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Identification method of two-dimensional barcode image on high-reflect light cylindrical metal

A two-dimensional barcode and image recognition technology, applied in the field of automatic identification, can solve problems such as inability to read two-dimensional DataMatrix barcodes, software not implemented, and barcode shape distortion.

Inactive Publication Date: 2012-02-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing two-dimensional barcode reading systems can only process two-dimensional barcode images that are complete in a flat state, not seriously deformed, and under ideal lighting conditions
The parts or tools marked by DPM seldom have flat surfaces, most of them are cylindrical, and the marked surfaces are mostly smooth metal materials, so the images collected by the camera usually contain strong reflections, uneven lighting and contrast. Inferior phenomenon, and the shape of the barcode will be distorted to a certain extent
For a cylindrical surface with a relatively large curvature, there may even be a reflective area covering the code area, resulting in the loss of barcode information
The existing barcode recognition technology cannot deal with the unique and complicated situations of the two-dimensional barcode marked on the metal cylinder. Two-dimensional DataMatrix barcode on the cylindrical metal material, which limits the application of two-dimensional barcode technology in DPM
The application number is "201110100489.6", and the patent name of the invention is "a metal cylinder direct marking two-dimensional barcode reading device and reading method". From the hardware aspect, how to eliminate the cylinder highlight is designed, but the software aspect has not been realized.

Method used

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  • Identification method of two-dimensional barcode image on high-reflect light cylindrical metal
  • Identification method of two-dimensional barcode image on high-reflect light cylindrical metal
  • Identification method of two-dimensional barcode image on high-reflect light cylindrical metal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0145] Example 1: Single image recognition

[0146] Such as Figure 8 As shown, this example selects a cylindrical metal with a diameter of Φ12, and uses MV1300 to capture the two-dimensional barcode image on it under the reading tool. Schematic diagram of reading tooling such as figure 2 shown. In this example, the shutter speed is 7ms, the gain adjustment is 58, the image size is 640*512pix, the acquisition speed is high speed, and the reflective tape does not cover the two-dimensional barcode information. In order to achieve the above object, the overall process of the technical solution of the present invention is as follows: figure 1 shown.

[0147] 1. Under the reading tool, the two-dimensional barcode image captured is as follows: Figure 8 shown. Firstly, according to the fact that there are two white sides in the two-dimensional barcode area as positioning sides, determine the position of the two-dimensional barcode in the horizontal direction: xlef=182, xrigt=...

example 2

[0158] Example 2: fusion recognition

[0159] Such as Figure 10 As shown, this example selects a cylindrical metal with a diameter of Φ6, and takes a two-dimensional barcode image on it. Since the radius of the cylinder is small and the curvature is too large, no matter how you adjust the camera parameters, it is impossible to eliminate part of the two-dimensional barcode information covered by the reflective tape, so fusion recognition should be adopted. In this example, the shutter speed is 7us, the gain adjustment is 58, the image size is 640*512pix, and the acquisition speed is high speed.

[0160] 1. Adjust the black metal baffle to make the gap smaller appropriately, and at the same time observe the image displayed in the video display box on the right until the highly reflective area is removed. Then this example selects 2 seconds to read 4 images, the read images are as follows Figure 11 Shown in (a).

[0161] 2. As shown in the algorithm in 5.5, the four images ...

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Abstract

The invention discloses an identification method of a two-dimensional barcode image on a high-reflect light cylindrical metal, comprising the steps of: correcting the unevenness of cylindrical illumination by primarily positioning a two-dimensional barcode area; exactly positioning four edges of a barcode; judging whether output data meet a check function; acquiring and blending a plurality of images; correcting the images by means of affine transformation; dividing a grid; and extracting information in an iteration way and the like to obtain an information matrix of a two-dimensional barcode module. The identification method is higher in identification rate to the two-dimensional barcode on the metal which is capable of being rotated and tilted at optional angles, mild or moderate in geometric distortion, mild or moderate in uneven illumination, not high in contrast ratio, and mild or moderate in attrition.

Description

technical field [0001] The invention relates to a method for extracting information from a DataMatrix two-dimensional barcode on a highly reflective cylindrical metal, and belongs to the technical field of automatic identification. Background technique [0002] Direct Part Marking DPM (Direct Part Marking) technology is a permanent marking technology that can directly form text, symbols or patterns on the surface of the product. The one-dimensional barcode or two-dimensional barcode symbol formed on the surface of the product using DPM technology, It is an important technical means to realize product traceability identification. In the selection of barcode symbols, considering factors such as limited product surface area and improved symbol reading rate, two-dimensional DataMatrix barcodes are currently used as permanent two-dimensional barcodes for products. This is because the DataMatrix barcode has large encoding capacity, high density and strong error correction ability....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
Inventor 何卫平王伟雷蕾林清松李文涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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