Method for compression and expansion of display data

Details Method for compression and expansion of display data Method for compression and expansion of display data

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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Fan et al. “A novel coefficient scanning scheme for directional spatial prediction-based image compression”, Multimedia and Expo, 2003. ICME '03. Publication Date: Jul. 6-9, 2003, pp. II- 557-60 vol. 2.

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