Patent ID: 7852317
Filing Date: 2010-12-14
Classification: G06F

Abstract:
1. A method, comprising: detecting one or more images appearing on a pixelated sensor of respective one or more spatially fixed markers, said markers emitting non-visible radiation having a predetermined frequency band, said pixelated sensor within a handheld device, said handheld device containing a filter that passes radiation in the predetermined frequency band and substantially excludes other radiation, and an imaging element that produces the one or more images of the one or more spatially fixed markers on the pixelated sensor, the markers adapted for placing in fixed locations within view of the pixelated sensor; generating image data for each of the one or more images; wherein the handheld device includes a processor for processing the image data by performing the operations of: determining an intensity value for each pixel of the pixelated sensor, the intensity value attaining one of three or more quantized intensity values: identifying pixels which have an intensity value above a specified threshold; using only those pixels which have an intensity value above the specified threshold, generating coordinate data based on both the intensity value for each of the pixels and the location of each of the pixels on the pixelated sensor; wherein the handheld device is capable of processing the image data and generating the coordinate data; and transmitting information derived from said determining.