Patent ID: 8432447
Filing Date: 2013-04-30
Classification: G06K,G08G

Abstract:
1. A system for detecting a stripe pattern, comprising: a stripe pattern foreground filter unit that calculates, for each pixel in an image, feature values, each representing an increment of a pixel value in a surrounding area of said each pixel from a pixel value outside of said surrounding area, as a size of said surrounding area is changed, to find a maximum value out of said feature values, said stripe pattern foreground filter unit allotting said maximum value as a stripe pattern foreground filter value, said stripe pattern foreground filter unit allotting a size of said surrounding area that gives said maximum value as a stripe pattern foreground width; a stripe pattern background filter unit that calculates, for each pixel in an image, feature values, each representing a decrement of a pixel value in a surrounding area of said each pixel from a pixel value outside of said surrounding area, as a size of said surrounding area is changed, to find a maximum value out of said feature values, said stripe pattern background filter unit allotting said maximum value as a stripe pattern background filter value, said stripe pattern background filter unit allotting a size of said surrounding area that gives said maximum value as a stripe pattern background width; a stripe pattern integration filter unit that calculates a stripe pattern integration filter value, for each pixel in said image, based on said stripe pattern foreground filter value in said pixel, on said stripe pattern background filter value at a stripe pattern foreground end pixel that gives a maximum value out of said stripe pattern background filter values in a surrounding area of a pixel spaced apart from said each pixel by a distance corresponding to said stripe pattern foreground width at said each pixel, and on said stripe pattern foreground filter value at a stripe pattern background end pixel that gives a maximum value out of said stripe pattern foreground filter values in a surrounding area of a pixel spaced apart from said stripe pattern foreground end pixel by a distance corresponding to said stripe pattern background width at said stripe pattern foreground end pixel; and a stripe pattern area detection unit that decides, for each area in said image, whether or not a stripe pattern is contained in said each area, based on a feature value which is calculated from said stripe pattern integration filter value in said each area, said stripe pattern area detection unit outputting position information regarding said area in which said stripe pattern is contained, as stripe pattern area information.