Method for positioning DPM two-dimension code area

A regional positioning and two-dimensional code technology, which is applied to record carriers, instruments, and computer parts used in machines. It can solve the problems of low contrast, high price, and vague reading rate indicators. The effect of fast and accurate positioning and reduction of production costs

Inactive Publication Date: 2014-02-19
TIANJIN UNIV
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Problems solved by technology

The product has strict requirements on the direction and contrast of the positioning object, and the reading rate index is still vague and expen

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  • Method for positioning DPM two-dimension code area
  • Method for positioning DPM two-dimension code area
  • Method for positioning DPM two-dimension code area

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] In order to improve the accuracy of locating DPM two-dimensional codes and reduce the production cost of DPM two-dimensional code products, the embodiment of the present invention provides a method for locating DPM two-dimensional code areas. The present invention proposes an improved SUSAN corner point detection [2] (Smith et al. proposed the (SmallUnivalueSegmentAssimilatingNucleus, SUSAN) based on brightness contrast relationship in 1997) and semi-supervised neighbor propagation clustering algorithm [3] (A new clustering algorithm proposed by FreyBJ and DueckD in 2007, which starts from considering each point as the initial cluster center without defining the number of classes in advance. The algorithm passes the attraction fu...

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Abstract

The invention discloses a method for positioning a DPM two-dimension code area. The method includes the steps that a collected image containing DPM two-dimension codes is subjected to graying processing to obtain a gray image; corner point detection is performed on the gray image through an improved SUSAN corner point detection algorithm, if corner points are detected, a next step is executed, and if no corner point is detected, the procedure is finished; an AP clustering algorithm with a semi supervision and guidance mechanism is added to cluster the detected corner points, and a priori conditions are built to determine clustered results of suspected corner point accumulation areas of the DPM two-dimension codes; clustering areas meeting the a priori conditions are marked as positioning results, a positioning image is output, and the procedure is finished. The method can reduce noise influences to a certain degree, and the phenomenon of pixel missing or pixel redundancecan not happen on a bar code area, so that the foundation is laid for accurately recognizing bar code content. The method achieves the purpose of rapidly and accurately positioning the DPM two-dimension code area and reduces production cost of two-dimensional code recognition products.

Description

technical field [0001] The invention relates to the field of positioning, in particular to a method for positioning a DPM two-dimensional code area with complex background, uneven illumination and low contrast. Background technique [0002] Direct Part Mark (DirectPartMark, DPM) [1] It was initially applied to parts in the mechanical and electronic industry, that is, by means of laser dot etching and other means, the rich information of parts from production, quality inspection, and delivery to the factory can be recorded in one image. Then it expanded to the fields of automobile manufacturing, pharmaceutical medical treatment, military firearms management, etc., and it has a tendency to be promoted to other industries. DPM QR code is an important information source in the most popular Internet of Things technology. [0003] The DPM two-dimensional code is based on the two-dimensional barcode image as the main carrier. The two-dimensional barcode has the characteristics of...

Claims

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Application Information

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IPC IPC(8): G06K19/06
Inventor 王萍王娟王昭然
Owner TIANJIN UNIV
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