| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reflect a visual frequency characteristic properly on a subband encoding of a frame base or a field base of an interface image signal based on a theoretical point of view. <P>SOLUTION: A block 201 is a wavelet conversion one for dividing a subband. Blocks 202, 203, 204 and 205 are those of a quantization, an entropy encoding, a packet generation, and a code formation each for processing the encoding to each subband-divided subband. A control block 206 includes a table 207 of a visual frequency characteristic value calculated in advance based on a theoretical knowledge; a table 208 of a reference quantization step number; and a quantization step number controlling block 209 to set one to adjust the reference quantization step number read from the table 208 by the visual frequency characteristic value read from the table 207, according to each format of an input image signal and the frame base/the field base to the quantization block 202, or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
