE OUTPUT DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide an image sharpening processing method of performing more accurate sharpening processing for any image when the sharpening processing uses ICA. PSOLUTION: Histogram conversion processing for converting gradation values of respective pixels of digital image data is carried out so that frequency distributions of respective gradations of the inputted digital data become nearly uniform over all the gradations. Then the image is sharpened by analyzing independent components of the image data after the histogram conversion processing. PCOPYRIGHT: (C)2004,JPO