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Two-dimension code positioning method in low signal-to-noise ratio environment

A low signal-to-noise ratio, positioning method technology, applied in the field of two-dimensional code processing, can solve problems such as positioning failure and noise information, and achieve the effect of improving purity and strong anti-noise ability

Active Publication Date: 2017-10-24
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology

The current common method is edge positioning based on morphology and edge operators such as canny operator and Sobel operator, but these operators will introduce noise information, resulting in positioning failure

Method used

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  • Two-dimension code positioning method in low signal-to-noise ratio environment

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Experimental program
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Embodiment 1

[0038] Such as figure 1 As shown, a two-dimensional code positioning method in a low signal-to-noise ratio environment includes the following steps:

[0039] S1: Use a handheld device to take a color image of the target, and convert the original color image into a pseudo-grayscale image;

[0040] S2: Use the homomorphic filtering method to enhance the brightness of the grayscale image;

[0041] S3: Use the small line transformation to extract the line from the grayscale image to obtain the edge information map of the target;

[0042] S4: Perform projection positioning on the extracted edge information to obtain the coordinates of the area where the target is located, and intercept the area with the same coordinates on the grayscale image to obtain the image of the target;

[0043] S5: Use the Otsu method to binarize the target image obtained in the previous step, and output the positioning effect.

[0044] The process of step S1 is as follows:

[0045] The image collected ...

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Abstract

The present invention provides a two-dimensional code positioning method in a low signal-to-noise ratio environment. According to the invention, the Beamlet Transformation is introduced, and the method is strong in anti-noise capability. Therefore, the line features of a target can be accurately identified in the strong noise environment. As a result, the purity of an edge image is improved. Meanwhile, the method provides a basis for the decoding of two-dimensional codes in the low signal-to-noise ratio environment.

Description

technical field [0001] The invention relates to the field of two-dimensional code processing, and more specifically, relates to a two-dimensional code positioning method in a low signal-to-noise ratio environment. Background technique [0002] A two-dimensional code is a graphic symbol that uses a specific geometric model to arrange on a two-dimensional plane according to a specified coding method to realize information storage. Two-dimensional codes can be printed on the surface of different objects and read by image acquisition equipment or photoelectric scanning equipment to achieve rapid information processing. There are a variety of two-dimensional code systems on the market. Common two-dimensional codes include QR code, PDF417, Data matrix, Longbei code, Maxi code, etc. Among them, the QR code has a large amount of information storage, high reliability, can represent Chinese characters and images, and has strong security and anti-counterfeiting properties, so it has b...

Claims

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Application Information

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IPC IPC(8): G06K7/14
CPCG06K7/1417G06K7/1443
Inventor 胡建国邓成谦黄家诚晏斌林培祥李凯祥
Owner SYSU CMU SHUNDE INT JOINT RES INST
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