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License plate image privacy removal method

A license plate image deprivation technology, which is applied in the license plate image deprivation field of license plate recognition, can solve problems such as algorithm development or testing problems, and achieve the effect of privacy protection

Active Publication Date: 2016-01-13
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods currently used mainly include: mosaic method, shutter effect, artistic effect, etc. The main idea is to make the image blurred, but for license plate recognition developers or testers, doing so will eliminate or weaken the license plate. The characteristics of the image itself, which brings some troubles to the development or testing of the algorithm

Method used

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  • License plate image privacy removal method
  • License plate image privacy removal method
  • License plate image privacy removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Use method 1 to realize the privacy of the license plate image. Specifically: For a vehicle image containing a license plate with uniform illumination, no adhesion of the license plate image characters, and a small inclination angle of the license plate image (less than 3°), since the imaging conditions of each point in the license plate area are similar, the entire license plate The gray values ​​of pixels in the image area have similarity, especially the gray values ​​of points of the same color have continuity and similarity. Based on the above theory, if the pixels of the same color in the image are replaced with each other, the formation of a new image will basically not change the imaging properties of the original image, and it is impossible to visually distinguish the authenticity of the changed image. We can combine numbers and letters in the same license plate image at will (repeatable) to form a new license plate image under the provisions of "GA36-2007 People...

Embodiment 2

[0056] Method 2 is adopted to realize the privacy of the license plate image. Specifically: in the actual license plate, the numbers "6" and "9" are very similar in structure. When "6" is rotated 180°, it becomes "9", and the same when "9" is rotated 180° is "6". ". On the basis of Method 1, we can rotate the circumscribing rectangle of the number "6" or "9" by 180° to change the license plate information and achieve the purpose of privacy. figure 2 It is a flowchart of the method.

Embodiment 3

[0058] Method 3 is adopted to realize the privacy of the license plate image. Specifically: in the actual situation, the car and the license plate are the only corresponding relationship, and each car has a unique license plate number. If the size and inclination angle of the A license plate are changed to the same as the B license plate, then the A license plate is placed on the B car On (car A is different from car B), you can also achieve the privacy effect of the license plate image. image 3 It is a flowchart of the method.

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Abstract

The invention discloses a license plate image privacy removal method, wherein any one or combination of a mode 1, a mode 2 and a mode 3 is used for realizing privacy removal for a license plate image. The mode 1 comprises the following steps of: obtaining a checkpoint crossroad vehicle image; extracting a license plate image of a vehicle; segmenting out character images in the license plate through standard rectangular frames; rearranging the character images in the standard rectangular frames, and obtaining a new license plate image. The mode 2 comprises the following steps of: obtaining the checkpoint crossroad vehicle image; extracting the license plate image of the vehicle; segmenting out the character images in the license plate through the standard rectangular frames; rotating an exterior rectangular frame of a figure '6' or '9' in the license plate 180 degrees, thereby obtaining the new license plate image. The mode 3 comprises the following steps of: obtaining images of checkpoint crossroad vehicles A and B; extracting the license plate images of the vehicle A and the vehicle B; modifying size and angle of inclination of the license plate of the vehicle A, thereby making the license plate of the vehicle A consistent with the license plate of the vehicle B; and using the modified license plate image of the vehicle A for the vehicle B, and obtaining a new license plate image of a vehicle C.

Description

Technical field [0001] The present invention relates to the field of image privacy protection, and more specifically, to a method for removing privacy of license plate images for license plate recognition. Background technique [0002] With the continuous development of computer technology and electronic technology, the automation level of human life is constantly improving. With the continuous advancement of Internet technology, more and more information can be monitored and obtained. Large-scale monitoring systems are used in crime control. Played a powerful positive role. However, while providing convenient services and comprehensive protection for human beings, this information also creates other problems. In the public image information, how to prevent this information from being illegally used and prevent the occurrence of fraud incidents? Face the actual existence. The data security risks in the world, privacy protection has become a common concern and worry. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T2207/20021
Inventor 余志赵有婷江倩殷张格格何兆成
Owner SUN YAT SEN UNIV