IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce contouring and coding distortion in an image while preventing roughness in the image.

SOLUTION: This image processing apparatus for reducing distortion in an input image includes: a masking signal generating unit 101 that generates a masking signal for reducing the distortion; and a masking signal adding unit 102 that adds the masking signal to the input image, wherein the masking signal generating unit 101 includes: a level difference processing unit 105 that smoothes a level difference between pixel values of pixels in the input image; a difference calculating unit 106 that calculates a difference between the input image and an image which has been processed by the level difference processing unit 105; and a random number setting unit 108 that sets an amplitude so as to make the amplitude decrease as the difference approaches a predetermined value and creates a random number having the set amplitude.

COPYRIGHT: (C)2008,JPO&INPIT