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A license plate automatic detection method and device thereof

An automatic detection and license plate technology, applied in the field of visual inspection, can solve the problems of license plate surface damage, poor stability, and no fixed standards, so as to achieve the effect of improving efficiency and accuracy, low missed detection rate, and improving efficiency

Active Publication Date: 2021-07-13
常州三点零智能制造有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of issuing license plates, stamping license plates will cause damage to the surface of the license plate, and hot stamping license plates will cause defects in hot stamping characters and borders. These defects are currently mainly checked manually, and there is no fixed standard. Bad card data and good License plate data is easy to cause misclassification. The existing detection methods have poor stability for the same license plate detection, and the detection error rate is high; and the license plate detection itself does not require strict standards, and there are many types of license plate detection.

Method used

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  • A license plate automatic detection method and device thereof
  • A license plate automatic detection method and device thereof
  • A license plate automatic detection method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] As shown in Figure 3(a)-(c), an automatic license plate detection device includes a detection device installed on a workbench 1 and an industrial computer 4 connected to the detection device; the industrial computer 4 is the core of the detection device's calculations , the industrial computer 4 is installed with software programs for drawing, imaging, comparing, judging and outputting results. The industrial computer 4 is connected with the OK product display lamp 6, the NG product display lamp 7 and the buzzer 8 of the detection device, and the industrial computer 4 is also connected with a keyboard 2 and a display 3.

[0045] The detection device includes a frame 11, the outer cover of the frame 11 is provided with a protective cover 5, and the protective cover 5 is provided with an opening corresponding to the position of the test seat 14, which is convenient for putting in and taking out the license plate. An imaging module connected to the industrial computer 4 is...

Embodiment 2

[0049] As shown in Figure 4 (a)-(c), an automatic license plate detection device includes a detection machine 4-5 and an industrial computer 4 connected to the detection machine 4-5; the industrial computer 4 is arranged on the workbench 1, The industrial computer 4 is connected with a keyboard 2 and a display 3 .

[0050] The detection machine 4-5 has a frame 11 and a detection platform 4-7. The frame 11 is fixedly provided with an imaging module connected to the industrial computer 4. The imaging module includes a camera 9, a lens and a light source. The described The light source includes a first light source 10 and a second light source 12 , and the first light source 10 is arranged above the second light source 12 . The first light source 10 is a ring light source, which is the main light source; the second light source 12 is an auxiliary light source, and two symmetrically arranged bar light sources are used to form a symmetrical bar light source. The top of the detecto...

Embodiment 3

[0055] As shown in Figure 5(a)-(d), an automatic license plate detection device includes a frame 11, and the frame is provided with a loading module 5-2, an imaging detection module 5-3 and a lower Material module 5-4.

[0056] The feeding module 5-2 is a lifting mechanism, which is arranged under the imaging detection module 5-3 for vertical feeding; the lifting mechanism includes a lifting base plate 21, a plurality of vertical stop rods 22 arranged around the lifting base plate 21 and The driving device connected with the lifting base plate 21; the driving device is a stepper motor 23; a plurality of vertical retaining rods 22 form an upper feeding bin, and the license plates 13 to be tested are stacked and placed in the upper feeding bin in the form of a stack; the top of the vertical retaining rod 22 A proximity switch 25 is provided through the beam; the driving device drives the lifting bottom plate 21 to rise step by step.

[0057] The imaging detection module 5-3 inc...

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Abstract

The invention relates to an automatic license plate detection method and its device. The method is as follows: 1) feeding the material manually or by a material module at the loading station; And according to the imaging results, it automatically reads and detects the license plate to be tested through the detection algorithm; 3) judges whether the license plate to be tested is good or bad according to the results of the reading detection; the device includes a loading module, an imaging detection module, a blanking module; the loading module transmits the license plate to be tested to the bottom of the imaging detection module, and the imaging detection module takes pictures and performs reading detection; after the imaging is completed, the unloading module transports the license plate to be tested to the The corresponding silo; and according to the number of license plates to be tested in the silo, the material is unloaded. The invention effectively improves the efficiency of license plate detection, improves the efficiency and precision of license plate detection, has more accurate detection, lower missed detection rate, stronger applicability, and more license plate types and defect types to be detected simultaneously.

Description

technical field [0001] The invention relates to the technical field of visual detection, in particular to an automatic license plate detection method and a device thereof. Background technique [0002] In the process of issuing license plates, stamping license plates will cause damage to the surface of the license plate, and stamping license plates will cause defects in hot stamping characters and borders. These defects are currently mainly checked manually, and there is no fixed standard. Bad card data and good License plate data is easy to cause misclassification. Existing detection methods have poor stability in detecting the same license plate, and the detection error rate is high; and the license plate detection itself does not require strict standards, and there are many types of license plate detection. Contents of the invention [0003] The technical problem to be solved by the present invention is: to provide an automatic license plate detection method and its dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/34B07C5/02B07C5/36
CPCB07C5/02B07C5/34B07C5/36
Inventor 金伟国王岩松
Owner 常州三点零智能制造有限公司