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Method for correcting license plate slant based on rotating projection

A technology of tilt correction and rotation projection, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of character breakage and large error, and achieve the effect of small error, fast speed and good effect

Active Publication Date: 2016-04-13
NANJING FUJITSU NANDA SOFTWARE TECH
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Problems solved by technology

The least square method works well when the license plate characters are clear and not defaced, but for those license plates with defaced, broken characters, and low resolution, the error is larger

Method used

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  • Method for correcting license plate slant based on rotating projection
  • Method for correcting license plate slant based on rotating projection
  • Method for correcting license plate slant based on rotating projection

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Embodiment Construction

[0054] The inclination of the license plate has three modes: horizontal inclination, vertical inclination and horizontal and vertical inclination. In the license plate recognition, it is often not possible to make a corresponding single correction for the first two cases, but to consider the general mode of horizontal and vertical inclination. . The flow chart of calculating the tilt angle based on the rotation projection method is as follows Figure 4 shown.

[0055] Below in conjunction with accompanying drawing and embodiment, content of the invention will be further described:

[0056] refer to Figure 4 As shown, the license plate tilt correction method based on rotation projection finds the license plate area during the initial positioning, and takes the license plate image obtained after the initial positioning of the license plate as the input image, and performs the following steps on the license plate image:

[0057] Step 1: Grayscale

[0058] The color image is ...

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Abstract

The invention provides a method for correcting license plate slant based on rotating projection. The method is mainly used for rotating a license plate edge graph within a certain angle range (-30 to 30 in general) by means of the property that the projection variance of a standard license plate (i.e., having no slant) on the horizontal or vertical direction is maximal, and recording a projection value on the horizontal (vertical) direction of a new image after each rotation. The variance distribution of the size of the projection value obtained by each rotation angle is compared and analyzed, and the rotation angle with the maximal variance is the inclination angle of the license plate, so that an optimal rotation angle on the horizontal (vertical) direction can be determined. The defects of an unsatisfactory detection effect, an unsatisfactory result in an application scene with high instantaneity, low algorithm reliability and a relatively large error in the prior art are avoided.

Description

technical field [0001] The invention belongs to the technical field of license plate tilt correction, in particular to a method for license plate tilt correction based on rotational projection. Background technique [0002] In the license plate recognition system, due to the installation angle of the camera and the driving conditions of the vehicle, the collected license plate image will inevitably have a certain inclination. The tilted license plate image will cause the characters to tilt, which will affect the correct segmentation of characters and the accuracy of character recognition. Therefore, it is necessary to correct the tilted license plate. The prerequisite for correction is to calculate the tilt angle of the license plate. In general, inclined license plates mainly show three situations: horizontal inclination, vertical inclination and horizontal and vertical inclination. Respectively as figure 1 , figure 2 and image 3 As shown, the existing license plate...

Claims

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Application Information

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IPC IPC(8): G06K9/32
CPCG06V10/245G06V20/62G06V30/1478
Inventor 蔡志旻娄刚刘伟许焱韦树艺
Owner NANJING FUJITSU NANDA SOFTWARE TECH
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