| 摘要 |
<p>PROBLEM TO BE SOLVED: To properly compress an image, including two kinds of image which are an image of a naturally continuous gradation and an image of binary/noise free/shallow pixel density by the same system. SOLUTION: A mode selection mechanism 110 discriminates whether the input image data 110 are a continuous gradation image or a binary image or which part of the image has such a characteristics so as to select the mode, and the input image data 110 gives the part to wavelet system coders (a reversible wavelet transformation block 102, an imbeded sequencing quantization block 103, and a horizontal context model block 105) or a binary system coder (a gray coding block 104). Each coder has the same entropy coder 106 in common.</p> |
