Patent ID: 6298151
Filing Date: 2001-10-02
Classification: H04N

Abstract:
A method performed in a digital processor for processing a document image to determine image types present therein, the steps comprising:receiving, from an image source, a document image having a plurality of pixels therein, each pixel represented by a binary image signal, and storing at least a portion thereof representing a region of the document image in a data buffer;retrieving, from the data buffer, the binary image signals for the document image; anddetermining, using template matching filters, image types present in the region of the document image, said determining step including applying a first stage template matching filter to the binary image signals for the document image to produce a first filtered output image, applying a second stage template matching filter to the first filtered output image to produce an error image, and XORing the error image and the first filtered output image to mask from the first filtered output image any binary image signals from segments of the document image not comprised of text to produce a first output image, wherein the first output image contains only textual segments therein.