发明授权
- 专利标题: Image processor for encoding image data
- 专利标题(中): 用于编码图像数据的图像处理器
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申请号: US09133803申请日: 1998-08-13
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公开(公告)号: US06404919B1公开(公告)日: 2002-06-11
- 发明人: Junji Nishigaki , Shoji Imaizumi , Shigeru Moriya
- 申请人: Junji Nishigaki , Shoji Imaizumi , Shigeru Moriya
- 优先权: JP9-219548 19970814; JP9-219555 19970814
- 主分类号: G06K934
- IPC分类号: G06K934
摘要:
In an image processor, a decider decides based on image data of pixels included in a block whether the block has character attribute of non-character attribute, a first encoder encodes the image data with block truncation coding, and a second encoder encodes the image data which have been encoded by the first encoder. For a block of character attribute, the binarized data binarized by the binarizer are encoded by the first and second encoders. For a block of non-character attribute, the image data are encoded by the first and second encoders without binarization. In a different image processor, it is decide whether image data of pixels in an area consisting of a plurality of blocks are all character, all ground or mixture of character and ground. Then, an encoder encodes the image data in each block differently according to the decision.