Image processing device and image processing method, and computer-readable recorded medium

An image processing method comprising the steps of:

• generating frequency related information related to frequencies of respective pixel values based on pixel values of a plurality of pixels comprising an original image and error information;
• deciding a representative value of a pixel value based on said frequency related information;
• accumulating said decided representative value;
• replacing pixel values of a plurality of pixels comprising said original image with said accumulated representative values;
• generating said error information indicative of errors between pixel values of respective pixels of an outputted image obtained by said replacement and pixel values of a plurality of pixels comprising said original image;
• and
• controlling said frequency related information generating step, said representative value deciding step, said representative value accumulating step, said representative value replacing step and said error information generating step such that said respective steps may be executed repeatedly until a predetermined condition is satisfied.

A recording medium readable by a computer and which has recorded thereon a program for enabling a computer to execute the steps of:

• generating frequency related information related to frequencies of respective pixels based on pixel values of a plurality of pixels comprising an original image and error information;
• deciding a representative value of a pixel value based on said frequency related information;
• accumulating said decided representative value;
• replacing the pixel values of said plurality of pixels comprising said original image with said accumulated representative values;
• generating said error information for indicating errors between the pixel values of respective pixels of an outputted image obtained by said replacement and the pixel values of a plurality of pixels comprising said original image;
• and
• controlling said frequency related information generating step, said representative value deciding step, said representative value accumulating step, said representative value replacing step and said error information generating step such that these steps may be repeatedly executed until a predetermined condition is satisfied.