Compression method of halftone image data

Details Compression method of halftone image data Compression method of halftone image data

1988-04-01

1990-05-01

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

382 56, H04N 140

Patent

active

049222732

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.

REFERENCES:
patent: 4394774 (1983-07-01), Widergren
patent: 4698689 (1987-10-01), Tzou
patent: 4734767 (1988-03-01), Kaneko
patent: 4748511 (1988-05-01), Nichols
patent: 4797653 (1989-01-01), Takayama
patent: 4797945 (1989-01-01), Suzuki

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