Motion image data compression coding apparatus and image data co

Details Motion image data compression coding apparatus and image data co Motion image data compression coding apparatus and image data co

1992-02-20

1993-09-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 7133

Patent

active

052454274

ABSTRACT:
A motion image data compression coding apparatus and an image data compression coding method capable of smoothing compressed data among frames are disclosed. A data amount of compressed data is obtained by a hybrid coding of a combination of an orthogonal transform such as a discrete cosine transform, a quantization and a variable length coding of motion image data of one frame. A quantization step size is expressed by a product of a scaling factor f and quantization matrix factors q. The scaling factor f is determined from a code amount produced up to the preceding frame, a target code amount and an AC level of the transform factors of the present frame. Prior to the quantization and the variable length coding, a code amount actually resulted by the same coding is detected, and by considering the actual code amount, the scaling factor f for the last quantization is corrected.

REFERENCES:
patent: 4979038 (1990-12-01), Guichard
patent: 5073821 (1991-12-01), Juri

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