Apparatus for encoding an image signal using vector quantization

Television – Bandwidth reduction system – Data rate reduction

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348422, H04N 730

Patent

active

057423423

ABSTRACT:
A digital video signal encoder includes a discrete cosine transform and quantization circuit for generating a set of quantized transform coefficients corresponding to each of the coding blocks. The set of quantized transform coefficients is divided into a first and a second subsets of scanned quantized transform coefficients by a scanning circuit, the first subset including a predetermined number of quantized transform coefficients located on a predetermined low frequency zone and the second subset having the rest of quantized transform coefficients located on a high frequency zone. The first and the second set are transferred to a vector quantizer and a variable length coder, respectively. The variable length coder performs the statistical coding of the second subset of quantized transform coefficients to thereby generate statistically coded data; and vector quantizer performs the vector quantization of the first subset of scanned quantized transform coefficients to thereby generate vector quantized data.

REFERENCES:
patent: 5109451 (1992-04-01), Aono et al.
patent: 5295203 (1994-03-01), Krause et al.
patent: 5598484 (1997-01-01), Suzuki et al.

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