Patent ID: 7471828
Filing Date: 2008-12-30
Classification: G06K

Abstract:
1. An optical reader comprising: a hand held housing; a trigger for initiating reading of decodable indicia; means for generating an array of multibit pixel values; means for establishing max and min peak tracking lines for said array of pixel values; means for subjecting said array of multibit pixel values to a peak characterizing data development routine, wherein said subjecting means including means for sensing peaks of said array of multibit pixel values using iteratively aggressive peak sensing thresholds; means responsive to said subjecting means for developing peak characterizing data characterizing peaks of said array of multibit pixel values; means for determining a plurality of digitization parameters based on said developed peak characterizing data, wherein said plurality of digitization parameters include a peak sensing threshold parameter, and grey band position parameters, said grey band position parameters defining a grey band; and means for finding a first plurality of edge positions and a second plurality of edge positions represented by said array of pixel values utilizing said plurality of digitization parameters wherein the edge positions composing said first plurality of edge positions are located outside said grey band; and wherein the edge positions composing said second plurality of edge positions are located within said grey band.