| 摘要 |
<p>It is possible to prevent deterioration of image quality by selecting with priority an code amount from a DPCM path so as to satisfy the target code amount. Either a code amount obtained by a first compression method for quantizing input image signals by different quantization steps or a code amount obtained by a second compression method having a lower compression ratio and smaller loss than the first compression method is added for each encoding method selection unit, thereby calculating the total code amount of the length-equalizing unit. The total code amount calculated is compared to the target code amount in the length-equalizing unit. According to the comparison result, the quantization step in the first compression method is decided so that quantization is performed by the quantization step decided or the second compression method is selected for each encoding method selection unit.</p> |
