Image processing method and apparatus using self-adaptive binarization
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United States of America Patent
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Jun 13, 2006
Grant Date -
Feb 13, 2003
app pub date -
Jul 15, 2002
filing date -
Jul 31, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a unique method, apparatus, system and storage medium for image binarization process, wherein an image to be processed is divided into a plurality of sub-images and an binarization threshold for each of the sub-images is determined based on the gray-levels of the edge pixels detected in respective sub-image. The image processing method of the present invention comprises: calculating a gray-level statistical distribution of pixels of an image, detecting edge pixels in an image based on an edge criterion corresponding to the gray-level statistical distribution, dividing the image into a plurality of sub-images; determining a binarization threshold for each of the sub-images based on the gray-levels of edge pixels detected in the sub-image; and performing binarization process for each of the sub-images based on the binarization threshold of the sub-image.
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