Image analysis – Histogram processing – For setting a threshold
Patent
1989-12-21
1993-09-14
Mancuso, Joseph
Image analysis
Histogram processing
For setting a threshold
382 45, 382 56, G06K 936
Patent
active
052456765
ABSTRACT:
Skew angle of an image is determined based on determination of location of fiducial points on the image. Fiducial points may be located through a comparison of the scanning of a first line with scanning of a subsequent line. These fiducial points may be defined in terms of pixel color transitions located on a first scan line without a corresponding transition on the succeeding scan line. Skew angle may be determined from image data in uncompressed form or in compressed form. Where skew angle is determined from image data in compressed form, the 2-dimensional CCITT facsimile recommendations may be used. In such cases, the locations of the fiducial points may be taken as the locations of the pass codes of the compressed image data. Specifically, pass codes indicating a pass of white pixels are used.
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Couso Yon J.
Mancuso Joseph
Xerox Corporation
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