Data compressing system

Details Data compressing system Data compressing system

1996-03-27

1998-08-11

Boudreau, Leo

Image analysis

Image compression or coding

Transform coding

382246, G06K 900

Patent

active

057938989

ABSTRACT:
In a code compressing system for determining a quantizing step of a image compressing code, a second DCT calculating portion performs a DCT calculation for each element reduced and divided by a picture dividing portion. A second quantizing portion quantizes the calculated result with the maximum value of quantizing steps of an applicable system. A third quantizing portion quantizes the calculated result with the minimum value of the quantizing steps of the applicable system. A code amount controlling portion determines the difference between the code amounts generated by the second quantizing portion and the third quantizing portion for each element divided by the picture dividing portion and obtains an optimum quantizing step corresponding to the determined result, the target compressing ratio, and the target encoding bit rate. A first quantizing portion quantizes the calculated result of a first DCT calculating portion with the optimum quantizing step determined by the code amount controlling portion.

REFERENCES:
patent: 5136376 (1992-08-01), Yagasaki et al.
patent: 5166987 (1992-11-01), Kageyama
patent: 5184229 (1993-02-01), Saito et al.
patent: 5321440 (1994-06-01), Yanaguhara et al.
patent: 5481554 (1996-01-01), Kondo
patent: 5515388 (1996-05-01), Yagasaki

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