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Two-dimension code recognition area positioning method

A technology for identifying areas and two-dimensional codes, which is applied in the field of algorithms, can solve the problems of blurred recognition edges and difficult positioning, and achieve the effect of easy reading

Active Publication Date: 2019-06-07
SHANGHAI SMARTEE DENTI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In the prior art, Data Matrix is ​​mostly used in printing, engraving, photolithography, corrosion, stamping and other methods. The recognition method of the two-dimensional code generated by these methods is relatively simple because the recognition degree of its edge is high, but the method of 3D printing is adopted. , to directly generate a two-dimensional code, its recognition edge is fuzzy, and it is difficult to achieve positioning. Therefore, it is of great significance to study a method that can perform regional positioning on the two-dimensional code generated by the 3D printing method.

Method used

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  • Two-dimension code recognition area positioning method

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Embodiment 1

[0068] Embodiment 1 A method for locating areas identified by two-dimensional codes

[0069] A method for two-dimensional code identification area positioning, such as figure 1 As shown, take a photo of a product with a QR code and follow the steps below:

[0070] 1) Perform mathematical morphology opening operation on the input image, perform morphological erosion and expansion operations on the grayscale image, separate the area of ​​the two-dimensional code through morphological erosion, restore the area of ​​​​the two-dimensional code through the morphological opening operation, and Binarize the image, such as figure 2 shown;

[0071] First, set a square structural element g, and use the structural element g to perform grayscale erosion on the input image f (x, y), as follows:

[0072] (fΘg)(s, t)=min{f(s+x, t+y)-g(x, y)|s+x, t+y∈Df, x+y∈Dg}

[0073] For the result of the corrosion in the previous step, use the same structural element g to perform gray scale expansion...

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Abstract

Disclosed in the invention is a method for localizing a recognition region of a two-dimensional code. Morphological erosion and dilation operation are carried out to realize separation and recovery of a two-dimensional code region; a two-dimensional code domain is calculated by using a region marking method and smoothing processing is carried out; and then an accurate boundary of the region is determined. Using the method disclosed by the invention, a two-dimensional code image with an unclear boundary region can be localized precisely. Especially, the two-dimensional code region with poor image definition and blurred edge can be localized accurately, so that follow-up reading of two-dimensional code information can be realized conveniently. Therefore, the method disclosed by the invention is suitable for accurate localization of a two-dimensional code region.

Description

technical field [0001] The invention belongs to the field of algorithms, and relates to an area positioning method, in particular to a two-dimensional code identification area positioning method. Background technique [0002] Data Matrix is ​​a QR code widely used in international manufacturing. Data Matrix is ​​a member of the two-dimensional code, invented by the American International Data Corporation in 1989, and is widely used for anti-counterfeiting and overall identification of commodities. It is a code that can be directly marked on a solid surface. The code can be automatically read by the corresponding scanning device like an ordinary barcode, and is very popular in the manufacturing industry. At present, Data Matrix is ​​widely used in product identification, anti-counterfeiting, quality tracking, automatic storage, logistics management and control and other systems. Data Matrix adopts complex error correction code technology, which makes the code have super ant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/14G06T5/00G06T7/66
CPCG06K7/1443G06T5/002
Inventor 姚峻峰查凯王龙
Owner SHANGHAI SMARTEE DENTI TECH CO LTD
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