Method and system for rapidly eliminating false detection for position detection patterns of QR code

Abstract

The invention provides a method and a system for rapidly eliminating false detection for the position detection patterns of a QR code. The method comprises the following steps of: dividing a first sampling area above the upper edge of each position detection pattern, dividing a second sampling area below the lower edge of each position detection pattern, dividing a third sampling area at the left side of the left edge of each position detection pattern, and dividing a fourth sampling area at the left side of the right edge of each position detection pattern; acquiring the chromatic value of each pixel point in each sampling area, then counting the number of the pixel points belonging to the same chromatic value, and obtaining four histograms by taking the chromatic value as a transversal coordinate and taking the number of the pixel points as a horizontal coordinate; filtering and deriving the four histograms respectively, judging whether two histograms are histograms presenting single-peak characteristics, if so, then correctly detecting; or else, the detection is false detection. The method and the system are capable of simply and rapidly judging whether the positioned position detection patterns are correct, and further has the advantages of being low in calculation resource consumption, and high in positioning result accuracy.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional code image processing, and in particular relates to a method and system for rapidly eliminating false detection of QR code position detection patterns. Background technique [0002] QR (Quick Response, Quick Response) code is a kind of two-dimensional barcode. It was invented by Denso-Wave Company in Japan in 1994. Compared with other two-dimensional barcodes, it has the advantages of fast reading speed, high data density and small footprint. Advantages, widely used in identity verification, security anti-counterfeiting, e-commerce and many other fields. [0003] Such as figure 1 As shown, it is a schematic structural diagram of a QR code, which is a square array composed of multiple black square units and multiple white square units, mainly including two parts, the coding area and the functional area, wherein the functional area includes position detection graphics and positioning graphi...

AI Technical Summary

Problems solved by technology

Therefore, accurately locating the position detection pattern belongs to the basic step of QR code decoding, which directly affects the decoding speed and decoding accuracy of QR code, etc.

[0004] In the prior art, since the images of other areas in the QR code image have a certain similarity with the position detection pattern, there is a situation of misdetection of the position detection pattern, which leads to the inability to correctly decode the QR code in the subsequent process

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