Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Reexamination Certificate
2008-04-03
2011-12-06
Perungavoor, Sath V (Department: 2624)
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
C382S137000, C382S173000, C382S175000, C382S254000, C382S276000, C358S003260, C358S448000, C358S462000
Reexamination Certificate
active
08073284
ABSTRACT:
Thresholding gray-scale images to produce bitonal images. In one example embodiment, a method for thresholding a gray-scale image to produce a bitonal image includes several acts. First, a first portion of gray-scale pixels of the gray-scale image are thresholded based on a global threshold and edge strength information. Next, a second portion of the gray-scale pixels are thresholded based on the global threshold and local pixel information. Finally, a third portion of the gray-scale pixels are thresholded based on a local threshold.
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Heidemann Jason
Perungavoor Sath V
Seiko Epson Corporation
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