Image processing apparatus and image processing method

Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction

Reexamination Certificate

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Details

C382S264000, C358S003030

Reexamination Certificate

active

07916967

ABSTRACT:
The prevent invention can prevent roughness in an image and reduce contouring and coding distortion in the image. The image processing apparatus according to the present invention reduces distortion in an input image, and includes: a masking signal generating unit101that generates a masking signal for reducing the distortion; and a masking signal adding unit102that adds the masking signal to the input image, wherein the masking signal generating unit101includes: a level difference processing unit105that smoothes a level difference between pixel values of pixels in the input image; a difference calculating unit106that calculates a difference between the input image and an image which has been processed by the level difference processing unit105; and a random number setting unit108that sets an amplitude, creates a is random number having the set amplitude, the amplitude decreasing, as the difference approaches a predetermined value.

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patent: 2004-336478 (2004-11-01), None

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