Image analysis – Image transformation or preprocessing – Measuring image properties
Patent
1992-12-23
1996-04-09
Mancuso, Joseph
Image analysis
Image transformation or preprocessing
Measuring image properties
382173, 382176, G06K 936
Patent
active
055069185
ABSTRACT:
A document skew detection apparatus for facilitating the recognition of the contents of a printed document includes an image processing section for generating a binary coded image of the document containing a plurality of black picture elements distributed among white picture elements to depict pure text lines and non-text portions of the document. The binary coded image is then modified so that certain ones of the black picture elements satisfying a predetermined condition are integrated together to generate a coarse document image being decreased in resolution. The apparatus also includes an image extraction section for extracting from the document image a local image region containing pure text lines occupying an almost entire area thereof, and skew detection section for detecting a direction of orientation of the text lines of the local region, and for determining an angular difference between a detected direction and a reference direction as a skew angle of the printed document.
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Kabushiki Kaisha Toshiba
Mancuso Joseph
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