METHOD AND DEVICE FOR ENCODING PICTURE SIGNAL

摘要

Complexity of information of a video signal is detected to control a quantizing step based on the above complexity. Difference of said video signal is quantized with different quantizing steps in response to said control. Generated code lengths of a plurality of resultant quantized outputs are compared with a target code length. A quantization index indicative of a quantizing step is determined based on a result of said comparison. The above video signal is quantized with the quantizing step based on said quantization index. The above quantized output is subjected to a variable length encoding processing. Further, when the quantization index is determined, a value of the target quantization index indicative of a target quantizing step size allowing the target code length to be obtained is searched only between two quantization indexes respectively indicating two quantizing steps which allow two generated code lengths most approximate to a value of the target code length.