摘要 |
PROBLEM TO BE SOLVED: To efficiently store information in a high-frequency area of an input image. SOLUTION: This method has a detection step for detecting a highfrequency area from multi-valued image data, a 1st holding step for information on the high-frequency area detected in the said detection step in a 1st holding means 103, a coupling step for coupling the information on the high-frequency area held in the 1st holding means 103 with information on a high-frequency area held in a 2nd holding means 104, and a 2nd holding step for storing the information on the coupled high-frequency areas in the 2nd holding means 104. |