Lossless image compression method
AssigneeAltek Corporation
InventorsChen Hung Chan, Hong Long Chou
Life of this patent
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Abstract
A compression method is used for processing an image having a plurality of pixels, in which an image width of the image is W. The compression method includes the steps of selecting N continuous pixels from the image, where N is a positive integer greater than or equal to 2 and is less than the image width W; performing differential pulse code modulation (DPCM) so as to obtain N non-negative differences corresponding to the N pixels according to values of the N pixels; calculating to obtain a coding parameter according to the N non-negative differences; and coding the N non-negative differences according to the coding parameter.
Claims8
A lossless image compression method, for processing an image having a plurality of pixels, wherein an image width of the image is W, the lossless image compression method comprising:
- (a) selecting N continuous pixels from the image, where N is a positive integer greater than or equal to 2 and is less than the image width W;
- (b) performing a differential pulse code modulation (DPCM) means, so as to obtain N non-negative differences corresponding to the N pixels according to values of the N pixels;
- (c) calculating to obtain a coding parameter according to the N non-negative differences;
- and
- (d) coding the N non-negative differences according to the coding parameter.
Dependencies are inferred from the claim text.