Patent ID: 6873712
Filing Date: 2005-03-29
Classification: G06K,G06T

Abstract:
1. A method for identifying an object image that uses a density difference between a background image and an object image in a picture, said method comprising the steps of: dividing a screen taken by a camera into a plurality of blocks; placing a Standard Object image, which corresponds to said blocks, as an insert picture for each block in said screen, said placing being made based upon an arrangement point that is an arbitrary point in said blocks on a picture showing a background image and is used as a reference point; determining, for said inserted picture, a standard normal vector group for outline portions of said Standard Object image based upon density differences in said Standard Object image and a background image; determining related vector data which consists of a position information and an angle information, said position information being from an arrangement point of said Standard Object image to respective normal vectors of a respective said standard normal vector group of said Standard Object image, and said angle information being of a respective normal vector; storing said related vector data as standard data for said Standard Object image in a block in which each normal vector of said Standard normal vector group is detected; storing standard data based on said Standard object image for all of said divided blocks; determining a normal vector group for outline portions of an object image based upon density differences in an object image and a background image for an inputted picture in a screen that shows an object to be identified and is taken by a camera; determining Answer point groups, which are the same as arrangement points of respective said Standard Object image, from a normal vector group based upon standard data stored in blocks where a normal vector of a normal vector group appears; and evaluating a focus point region formed by said Answer point groups.