| 摘要 |
<p>A moving-picture coding apparatus is capable of controlling a bit rate of output codes so as not to exceed a target bit rate and of reducing noise in a decoded image. The apparatus includes: a converter 13 for converting prediction errors of a plurality of pixel data into frequency components on a block basis; a quantizer 14 for quantizing converted prediction errors with reference to a quantization table; a dequantizer 15 for dequantizing quantized prediction errors with reference to a quantization table; a coder 18 for coding the quantized prediction errors to generate codes; an output buffer 19 for buffering the codes; a buffer checker 20 for checking a code-occupied quantity in the output buffer; a plurality of quantization tables; and, a quantization table selector 21 for selecting one quantization table from the plurality of quantization tables in accordance with the code-occupied quantity. The quantizer employs the selected quantization table, and the dequantizer employs a quantization table determined for a group of pictures. A method of coding and a recordable medium for a program for carrying out the method are also claimed.</p> |
