Image analysis – Histogram processing – For setting a threshold
Patent
1988-05-16
1991-03-19
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 18, G06K 932, G06K 946
Patent
active
050017667
ABSTRACT:
A method and apparatus for determining a predominant angle of orientation of an image with respect to a reference angle. A file of picture elements is generated which depicts the image with respect to the reference angle. The picture elements are projected onto a plurality of contiguous segments of imaginary lines at selected angles across the file. Each imaginary line is perpendicular to its associated direction of projection. The number of picture elements that fall into the segments for each projection are counted. An enhancement function is applied to the segment counts of each projection. The projection that generates the largest value of the enhancement function defines the angle of orientation of the image. The position of a document scanner or the document itself may be rotated to compensate for the detected skew.
REFERENCES:
patent: 4338588 (1982-07-01), Chevillat et al.
patent: 4497066 (1985-01-01), Gasparri, Jr.
patent: 4539703 (1985-09-01), Clearman et al.
patent: 4558461 (1985-12-01), Schlang
patent: 4688088 (1987-08-01), Hamazaki et al.
AT&T Bell Laboratories
Boudreau Leo H.
Fallon Steven P.
Nelson G. E.
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