| 摘要 |
The object of the invention is to identify accurately which of the plurality of image types each pixel in a document image is included by a small circuit structure. When spacial filtering process is performed to the image signals of a photograph region and a letter region shown by use of a filter with a filter coefficient having a sum of -1 as shown, the image signals shown will be intensified, and by binary coding the same with a threshold "0", an edge detection result could be gained, with no edge portion detected in the photograph region. Therefore, in the identification circuit of the image processing device, the identification on whether or not the observation pixel is included in the photograph region could be easily and accurately be performed based on whether or not the edge portion exists in the local block.
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