Image analysis – Image segmentation – Distinguishing text from other regions
Patent
1996-11-14
1998-09-22
Kelley, Christopher S.
Image analysis
Image segmentation
Distinguishing text from other regions
382194, 382257, 358462, G06K 934
Patent
active
058126953
ABSTRACT:
A system for determining the type of graphical data within a scanned image. The system scans an image to obtain grayscale image data, and then performs a density slice operation on the grayscale image data, using a predetermined grayscale range, to produce binary image data. The system erodes the binary image data, and counts the number of black pixels remaining within the image data. If the count of the black pixels within the image exceeds a maximum acceptable pixel count, the area is considered to be continuous tone, such as a photograph, otherwise, the region is considered to be bi-tonal, such as line art or text. The system can also perform multiple density slices and erosions, using different grayscale ranges, OR the results, and then analyze the result of the OR operation to determine the type of image.
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Hewlett--Packard Company
Kelley Christopher S.
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