| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To compress and encode image data at high speed with a small amount of computation while maintaining picture quality. <P>SOLUTION: For a transformation coefficient that a DWT section 13 outputs after wavelet-transforming an inputted image signal, a quantization section 14 performs quantization, rearrangement, and bit shifting processing based upon a quantization step size that a picture quality control section 23 finds according to target picture quality, and rearrangement and bit shifting processing based upon setting information on a region of interest that an ROI section 15 sets. A coefficient bit modeling section 20 performs bit modeling processing in bit plane units for a transformation coefficient QD outputted from the quantization section and an arithmetic encoding section 21 mathematically encodes encoded data BD inputted from the coefficient bit modeling section 20. Then an encoding quantity control section 22 performs rate control of encoded data AD inputted from the mathematical encoding section 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
