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Method and system for inverse transformation of perspective image

An inverse transformation and image technology, applied in the field of image transformation methods, can solve the problem of low success rate of camera license plate recognition, and achieve the effect of improving the success rate

Active Publication Date: 2019-01-11
GUANGDONG ANJUBAO INTELLIGENT CONTROL SYST
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Problems solved by technology

[0003] Based on this, it is necessary to provide a method and system for inverse transformation of perspective images to solve the problem of low success rate of camera license plate recognition

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  • Method and system for inverse transformation of perspective image
  • Method and system for inverse transformation of perspective image
  • Method and system for inverse transformation of perspective image

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0037] see figure 1 Shown is an embodiment of the inverse transformation method of the perspective image of the present invention. Such as figure 1 As shown, the inverse transformation method of the perspective image in this embodiment includes the following steps:

[0038] Step S101: Obtain the pixel value, original X coordinate, and original Y coordinate of each pixel point of the perspective image of the object, and obtain the angle between the imaging target surface and the normal of the surface of the object to be photographed and the angle of the photographing de...

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Abstract

The invention relates to an inverse transformation method of perspective images. In the application of license plate recognition at the entrance and exit of a parking lot, due to actual environmental limitations, the license plate image captured by the shooting device is often a perspective image with deformation. This invention derives the inverse transformation formulas of X coordinates and Y coordinates based on the geometric rules of lens imaging of objects and the angle between the normal line of the photographed surface of the object and the imaging target surface, and obtains the transformed coordinate point of each pixel. , the perspective image is restored to a similar image of the original object, which improves the success rate of license plate recognition.

Description

technical field [0001] The invention relates to an image conversion method, in particular to an inverse transformation method of a perspective image. Background technique [0002] In the application of license plate recognition at the entrance and exit of the parking lot, due to the limitation of the actual environment, the camera gun cannot be installed directly in front of the license plate, but can only be installed on the left and right sides or above the entrance and exit passage, so the imaging target surface and the license plate plane often exist when shooting If the included angle is too small, the perspective image of the license plate will inevitably undergo trapezoidal deformation, which greatly reduces the success rate of license plate recognition. Contents of the invention [0003] Based on this, it is necessary to provide a method and system for inverse transformation of perspective images for the problem of low success rate of camera license plate recogniti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00
CPCG06T3/04
Inventor 李仲生李奕富黄小金
Owner GUANGDONG ANJUBAO INTELLIGENT CONTROL SYST