Image analysis – Pattern recognition – Feature extraction
Patent
1998-06-10
2000-12-19
Lee, Thomas D.
Image analysis
Pattern recognition
Feature extraction
382195, 382205, 358462, G06K 946
Patent
active
06163624&
ABSTRACT:
An image processing circuit of the present invention includes a succession calculating circuit. In the succession calculating circuit, an average value calculating circuit determines an average value of image data, inputted via line memories, in a specific region, and a multivalue-binary converting circuit converts, in accordance with the average value, the image data into binary data in which the entire image data in the specific region are separated into black pixels and white pixels. A succeeding black pixels calculating circuit calculates the number of succeeding black pixels each in a main scanning direction and in a sub scanning direction, and determines respective maximum values in the main scanning direction and in the sub scanning direction so as to output the respective maximum values as a main scanning direction maximum succession and a sub scanning direction maximum succession. The types of the specific region including the target pixel are discriminated in accordance with the succession, a complexity, and a compared subtracted value so as to carry out an image process in accordance with image types, thus improving discrimination accuracy of image features, used for selecting of an image process which should be carried out, without causing the size of the circuit to increase.
REFERENCES:
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patent: 5016118 (1991-05-01), Nannichi
patent: 5296939 (1994-03-01), Suzuki
patent: 5701364 (1997-12-01), Kanno
patent: 5892592 (1999-04-01), Adachi et al.
Conlin David G.
Daley, Jr. William J.
Lee Thomas D.
Sharp Kabushiki Kaisha
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