Image compression coder having improved scale factor control

Details Image compression coder having improved scale factor control Image compression coder having improved scale factor control

1993-10-04

1997-01-14

Vu, Kim

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358430, 358433, H04N 1415

Patent

active

055945546

ABSTRACT:
Disclosed is an image compression coding device in which time domain image data is transformed to frequency domain data and then compressed by multiplying the frequency domain data by quantization coefficients scaled by a scale factor based on a non-linear relationship of log(ACVdata) versus log(SF). One or more statistical passes are made through the frequency domain data using initial scale factors in which ACV data is obtained based on the newly defined relationship. The New Scale Factor (NSF) is then calculated based on the initial scale factors (ISF1, ISF2), the accumulated code volumes for the two scale factors (ACVdata1, ACVdata2), and the target code volume (TCV) of the compressed file.

REFERENCES:
patent: 5051840 (1991-09-01), Watanabe et al.
patent: 5157488 (1992-10-01), Pennebaker
patent: 5323187 (1994-06-01), Park
patent: 5416604 (1995-05-01), Park
patent: 5475502 (1995-12-01), Lee et al.
Zoran Corporation Preliminary Specification Sheet for the ZR36040 JPEG Image Coder/Decoder, Aug. 1992.

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