Patent Document ID: 8064637
Application ID: 12191721
Patent Status: 1

Claim One:
1. A method for identifying a fluorescence mark in a printed document without using a UV light source, said method comprising: using an image acquisition device to derive an input digital image that represents a printed document including a background and a fluorescence mark adjacent the background, said input digital image comprising multiple color channel digital images, with each color channel digital image comprising a plurality of pixels each defined by a gray value; for each pixel of at least one of said color channel digital images, adjusting the gray value of the pixel based upon a variance of adjacent pixel gray values to define a filtered digital image comprising a plurality of pixels each defined by an adjusted gray value; deriving a binary image that represents said filtered digital image by mapping each adjusted gray value of the filtered image to either a first or second possible binary pixel value, said binary image comprising a binary representation of said fluorescence mark and a binary representation of said background.