DM code locating and identification method and system

A code positioning and positioning point technology, applied in the field of DM code positioning and identification, can solve problems such as data block unit length error, module missing, DM code detection pattern positioning error, etc.

Active Publication Date: 2017-03-08
元启工业技术(青岛)有限公司
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the above-mentioned DM code defect, it can be known that the DM code may be missing some modules in the DM code detection pattern and the data area according to the damaged program, thereby causing the positioning error of the DM code detection pattern and the DM code detection pattern. The unit length of the data block is wrong when meshing

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  • DM code locating and identification method and system
  • DM code locating and identification method and system
  • DM code locating and identification method and system

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Embodiment Construction

[0098] Before implementing the present invention, it is first necessary to use an image acquisition device to acquire the original image containing the DM code.

[0099] According to the first aspect of the present invention, a method for locating and identifying a DM code is provided.

[0100] figure 1 Shown is an embodiment of a method for DM code positioning and identification according to the present invention, comprising the following steps:

[0101] S1. Obtain a binarized image of the original image. Usually the original image collected by the camera is an 8-bit grayscale image. Even if the original image is collected as an 8-bit color image, it is usually necessary to convert the 8-bit color image to an 8-bit grayscale image. Perform binarization operation in the grayscale image, that is, divide the grayscale into 256 levels of grayscale from 0 to 255, and select the grayscale threshold, set the grayscale value in the grayscale image greater than the grayscale thresho...

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Abstract

The invention relates to a DM (Data Matrix) code locating and identification method and system. The method comprises the steps of obtaining a binary image of an original image; extracting an effective region which contains a DM code from the binary image; obtaining a confidence single-edge image from the effective region; performing Hough transform on the confidence single-edge image, establishing an angle shielding region after finding a response point corresponding to a first search mode edge in a parameter space of a Hough transform domain, searching for a second search mode edge outside the angle shielding region, and obtaining three locating points at the end points of the two search mode edges; obtaining two switching mode edges of the DM code by rotating a pixel accumulator with a direction, and solving a fourth locating point; performing inverse perspective transformation on the DM code according to the four locating points to obtain a standard DM code image and performing mesh division on the standard DM code image; and performing codon extraction on the DM code subjected to the mesh division, and recovering codon information. According to the method and the system, the DM code still can be efficiently located and identified when a DM image is seriously defiled.

Description

technical field [0001] The invention relates to a method and system for DM code positioning and recognition, belonging to the field of digital image processing, coding and decoding. Background technique [0002] The Direct Part Marking (Direct Part Marking, hereinafter referred to as DPM) method can record a permanent mark on the product. In the industrial field, the DPM method is usually used to mark the one-dimensional barcode or two-dimensional barcode on the surface of the product, and to extract the barcode information through image positioning, recognition technology, encoding and decoding technology, and to realize the production tracking of the product in the production link. Assembly management, life cycle maintenance, etc., and further realize functions such as dynamic number management, assembly sequencing, and product statistics. In addition, the combination of these technologies can also play an important role in the process of product repair and maintenance, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/20G06K9/34G06T7/13
CPCG06T2207/20061G06V10/225G06V30/153G06V10/40G06V30/10
Inventor 李东
Owner 元启工业技术(青岛)有限公司
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