Image signal coding/decoding system using adaptive quantization

Details Image signal coding/decoding system using adaptive quantization Image signal coding/decoding system using adaptive quantization

1991-09-30

1993-10-12

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358433, G06K 936

Patent

active

052530752

ABSTRACT:
An image signal coding/decoding system comprises an encoder for encoding an image signal by using the adaptive quantization, and a decoder for decoding the coded image signal by using the adaptive inverse-quantization. The encoder comprises an activity detection element for detecting, every blocks obtained by dividing an image signal every a specific time length, activities indicating degree of changes in the signal in the respective blocks; a quantization class determination element for determining class values of a plurality of quantization classes set in correspondence with respective stages of the adaptive quantization from the detected activities; and for outputting the determined class values as class information to the decoder, a filter element for filtering not only the class values but also class values at the peripheral blocks; and a quantization step width determination element for determining, every blocks, widths of quantization steps corresponding to a value obtained by multiplying these class values by fixed coefficients on the basis of class values subjected to filtering. The decoder comprises a decode element for decoding coded data transmitted from the encoder by using the variable-length codes, and an inverse-quantization element for inverse-quantizing the variable-length decoded signal on the basis of class information transmitted from the quantization class determination element.

REFERENCES:
patent: 4760460 (1988-07-01), Shimotohno
patent: 5051840 (1991-09-01), Watanabe et al.
patent: 5060285 (1991-10-01), Dixit et al.
patent: 5093872 (1992-03-01), Tutt

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