Two-dimensional code distortion correction method and apparatus

Abstract

Embodiments of the invention disclose a two-dimensional code distortion correction method and apparatus. The method comprises the steps of obtaining a two-dimensional code image; according to the two-dimensional code image, calculating distorted image coordinates of four vertexes of the two-dimensional code image; according to a preset length-width ratio of a two-dimensional code, calculating undistorted image coordinates corresponding to the four vertexes of the two-dimensional code image; according to the distorted image coordinates and the undistorted image coordinates, establishing a linear equation set; according to the linear equation set, calculating unknown parameters in a homography matrix; according to a calculation result, correcting the two-dimensional code image; and outputting a rectangular image containing the corrected two-dimensional code image. The method and the apparatus can be used for distortion correction of different types of two-dimensional codes; the use convenience and the diversity of application scenes are remarkably improved; the rotation-free corrected two-dimensional code image can be quickly obtained; the correction process is simple and quick; thefinally output corrected two-dimensional code image is a rectangular region image only containing two-dimensional code region information; subsequent decoding is facilitated; and the decoding efficiency can be improved.

Description

technical field [0001] The present application relates to the technical field of two-dimensional code recognition, and in particular to a two-dimensional code distortion correction method and device. Background technique [0002] With the development of intelligent hardware technology, the application of QR codes in daily life and industry is becoming more and more common. QR codes can store more information than traditional barcodes, and can also represent more data types. [0003] In the actual use of two-dimensional codes, due to imaging conditions and other reasons, there are often projection distortions in the two-dimensional code image, which affects subsequent code reading and recognition. see figure 1 For example, when using a mobile phone to scan a QR code for payment in a supermarket, due to the performance parameter error of the mobile phone lens, or the imaging plane of the QR code is not perpendicular to the optical axis of the mobile phone lens, etc., the pro...

AI Technical Summary

Problems solved by technology

[0005] This application provides a two-dimensional code distortion correction method and device to solve the problem that the existing two-dimensional code distortion correction method cannot correct the rotation of the two-dimensional code

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