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Inverse transformation method and system of perspective images

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: 2015-11-11
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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Embodiment Construction

[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0037] See figure 1 What is shown is an embodiment of a method for inverse transformation of a 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, the original X coordinate, and the original Y coordinate of each pixel of the perspective image of the object, and obtain the angle between the imaging target surface and the normal of the photographed surface of the object, and the photographing device used...

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Abstract

The invention relates to an inverse transformation method and system of perspective images. In license plate recognition application at the entrance of a parking lot, license plate images photographed by a photographing device are perspective images which are deflected and deformed due to limitations of actual environment. According to the inverse transformation method and system of the invention, an X-coordinate and Y-coordinate inverse transformation formula can be obtained through derivation according to a lens imaging geometric law of an object, and a geometric law when an included angle exists between the normal of a photographed surface of the object and an imaging target surface, and as a result, the coordinate point of each pixel after transformation can be obtained, and therefore, the perspective images can be reduced to similar images of the original object, and the success rate of vehicle license plate recognition can be improved.

Description

Technical field [0001] The invention relates to an image conversion method, in particular to an inverse conversion method of a perspective image. Background technique [0002] In the application of license plate recognition at entrances and exits of parking lots, due to the limitations 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 passages. Therefore, the imaging target surface and the license plate plane often exist when shooting. With the included angle, the captured perspective image of the license plate will inevitably undergo trapezoidal deformation, which greatly reduces the success rate of license plate recognition. Summary of the invention [0003] Based on this, it is necessary to provide a method and system for inverse transformation of perspective images for the low success rate of camera license plate recognition. [0004] A method...

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Application Information

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