发明名称 |
Method of and apparatus for compressing image data. |
摘要 |
<p>An image is conceptually divided into pixel blocks each having a plurality of pixels. RGB image data representing the image are converted into luminance data and color difference data in the NTSC form. Standard deviation values of these data are calculated in each pixel block and are compared with threshold values, so that the pixel blocks are classified into two types. The image data in the pixel blocks of respective types are compressed at different compression rates to obtain image data compressed. <IMAGE> <IMAGE></p> |
申请公布号 |
EP0432806(B1) |
申请公布日期 |
1995.04.05 |
申请号 |
EP19900124450 |
申请日期 |
1990.12.17 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
ARAGAKI, MASAMI |
分类号 |
H04N1/41;G06T9/00;H04N1/64;H04N7/26;H04N7/30;H04N11/04;(IPC1-7):H04N1/46 |
主分类号 |
H04N1/41 |
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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