Rapid detection of page orientation

Details Rapid detection of page orientation Rapid detection of page orientation

1991-11-19

1994-01-04

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

395137, 345126, G06K 932, G09G 106

Patent

active

052767426

ABSTRACT:
A method of apparatus for automatic page orientation of a scanned image which compares the number of character ascending pixels to the number of character descending pixels in the image to determine if the image is properly aligned or is 90.degree. or 180.degree. out of orientation. The method and apparatus includes morphologically processing the bitmap of the scanned image using structuring elements for isolating the character ascenders and descenders. When page orientation is improper, the bitmap image of the scanned image is rotated to correct the misalignment.

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