| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an image-encoding and decoding technology for encoding a given part of area with priority, and decoding the coded image data without adding excess cost. <P>SOLUTION: A wavelet transformation unit 10 carries out wavelet transformation on an original image, and a quantizing unit 12 quantizes wavelet transform coefficient. A ROI selection unit 18 selects the target area of the original image, and a ROI mask generating unit 20 generates a ROI mask for specifying the wavelet transform coefficient (called "ROI transform coefficient"), corresponding to the attention area. A lower-bit zero replacement unit 24 is referred to the ROI mask and the lower bit of non-ROI transform coefficient is replaced with zero. An entropy encoding unit 14 carries out entropy encoding of the wavelet transform coefficient replaced in the order of higher bit plane. An encoded data generating unit 16 for changing the encoded data into a stream, along with an encoding parameter and generates an encoded image as output. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
