Method and apparatus for deciding quantization parameter

Details Method and apparatus for deciding quantization parameter Method and apparatus for deciding quantization parameter

1995-12-13

1997-06-10

Au, Amelia

Television

Bandwidth reduction system

Data rate reduction

H04N 730

Patent

active

056381263

ABSTRACT:
A quantization parameter is decided in response to input data and a control signal for use in a video signal encoding device which quantizes and encodes the input data and transmits the encoded data by way of a buffer, wherein the control signal representing the degree of fullness of the buffer. The apparatus for deciding the quantization parameter comprises: a circuit, in response to the control signal, for deciding a current candidate quantization parameter for each of the slices of a current frame; a circuit for generating a slice number signal identifying the slice of the current frame that is being processed; memory for storing the current candidate quantization parameter in case the slice number signal indicates that a second slice of the current frame is being processed; and a circuit for selecting the previous candidate quantization parameter for a second slice of a preceding frame previously stored at the memory as the quantization parameter in case the slice number signal indicates that a first slice of the current frame is being processed; and for selecting the current candidate quantization parameter as the quantization parameter in case the slice number signal denotes that remaining slices of the current frame is being processed.

REFERENCES:
patent: 5317397 (1994-05-01), Odaka et al.
patent: 5489944 (1996-02-01), Jo
patent: 5515105 (1996-05-01), Lim

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