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A method for deprivation of license plate image

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: 2018-04-27
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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  • A method for deprivation of license plate image
  • A method for deprivation of license plate image
  • A method for deprivation of license plate image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Adopt method 1 to realize deprivation of license plate image. Specifically: for a vehicle image containing a license plate with uniform illumination, non-cohesive license plate image characters, and a small (less than 3°) tilt angle of the license plate image, since the imaging conditions of each point in the license plate area are approximate, the entire license plate The gray value of pixels in the image area has similarity, especially the gray value of points of the same color has 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 visually impossible to distinguish the authenticity of the changed image. Under the regulations in "GA36-2007 Motor Vehicle Number Plates of the People's Republic of China", we can randomly combine (repeatable) numbers and letters in the same license plat...

Embodiment 2

[0052] Use method 2 to realize deprivation of the license plate image. Specifically: in the actual license plate, the numbers "6" and "9" are very similar in structure. After "6" is rotated 180°, it becomes "9". Similarly, after "9" is rotated 180°, it becomes "6". ". On the basis of method one, we can rotate the circumscribed rectangle of the number "6" or "9" by 180°, thereby changing the license plate information and achieving the purpose of removing privacy. figure 2 is a flowchart of the method.

Embodiment 3

[0054] Adopt method 3 to realize deprivation of the license plate image. Specifically: in the actual situation, the car and the license plate are the only corresponding relationship. Each car has a unique license plate number. If the size and inclination angle of the A license plate are changed to be the same as the B license plate, then the A license plate is placed on the B car. (car A is different from car B), it can also achieve the effect of removing the privacy of the license plate image. image 3 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 invention relates to the field of image privacy protection, in particular to a method for removing privacy of a license plate image for license plate recognition. Background technique [0002] With the continuous development of computer technology and electronic technology, the automation level of human life has been continuously improved. With the continuous advancement of Internet technology, more and more information can be monitored and obtained. Large-scale monitoring systems play an important role in controlling crimes. Played a strong positive role. However, while these information provide convenient services and all-round protection for human beings, some other problems also arise. In these public image information, how to prevent these information from being illegally used and preventing fraudulent incidents from happening. Data security risks, privacy protection has become a common concern and concern. Therefore, it is necessary to stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T2207/20021
Inventor 余志赵有婷江倩殷张格格何兆成
Owner SUN YAT SEN UNIV