| 摘要 |
<P>PROBLEM TO BE SOLVED: To convert a mixture of text data and dot-mapped image data to compressed dot-mapped data not exceeding a given size. <P>SOLUTION: After the text data are converted to dot-mapped data and then losslessly compressed, the dot-mapped image data are down-sampled as necessary. To compress the dot-mapped data to within a given size, lossless compression, lossy compression, scaling down and compression are attempted. To convert a page of object data to compressed dot-mapped data, the objects are classified and prioritized, then rasterized and compressed according to their priorities. The compression ratios are predicted and monitored, and the compression parameters are modified according to the prediction error. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
