Method of determining quantization step in a subband coding syst

Details Method of determining quantization step in a subband coding syst Method of determining quantization step in a subband coding syst

1994-09-15

1996-01-23

Boudreau, Leo H.

Image analysis

Image compression or coding

Adaptive coding

382251, 358430, 348405, G06K 936

Patent

active

054871190

ABSTRACT:
An image coding method by which accurate code amount control can be performed without the necessity of recursive processing. The image coding apparatus is applied to an image coding apparatus which includes a subband division section for dividing an input image signal into a plurality of subband signals having frequency bands different from each other and having predetermined bit numbers distributed individually thereto, a subblock division section for dividing the subband signals obtained from the subband division section into a plurality of subblocks each having a spatial spread, a classification section for classifying the subband signals for each of the subblocks obtained from the subblock division section, a quantization section for quantizing the subband signals for each of the subblocks obtained from the subblock division section by linear quantization with a step width determined in response to a class outputted from the classification section and outputting a quantization index, and a code allocation section for allocating the quantization index from the quantization section as a codeword.

REFERENCES:
patent: 5253075 (1993-10-01), Sugiyama
patent: 5283656 (1994-02-01), Sugahara
patent: 5327502 (1994-07-01), Katata et al.
patent: 5396567 (1995-03-01), Jass
"Sub-Band Coding of Monochrome and Color Images", Hamid Gharavi et al., IEEE Transactions on Circuits and Systems, 35(2):207-214 (1988).

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