Patent ID: 8554518

Claim:
A method for associating a characteristic pattern to an image frame provided by an optical device, said method comprising: selecting a calibration set of images having characteristic figures with a pattern recognition system; dividing the image frame in a number of horizontal and vertical channels with the pattern recognition system; obtaining a digital signature for the image frame corresponding to each channel to create a calibration image matrix; obtaining a first set of characteristics and a second set of characteristics from said calibration image matrix; selecting two coordinates from at least one component in each of said first and second sets of characteristics from said calibration image matrix; forming a pattern vector from said selected coordinates from at least one component in each of said first and second sets of characteristics from said calibration image matrix; forming a calibration pattern matrix using pattern vectors from a plurality of said calibration images; forming a sample pattern vector from said selected coordinates from at least one component in each of said first and second sets of characteristics from a sample image; selecting a test vector from a set of vectors obtained by multiplying a sample pattern vector by each of the calibration image matrices; determining whether the image frame corresponds to a calibration pattern by the location in a two-dimensional plot of a two-dimensional projection of said test vector; and associating a characteristic pattern to the image frame based on the determined calibration pattern with the pattern recognition system.