Compression method of halftone image data
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United States of America Patent
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May 1, 1990
Grant Date -
N/A
app pub date -
Apr 1, 1988
filing date -
Apr 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A halftone image data compression method includes steps wherein digital halftone image data is divided into a plurality of blocks, orthogonal transformation is performed in units of blocks to obtain transformed coefficients, and the transform coefficients are quantized and coded. A final quantization interval is determined in units of blocks using a frequency of generation of the AC components of the transform coefficients of each block quantized to zero as a parameter.
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