Image analysis – Image compression or coding – Gray level to binary coding
Patent
1996-11-18
2000-04-25
Boudreau, Leo H.
Image analysis
Image compression or coding
Gray level to binary coding
382173, 382176, 382321, G06K 936
Patent
active
060553367
ABSTRACT:
An optical character recognition system recognizes character images in a document image comprised of character areas and non-character areas. The system includes a step of obtaining multi-value image data representing the document image, the multi-value image data having a first resolution and comprising plural pixels each having a pixel density value. The system binarizes the multi-value image data to produce binary image data having a second resolution for the document image, the second resolution being greater than the first resolution. The target pixel in the multi-value image data is binarized based on pixels adjacent to the target pixel. The system further includes steps for performing block selection on the binary image data for the document image in order to identify character areas of the document image and non-character areas of the document image, and performing optical character recognition processing on binary image data for the character areas of the document image to obtain computer codes for recognized character images in the character areas.
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Boudreau Leo H.
Canon Kabushiki Kaisha
Desire Gregory
LandOfFree
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