Method of non-linear filtering of degraded document images

Details Method of non-linear filtering of degraded document images Method of non-linear filtering of degraded document images

G - Physics

06

K

G06K 9/62 (2006.01) G06K 9/34 (2006.01) G06K 9/36 (2006.01) G06T 5/20 (2006.01)

Patent

CA 2150391

A method identifies and models the distortion in a document using a two-dimensional nonlinear filter. The two-dimensional nonlinear filter is then used to improve the performance of optical character recognition systems in recognizing characters in documents that have been degraded, as for example by repeated photocopy reproductions or by fax transmission.

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