| 摘要 |
A technique for segmenting an image into text areas and non-text areas in which an image is stored with the following information per pixel: gray scale intensity (4 bits) and an indication of whether the pixel is neutral or color (1 bit). The image, e.g. a scanned RGB image, is converted to 0-15 levels of intensity and has a neutral/color indication bit assigned to each pixel. The technique proceeds in three phases as follows: Tile the image by square blocks, e.g. 6x6 or 8x8 for 600 dpi images, and store information about each block in a buffer; sweep the buffer left to right three tile rows at a time and make a preliminary decision for every tile-block in the middle row; examine the decision made in the previous step in a context block, e.g. a 3x3 block, and make revisions if necessary.
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