Vertex positioning method for QR code image geometric correction

A technology of geometric correction and positioning method, which is applied in the field of image processing, and can solve problems such as time-consuming, large amount of Hough transform calculations, and inaccurate detection results.

Inactive Publication Date: 2016-03-02
JINAN UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0004] At present, the key step in the geometric transformation of the QR code image is to locate the four vertices of the QR code. The traditional method is to use the Hough transform; Using the Hough transform to detect the edge of the QR code image in the image will cause inaccurate detection results.

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  • Vertex positioning method for QR code image geometric correction
  • Vertex positioning method for QR code image geometric correction
  • Vertex positioning method for QR code image geometric correction

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0034] A vertex positioning method for geometric correction of a QR code image, specifically comprising the following steps:

[0035] S1, through the three positions on the four borders of the QR code to detect the edges of the graphics;

[0036] S2. Using the detection method of position detection pattern positioning to locate the edge of the position detection pattern, and obtain the boundary equation of the QR code;

[0037] S3. Calculate the intersection points where the boundary equations intersect each other to obtain the four-corner vertices.

[0038] The step S2 specifically includes the following steps:

[0039] S21. Scanning the QR code in both horizontal and vertical directions, scanning to an area with a position detection graphic feature, and recording it;...

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Abstract

The invention discloses a vertex positioning method for QR code image geometric correction. The vertex positioning method concretely comprises the following steps that the edges of three position detection patterns on four boundaries of a QR code are examined respectively; the edges of the position detection patterns are positioned by utilizing a position detection pattern positioning detection method so that boundary equations of the QR code are obtained; and the intersection points of intersection of every two boundary equations are calculated so that the vertexes of four corners are obtained. According to the method, only corresponding starting point and end point pixels are required with no requirement for complete edge information of a QR code image when a position detection pattern module area is detected so that the problems which cannot be solved in the prior art that the QR code image has no obvious boundary characteristics or boundary information cannot be extracted when the environmental background is complex can be solved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a vertex positioning method for geometric correction of a QR code image. Background technique [0002] In the future, more and more item information needs to be identified, especially in the express delivery industry. Tools that recognize QR code images need to be more and more efficient and accurate. Through the improvement of the recognition method, a recognition tool based on the new method can be produced. [0003] The QR code in the two-dimensional code is widely used in commercial circulation, warehousing, library information information, postal system, transportation system and other fields because of its advantages of large storage capacity, high security and stability, and various data types. However, information collection is the most basic part of information technology, and it is also the most critical link. In practical applications, QR codes are often defaced in v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32
CPCG06V10/245
Inventor 张多英杜慧勤钱俊祺宋贤媛
Owner JINAN UNIVERSITY
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