Video encoder with quantization controlled by inter-picture corr

Details Video encoder with quantization controlled by inter-picture corr Video encoder with quantization controlled by inter-picture corr

1995-09-27

1998-05-12

Tung, Bryan S.

Television

Bandwidth reduction system

Data rate reduction

348419, H04N 732

Patent

active

057513589

ABSTRACT:
A method and apparatus for encoding a picture with improved prediction accuracy in predicting the basic quantization step. The apparatus for encoding a picture includes a picture data storage unit, a picture information evaluating unit, an inter-picture correlation detection unit, an orthogonal transform unit for orthogonally transforming the picture data for generating orthogonal transform coefficients, a quantization unit for quantizing the orthogonal transform coefficients produced by the orthogonal transform unit at a pre-set quantization step, an adaptive compression method selection unit and a quantization step control unit. The information quantity is evaluated from stored picture data of plural pictures, and the inter-picture correlation is detected. A picture data compression method is adaptively selected based upon the evaluated value of the information quantity and the inter-picture correlation information. The basic quantization step is predicted from the evaluated value and a pre-set compressed data quantity obtained on compressing one-picture picture data by the selected compression method and the evaluated value.

REFERENCES:
patent: 5089888 (1992-02-01), Zdepski et al.
patent: 5245427 (1993-09-01), Kunihiro
patent: 5412431 (1995-05-01), Vogel
patent: 5521643 (1996-05-01), Yim
patent: 5568184 (1996-10-01), Shibata et al.

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