Method and apparatus for deciding quantization parameter

摘要

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.