发明名称 |
Colour image compressing method and device |
摘要 |
It is an object of the present invention to improve the compression ratio of a color image and to clearly display the outlines of characters and the like. A hue cluster classifying/unifying unit reduces the number of hue values of each pixel in a color image, based on a hue histogram, allocates the number-reduced hue value to each pixel and classifies pixels with the same hue value into one cluster. Furthermore, the unit unifies clusters whose hue values are below a predetermined value. The unit also traces the outline of a cluster whose size is below a reference value and determines that a cluster that has a lot of change points belongs to a character area. An encoding unit determines the characteristic of each cluster, based on both an area determined by an area determining unit and whether the cluster belongs to a ruled line area or a character area, and encodes pixels in each cluster by a coding method suitable for the characteristic of the cluster. |
申请公布号 |
GB2408647(B) |
申请公布日期 |
2008.12.31 |
申请号 |
GB20040015067 |
申请日期 |
2004.07.05 |
申请人 |
FUJITSU LIMITED;FUJITSU FRONTECH LIMITED |
发明人 |
SHINICHI EGUCHI;KOUICHI KANAMOTO;NAOKO SUZUKI;YUKATA KATSUMATA |
分类号 |
G06T9/00;H04N1/64;G06K9/20;G06K9/34;G06K9/36;G06T7/00;H04N1/40;H04N1/41;H04N1/46;H04N1/56;H04N1/60;H04N7/24;H04N19/00 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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