Image analysis – Pattern recognition – Feature extraction
Patent
1997-01-02
1999-10-05
Chang, Jon
Image analysis
Pattern recognition
Feature extraction
358466, 382137, 382272, 382195, G06K 952
Patent
active
059636696
ABSTRACT:
A method of processing a matrix of gray scale picture elements derived from lifting an image of a document to extract strokes from the image of the document comprises the steps of (a) calculating a global average value of the gray scale picture elements, (b) placing a window over a portion of the matrix of gray scale picture elements, (c) calculating a local average value of the gray scale picture elements contained in the window of step (b), (d) comparing the global average value of step (a) with the local average value of step (c), (e) calculating a relative figure of importance (RFI) value for each gray scale picture element contained in the window of step (b) when the local average value calculated in step (c) is less than the global average value calculated in step (a), (f) increasing the size of the window of step (b) and replacing the window of step (b) with this increased sized window when the local average value calculated in step (c) is greater than the global average value calculated in step (a), and (g) repeating step (b), (c), (d), (e), and (f) using the increased sized window obtained in step (f) until the local average value calculated in (c) is less than the global average value.
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Hassanein Khaled S.
Higgins Raymond L.
Wesolkowski Slawomir B.
Chan Michael
Chang Jon
Frederick, II Gilberto
NCR Corporation
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