System and method for compressing an image

Details System and method for compressing an image System and method for compressing an image

2005-04-22

2009-11-17

Strege, John B (Department: 2624)

Image analysis

Image compression or coding

C382S245000

Reexamination Certificate

active

07620252

ABSTRACT:
In a method for compressing an image, a number of non-zero AC coefficients for a component transform and the locations of the non-zero AC coefficients in a transform block are determined. One of a plurality of coding modes is selected in response to the number of non-zero AC coefficients and the locations of the non-zero AC coefficients satisfying predetermined criteria, where the plurality of coding modes comprise different bit allocations from each other. In addition, the locations and values of the non-zero AC coefficients and a DC coefficient for the component transform are coded according to the selected coding mode, to thereby compress the image.

REFERENCES:
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patent: 6577681 (2003-06-01), Kimura
patent: 2003/0081845 (2003-05-01), Mukherjee et al.
Lakhani, A modification to the Huffman coding of JPEG's baseline compression algorithm, 2000, Data Compression Conference, 2000. p. 1.
Mukherjee, D. et al., “Low Complexity Guaranteed Fit Compound Document Compression”, Compression and Multimedia Technologies Group, Hewlett Packard Laboratories, CA, 2002.

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