Detection method for vehicle license plate real-time positioning character segmentation

A technology of character segmentation and real-time positioning, which is applied in character and pattern recognition, instruments, computer components, etc., and can solve problems such as high time complexity and low vehicle speed

Inactive Publication Date: 2010-07-28
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above method, there are strict restrictions on the working environment, such as limited to a static background, fixed light intensity, no tilt of the license plate, high resolution, low speed, etc., or the time complexity of the calculation is relatively high

Method used

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  • Detection method for vehicle license plate real-time positioning character segmentation
  • Detection method for vehicle license plate real-time positioning character segmentation
  • Detection method for vehicle license plate real-time positioning character segmentation

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Embodiment Construction

[0050] The method of the present invention is described in detail below in conjunction with accompanying drawing: present embodiment is implemented under the premise of technical scheme of the present invention, has provided detailed implementation and specific operation process, but protection scope of the present invention is not limited to following the embodiment.

[0051] Such as figure 1 As shown, for each video frame image, first preprocess, convert the color image into a grayscale image, and remove the color features; for different noise types, select a suitable filter for noise reduction; use the Hough transform to detect the tilt angle of the license plate , geometrically rotate the image to achieve skew correction.

[0052] In the edge detection process, the vertical edge concentration of the character area is considered, so only the vertical edge detection operator is used. Let the pixel at the coordinate position (i, j) be f(i, j) use the convolution kernel of t...

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Abstract

The invention relates to a detection method for vehicle license plate real-time positioning character segmentation in the technical field of video monitoring, which comprises the following steps of: obtaining a video frame from image acquisition equipment; carrying out image preprocessing; increasing a signal-to-noise ratio; carrying out grey scale transformation; computing a threshold value by adopting an Otsu binarization method and converting a vehicle image into a binary image; firstly carrying out closed operation by using a structural element with the size of length pixels, separating a communicated region at a fine position and smoothing burrs appearing on the edge of the region; carrying out contour detection; and carrying out license plate region accurate positioning: accurately segmenting out each character. The invention has lower requirements for image color, a large amount of system memory resources of a computer can not occupied, the operational speed is quickened after an input image is converted into a grey-scale image, the accurate position of each character can be rapidly found, and each character is segmented out by applying an image shearing method.

Description

technical field [0001] The invention relates to a license plate detection method in the technical field of video monitoring, in particular to a detection method for vehicle license plate real-time positioning character segmentation. Background technique [0002] The license plate recognition technology is the key technology to realize the intelligent transportation system, and the research on the license plate recognition has become a hot spot recently. The license plate recognition system (License Plate Recognition) has many applications in real life, such as electronic toll booths, access control, traffic flow monitoring and so on. Due to the large amount of data and high real-time performance requirements, if these occasions are still controlled by manual intervention, it will take up a lot of resources and the effect is not ideal. Therefore, providing a fast and accurate license plate recognition system connected to a database will greatly facilitate traffic vehicle man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/54
Inventor 邱友杰崔秋石周文玲孙敏庞溟舟
Owner SHANGHAI JIAO TONG UNIV
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