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License plate inclination angle correction method based on Radon transform

A technology of inclination angle and license plate, applied in the field of image processing, can solve the problem of the inclination of the number plate of motor vehicles, and achieve the effect of improving the accuracy.

Inactive Publication Date: 2016-03-23
SICHUAN HAOTEL COMM
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  • Abstract
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Problems solved by technology

[0004] However, road cameras are mostly installed on the side of the road, and there is an angle for shooting motor vehicles, which will cause a tilt of the license plate of the motor vehicle in the photo

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  • License plate inclination angle correction method based on Radon transform
  • License plate inclination angle correction method based on Radon transform
  • License plate inclination angle correction method based on Radon transform

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Embodiment Construction

[0021] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0022] A line projected along its normal direction will have the longest projection, and a line parallel to it will have the shortest projection. Radon transform theory is such a projection theory. In this way it is possible to detect straight lines in an image.

[0023] Definition of Radon transformation: the projection of a binary function f(x,y) is the line integral in a certain direction, for example, the line integral of f(x,y) in the vertical direction is f(x,y) in the x direction The projection of the line integral in the horizontal direction is the projection in the y direction, and the line integral in the y' direction is the projection in the x' direction. Projection can be performed along any angle, usually the Radon transform of f(x,y) is the line integral of f(x,y) parallel to t...

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Abstract

The invention provides a license plate inclination angle correction method based on Radon transform, which relates to the field of license plate identification and is used for correcting identified inclined license plates. The license plate inclination angle correction method comprises the following steps: calculating a binary edge image of an image by using an edge function, and a detecting straight lines in an original image; calculating the Radon transform of the edge image, respectively projecting each point with a pixel 1 on directions of 0-179 degrees, calculating the Radon transform of the edge image, and displaying a transform effect picture; and detecting peak values in a Radon transform matrix, wherein these peak values correspond to the straight lines in the original image, the column coordinates theta of these peak values in the Radon transform matrix are the inclination angles of straight lines vertical to the straight lines in the original image, and the inclination angles of the straight lines are 90-theta.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for correcting the inclination angle of a license plate based on Radon transformation. Background technique [0002] In the past ten years, with the promotion of the Safe City project, cities at all levels in China have installed a large number of surveillance cameras on the roads and streets to assist the police in handling and solving cases. At the same time, with the widespread use of motor vehicles, the information of the motor vehicles involved in the case has also become an important clue to the case. [0003] Automatic detection and identification of motor vehicles on the road through the established Skynet cameras can bring great convenience to the public security and provide a rich source of data. [0004] However, most of the cameras on the road are installed on the side of the road, and there is an angle to the shooting of the motor vehicle, which wi...

Claims

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Application Information

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IPC IPC(8): G06K9/32G06K9/46
CPCG06V10/243G06V10/44G06V20/625
Inventor 胡晓芳
Owner SICHUAN HAOTEL COMM
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