Image analysis – Image compression or coding – Adaptive coding
Reexamination Certificate
2006-04-04
2006-04-04
Chen, Wenpeng (Department: 2625)
Image analysis
Image compression or coding
Adaptive coding
C382S251000
Reexamination Certificate
active
07024044
ABSTRACT:
A method is for compressing a digital image that is made up of a matrix of elements, with each element including a plurality of digital components of different types for representing a pixel. The method includes splitting the digital image into a plurality of blocks, and calculating for each block a group of DCT coefficients for the components of each type, and quantizing the DCT coefficients of each block using a corresponding quantization table scaled by a gain factor for achieving a target compression factor. The method further includes determining at least one energy measure of the digital image, and estimating the gain factor as a function of the at least one energy measure. The function is determined experimentally according to the target compression factor.
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Bruna Arcangelo
Galluzzo Agostino
Mancuso Massimo
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Chen Wenpeng
Jorgenson Lisa K.
STMicroelectronics S.r.l.
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