专利汇可以提供High-quality compressing method for binary text image专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain an overall high compression ratio by assigning at least one of two kinds of compression ratios to respective adjacent data and determining it according to the frequency of information contents of data from specific adjacency on pixels in an image.
CONSTITUTION: In an original frame a large low-frequency area and a small high-frequency area are discriminated, a scheme for loss compression is used for the low-frequency area and a scheme which allows no-loss compression is applied to the high-frequency area. A compressing/releasing decompression method consists of prefiltering, evaluation of compression possibility, etc. For example the prefiltering operates on a principle that pixels adjacent to a segment are removed and all black pixels are removed from a binary image, which are shown in figures 1 and 2 as an example. The figure 1 consists of a grating diffused colored dots and background noise disappears from data, after scanning, as shown in the 2nd figure. Consequently a method which compresses image data at a high compression ratio is obtained.
COPYRIGHT: (C)1991,JPO,下面是High-quality compressing method for binary text image专利的具体信息内容。
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