| 摘要 |
PURPOSE:To uniformly execute a filter processing which is the pre-processing of picture signal encoding corresponding to high-frequency components. CONSTITUTION:Input pictures 10 are stored in a line buffer 31, divided into blocks and added to a pre-processing filter coefficient calculation part 40 and a pre-processor 32. At the pre-processing filter coefficient calculation part 40, the average power 22 of the high-frequency components is calculated at a high- frequency average power calculator 41 for block pictures 21, a filter coefficient 24 is calculated at a filter coefficient calculator 43 by receiving a target value 23 from a target average square difference output device 42 and the block pictures 21 are pre-processed and encoded (25) based on the filter coefficient 24. Thus, even after the pre-processing, the substantial deterioration of the picture quality within or between pictures can be suppressed. |
