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A qr code positioning and correction method

A calibration method, QR code technology, applied in the direction of instruments, induction recording carriers, electromagnetic radiation induction, etc., can solve the problems of unrecognizable calibration, etc., achieve accurate results, easy to use, and improve accuracy

Active Publication Date: 2022-03-08
FOSHAN SHUNDE SUN YAT SEN UNIV RES INST +2
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AI Technical Summary

Problems solved by technology

Once one of the three corners of the image-finding pattern is missing, the existing method cannot recognize the correction

Method used

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  • A qr code positioning and correction method
  • A qr code positioning and correction method
  • A qr code positioning and correction method

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Embodiment Construction

[0038] refer to Figure 1 to Figure 6 , a method for positioning and correcting a QR code missing a place in an image-finding graphic, comprising the following steps,

[0039] S1: Use the contour search method to find all the contours in the entire image, and use the triple nesting standard and whether there is a common center point in the nested contours to initially screen the contours, that is, a set of contours that meet the triple nesting is regarded as Comply with the standard, calculate its center point for each contour in this group of contours, and calculate its center point for each layer of contours. The coordinates obtained by calculating the weighted average of the points are regarded as the coordinates of the center point of the contour. If the center points of the three-layer nested contours also coincide, they are retained, otherwise they are not retained;

[0040] S2: 2 If the outline that meets the standard is less than or equal to 3 groups, then skip this s...

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Abstract

The invention discloses a method for positioning and correcting a QR code. This method binarizes the image, and then finds out the other two image-finding patterns except the damaged image-finding pattern, and calculates its QR code version number. For the QR code whose version number is 1, perform morphological transformation and edge extraction, then straight line detection to obtain vertices, and then perform correction transformation. For the QR code whose version number is 2 and above, find the correction figure in the lower right corner of the standard figure of the QR code, and use the center point of the image finding figure and the center point of the correction figure to perform correction transformation. The invention can accurately locate and correct the QR code under the condition that one of the image-finding graphics of the QR code is missing and there is certain perspective distortion.

Description

technical field [0001] The present invention relates to a method, in particular to a method for positioning and correcting a QR code in which an image-finding pattern is missing. Background technique [0002] The finder graphics of the three corners of the QR code can help determine the position, size and inclination of the symbol. Therefore, currently popular mobile devices on the market cannot recognize the absence of image finding graphics. When the image-finding graphics of the QR code are missing, and there is a certain inclination angle between the camera equipment and the QR code when people use the camera, which causes a certain degree of perspective distortion in the image, there is no good positioning correction method for this situation. QR code, rectified into a square and extracted from the picture. In the prior art, for dealing with distorted QR codes, the image finding pattern of the three corners of the QR code is heavily relied on to determine the position...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/14
CPCG06K7/1417G06K7/1452G06K7/146
Inventor 吴小龙张东陈星光
Owner FOSHAN SHUNDE SUN YAT SEN UNIV RES INST
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