Correlated masking process for deskewing, filtering and recognit

Details Correlated masking process for deskewing, filtering and recognit Correlated masking process for deskewing, filtering and recognit

1990-02-02

1991-09-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 30, 382 34, 382 12, 235462, G06K 974

Patent

active

050520440

ABSTRACT:
Vertically segmented characters are pre-processed for optical character recognition so as to remove skew and noise by convolution with a mask consisting of parallel vertical lines with a one-pixel spatial frequency. The horizontal alignment of the mask with respect to each segmented character is adjusted until a maximum cross-correlation is found. Then, the product of the mask and the character image is formed. A histogram of the number of pixels in the product image along each vertical line of the mask is compared with a library of such histograms of known symbols and the best match identifies the symbol represented by the character image. Alternatively, the histogram is converted to a binary codeword which is compared with a library of such codewords corresponding to a set of known symbols.

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