Method and means for extracting fixed-pitch characters on noisy

Details Method and means for extracting fixed-pitch characters on noisy Method and means for extracting fixed-pitch characters on noisy

1996-11-12

1999-06-22

Au, Amelia

Image analysis

Pattern recognition

Context analysis or word recognition

382209, 382272, 382292, G06K 972

Patent

active

059150394

ABSTRACT:
Fixed-pitch, fixed-font characters embedded in a noisy gray-scale image of picture elements (pels) within a complex background can be extracted prior to execution of any recognition operations by first deriving a normalized Boolean-coded image from the gray-scale image. Then, a subset of at least three uncontaminated character triples is formed by filtering the Boolean-coded image. Next, an affine transform is approximated from locations in the Boolean-coded image of at least three noncollinear ones of the uncontaminated character triples. Lastly, the locations in a logical matrix array of all possible character triples are estimated according to the affine transform.

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