Method and apparatus for modifying the quantization step of each

Details Method and apparatus for modifying the quantization step of each Method and apparatus for modifying the quantization step of each

1995-08-15

1997-10-14

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348420, 386112, H04N 712

Patent

active

056777345

ABSTRACT:
A method and apparatus for recording digital video signals in which digital video signals in the form of DCT coefficients, obtained by e.g., discrete cosine transform, are quantized and compressed so as to be recorded on a recording medium. A first quantization step decision unit determines a quantization step in terms of a video segment made up of plural macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity. A second quantization step decision unit determines a quantization step in terms of the macro-blocks as a unit so that the quantity of quantized data is less than the pre-set data quantity. A quantization unit quantizes the digital video signals with the quantization steps determined by the first quantization step decision unit and the second quantization step decision unit. This enables efficient encoding and improved picture quality.

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patent: 5349384 (1994-09-01), Oguro
patent: 5374958 (1994-12-01), Yanagihara
patent: 5404168 (1995-04-01), Yamada et al.

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