Image encoding method and image apparatus

Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level

Reexamination Certificate

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Details

C382S166000, C382S232000, C382S275000, C358S518000

Reexamination Certificate

active

07630574

ABSTRACT:
An object of the invention is to provide an image encoding method and an image apparatus which do not request change on a decoder and can give effects on many applications by having an encoder carry processing for reducing occurrence of noise. A pixel whose tone value is 255 and corresponds to white is changed to a value outside of an extent of the tone value in the inverse direction for black, in other words to a value more than the whitest tone value 255. When an image for which this tone shifting processing is performed is encoded and decoded, a ripple31having a larger tone value than 255 occurs in a white portion of the image. Abnormal condition of the image in a shape of ripple on the decoded image existing prior to clipping is centered in a tone value larger than 255. Accordingly, mosquito noise occurs in a portion with a tone value larger than 255 and outside of an extent of the tone value. When this image is clipped by the tone value 255, the mosquito noise can be reduced.

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