| 摘要 |
Even in the case of coding the input image by dividing into tiles, a fine image quality adjustment is possible based on the characteristic of each tile. The input image signal is transformed to the coded data through the tile dividing unit 102 , the wavelet transforming unit 103 , and the entropy coding unit 106 , and is stored in the code memory 107 . In parallel to this processing, the distortion calculating unit 108 calculates the distortion in each coding pass of each code block, and stores it in the distortion memory 109 . On the other hand, the complex tile deciding unit 111 decides whether a particular tile is the complex tile or not. The tile classifying memory 112 stores the decision output. A distortion data outputted from the distortion memory 109 is outputted to the multiplier 110 , the multiplier 110 multiplies the distortion data by the weight coefficient selected by the weight coefficient selecting unit 113 . The weighted distortion of each coding pass is output to the rate controlling unit 114 , the rate controlling unit 114 executes code amount control of coded data.
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