Patent ID: 6830197
Filing Date: 2004-12-14
Classification: G06K

Abstract:
A method of obtaining information content from a two-dimensional optical pattern, comprising:capturing an image of said optical pattern, where said image is contained within an enclosed shape having a periphery; ascertaining locations in two dimensions of a plurality of optical target elements positioned within said pattern image, where each optical target element has a predetermined shape and position within said pattern image, where at least one of said plurality of optical target elements has distinct, approximately radial features, and where a portion of said plurality of optical target elements is proximate to said periphery; locating optical cells that are spaced apart from each other at predetermined locations in the optical pattern image with respect to the ascertained optical target elements and which lie primarily within a boundary formed by the ascertained target elements; and determining the information content of at least some of said located optical cells.