Method and apparatus of rate conversion for coded video data

Details Method and apparatus of rate conversion for coded video data Method and apparatus of rate conversion for coded video data

1995-10-18

1997-08-12

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

H03M 740

Patent

active

056570155

ABSTRACT:
Picture coded data that are obtained by coding at a coding rate R1 that is input via a coded data input terminal 1 are supplied to a variable length decoder. The variable length decoder decodes data for which variable length coding has been performed, and DCT coding information is transmitted to an inverse quantizer. A quantization controller calculates a quantization step that is necessary for re-quantization, and controls a quantizer. The DCT coding information for which the inverse quantization has been performed by the inverse quantizer is recovered into a DCT coefficient. The DCT coefficient is quantized again by a quantizer at quantization step Q that is determined by the quantization controller, and the result is transmitted to a variable length coder. The variable length coder performs variable length coding of the received data at a coding rate R2, and outputs the resultant picture coded data to a coded data output terminal. In this manner, a rate conversion apparatus for picture coded data can be provided that employs simpler means than does the transcoding that provides the same performance as does transcoding.

REFERENCES:
patent: 5412484 (1995-05-01), Yoshikawa
"Consideration on Bitrate Conversion", ITE Annual Convention '94, pp. 183-184 (in Japanese and English).

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