Image analysis – Image compression or coding – Gray level to binary coding
Reexamination Certificate
2006-06-13
2006-06-13
Patel, Kanjibhai (Department: 2625)
Image analysis
Image compression or coding
Gray level to binary coding
C382S171000, C382S199000, C358S521000
Reexamination Certificate
active
07062099
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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Li Yulin
Wang Jie
Zhao Hongsheng
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Patel Kanjibhai
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