| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform high-accuracy rate control by suppressing the occurrence of a control error of a code amount even in one-pass processing. <P>SOLUTION: An image encoder is provided with a quantization step size calculation part 20 that calculates a quantization step sizeΔfrom a target code amount BT(n) and a statistic E(n) so as to give the quantization step sizeΔto a quantization part 13 and a lower-bit truncation part 16 that truncates all or a part of lower bits outputted without being compressed from an entropy coding part 15 when a code amount B(n) of code data outputted from the entropy coding part 15 to an output buffer 17 exceeds a target code amount BT(n). <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
