Image analysis – Image enhancement or restoration
Reexamination Certificate
2008-09-05
2011-10-18
Seth, Manav (Department: 2624)
Image analysis
Image enhancement or restoration
C382S100000, C382S112000, C358S003210, C358S001110, C358S448000
Reexamination Certificate
active
08041139
ABSTRACT:
A method, device and computer readable storage media for enhancing an image for optical character recognition by detecting the edges of the image to create an edge detected image, binarizing the edge detected image to create a binary edge image for processing, dilating the binary edge image to create a dilated binary edge image, taking the XOR difference between the binary edge image and the dilated binary edge image to obtain a text boundary, superimposing the text boundary on the image and determining the pixels of the image that are covered by the text boundary, calculating the average grayscale value of the pixels of the image that are covered by the text boundary, and setting background pixels of the image to the calculated average grayscale value of the pixels of the image that are covered by the text boundary. The method optionally includes the steps of performing edge filling and hole filling on the binary edge image to create an updated binary edge image and filling holes in the dilated binary edge image to create an updated dilated binary edge image, whereby the XOR difference is taken between the updated binary edge image and the updated dilated binary edge image. The image may be binarized for optimal results after the background images have been set to the calculated average grayscale value of the pixels that are covered by the text boundary.
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Seth Manav
The Neat Company, Inc.
Woodcock & Washburn LLP
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