Patent ID: 6091774
Filing Date: 2000-07-18
Classification: H04N

Abstract:
A code-amount control device, which is used in a video coding device for encoding a video-sequence by performing an interframe-prediction for each block, orthogonally transform an interframe-prediction error, quantizing transform coefficients and encoding the quantized values by a variable-length encoding circuit, for controlling the code-amount for each of blocks into which an image data is divided, comprising: converting means for converting under designated conditions the quantized values into a plurality of data; table means for outputting the code-length of a variable-length code corresponding to each data; accumulating means for determining a predictive code-amount by accumulating the code-lengths for each block or each of subblocks into which each block is divided; rate control means for outputting the target code-amount per block or subblock; and output switching-over means for rounding off a portion of the quantized values, said portion exceeding the target code-amount when the predictive code-amount exceeds the target code-amount.