Patent ID: 7273175
Filing Date: 2007-09-25
Classification: G06K

Abstract:
1. An apparatus for locating at least one QR code in an image, comprising: characteristic ratio detection means for detecting the potential QR code location symbol areas by carrying out a plurality of detections for detecting the characteristic ratio of the location symbols; critical edge detection means for detecting the critical edges of the potential QR code location symbol areas; location symbol grouping means for matching the detected QR code location symbol areas into potential QR codes; and verification means for excluding the false QR codes, wherein the characteristic ratio detection means further comprises: horizontal characteristic ratio detection means for detecting the characteristic ratio in horizontal lines of the image; and vertical characteristic ratio detection means for detecting the characteristic ratio in vertical lines selected according to the detection results of said horizontal characteristic ratio detection means, and wherein said horizontal characteristic ratio detection means is further configured to detect the characteristic ratio in two contiguous horizontal lines after having detected the first horizontal line containing the characteristic ratio, and said vertical characteristic ratio detection means is further configured to detect the characteristic ratio in three contiguous vertical lines selected according to the detection results of said horizontal characteristic ratio detection means.