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No-chromatic-aberration marking character recognition method

A character recognition, no color difference technology, applied in the direction of character and pattern recognition, measuring devices, instruments, etc., can solve the problems of low character recognition accuracy and inability to apply industrial production, achieve accurate plane parameters, solve high-quality data collection and Effects of Data Processing Issues

Inactive Publication Date: 2017-10-24
CHANGCHUN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] There is no color difference between the engraved characters on the surface of the workpiece and the background of the workpiece surface. The traditional optical character recognition method is used to recognize them. The accuracy of character recognition is low and cannot be applied in industrial production.

Method used

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  • No-chromatic-aberration marking character recognition method
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Embodiment Construction

[0016] The implementation of the characters engraved on the shaft end of the train wheel is taken as an example to further describe the present invention below: as figure 1 Shown is a flow chart of the method of the present invention. The flowchart describes the steps of point cloud data processing from point cloud acquisition to character output.

[0017] The character information engraved on the axle end of the train wheel is as follows: figure 2 shown. Compared with traditional industrial characters such as printed characters, engraved characters are three-dimensional characters in space, and there is no color difference between the characters and the background, so it cannot be directly recognized by traditional optical character recognition methods. Therefore, the present invention utilizes the depth information of the characters engraved on the axle end of the wheel set to collect the depth image information of the engraved characters on the axle end through the line ...

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Abstract

The invention relates to a no-chromatic-aberration marking character recognition method. The method is characterized by comprising the following specific recognition steps: step 1, using a line structured light 3D sensor to scan point cloud data on 3D characters; step 2, using a total-least squares solution to establish a plane equation of initial point cloud data; step 3, using the plane equation fit in the step 2 to cut total point cloud data, determining points which are 0.3 mm lower than a plane in the point cloud data as points with character depth information, and reserving the points; step 4, displaying cloud of rest points from a normal direction of the plane, to obtain an image of the characters. Depth information of the marking characters is used, and depth image information is acquired through the line structured light sensor, and the method is combined with total-least squares plane fitting to complete extraction of character information in an image. The method is a no-chromatic-aberration three-dimensional character point cloud processing method based on a total-least square method.

Description

technical field [0001] The invention relates to a method for recognizing engraved characters without color difference, which is used in the field of recognition of industrial product marks. Background technique [0002] The surface of the machined workpiece usually has numbers and English letters processed by punches or lasers. These numbers or English letters are used to identify the production date, production batch, part name, part number, operator and other information of the workpiece. It is an important medium for production organization and management, product quality monitoring, product logistics tracking and after-sales traceability. [0003] The characters processed by the punch or laser on the surface of the workpiece are engraved on the surface of the workpiece compared with the spraying, printing characters or pasting paper labels on the surface of the workpiece. The characters engraved on the surface of the workpiece have a certain depth information, are three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/20G01B11/25
CPCG01B11/25G06V10/145G06V30/153
Inventor 张爽高金刚王华邢春齐
Owner CHANGCHUN INST OF TECH
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