Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-12-02
2000-12-26
Le, Vu
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
3484191, H04N 712
Patent
active
061670871
ABSTRACT:
A picture signal encoding apparatus on which, even if a picture is not uniform in picture pattern, the picture can be rendered substantially uniform in picture quality, the volume of bits occupying a virtual buffer is stabilized, deterioration in picture quality is rendered less visible and in which stable rate control is assured. The picture signal encoding apparatus, dividing a picture making up moving picture signals into plural macro-blocks MB and encoding the signals from one macro-block to another, includes a relative coding difficulty calculating circuit for calculating the relative coding difficulty from one macro-block to another MB, and a characteristic value calculating circuit for calculating the weighting coefficients (characteristic values) specifying visibility degree of picture quality deterioration from one macro-block MB to another. The picture signal encoding apparatus also includes a bit rate controller for calculating the quantization scale for encoding each macro-block MB using the complexity degree and the volume of allocated bits for macro-block-based encoding.
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Le Vu
Oh Seong-Kun
Sony Corporation
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