Image compression method with variable quantization parameter
AssigneeAltek Corporation
InventorsChen Hung Chan, Hong Long Chou
Life of this patent
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Abstract
An image compression method s used for processing a plurality of pixels of an image. The image compression method includes the steps of receiving N successive pixels; obtaining N pixel differences and N map differences corresponding to the N pixels according to values of the N pixels through differential pulse code modulation; calculating to obtain a quantization reference value corresponding to the N pixels according to the N pixel differences; obtaining a quantization parameter corresponding to the N pixels according to the quantization reference value; and encoding the N map differences according to the quantization parameter.
Claims9
An image compression method with a variable quantization parameter, for processing a plurality of pixels of an image, the method comprising:
- receiving N successive pixels;
- obtaining N pixel differences and N map differences corresponding to the N pixels according to values of the N pixels through a differential pulse code modulation (DPCM) means;
- calculating to obtain a quantization reference value corresponding to the N pixels according to the N pixel differences;
- obtaining a quantization parameter corresponding to the N pixels according to the quantization reference value;
- and
- encoding the N map differences according to the quantization parameter.
Dependencies are inferred from the claim text.