Rotation of images for optical character recognition

Details Rotation of images for optical character recognition Rotation of images for optical character recognition

1991-08-06

1993-08-10

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 62, 358486, G06K 932

Patent

active

052356515

ABSTRACT:
A method and apparatus for properly orienting an text in order to perform optical character recognition (OCR). The text is digitized and placed into an image. The image is subsampled to determine an initial "guess" about the orientation of the image. If there are are specified number of sets of lines between lines having no black-to-white or white-to-black transitions, then the image is assumed to be oriented correctly. Otherwise, the image is assumed to be perpendicular to the line-of-sight of the OCR engine and the image is rotated 90 degrees counterclockwise in a preferred embodiment. A combination of rotations and trial OCR scans for the image is performed until the best results for the trial OCR is obtained or the maximum number of iterations is exceeded. Then, the remainder of OCR is performed on the image.

REFERENCES:
patent: 4961231 (1990-10-01), Nakayama et al.
patent: 5001766 (1991-03-01), Baird
patent: 5031225 (1991-07-01), Tachikawa et al.
patent: 5038393 (1991-08-01), Nanba
patent: 5101448 (1992-03-01), Kawachiya et al.
patent: 5111514 (1992-05-01), Ohta

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