Image analysis – Image compression or coding
Reexamination Certificate
2004-12-21
2009-08-11
Ahmed, Samir A. (Department: 2624)
Image analysis
Image compression or coding
C382S166000, C382S233000
Reexamination Certificate
active
07574056
ABSTRACT:
A display data compression method can execute both irreversible compression and reversible compression, wherein display data are divided into a plurality of two-dimensional blocks, each of which is subjected to compression. In the irreversible compression, display data of each block are subjected to discrete cosine transform, quantization using a quantization table, one-dimensional rearrangement, and Huffman coding using one-dimensional Huffman table. In the reversible compression, display data of each block are subjected to scanning and compression, which are repeatedly performed by changing the scanning method therefor, so as to produce compressed data having the smallest number of effective bits. In expansion, the compressed data are decoded so that the decoded data are combined together over the blocks, thus restoring the original display data.
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Funakubo Noriyuki
Kimura Toru
Ahmed Samir A.
Liu Li
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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