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Volume 33 Issue 09
Sep.  2007
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Journal of Beijing University of Aeronautics and Astronautics  > 2007  >  33(09): 1112-1116.
Huan Ji, Ma Weimin. Method for Calculating the Dynamic Path Error of NC Machine Tools Based on MATLAB[J]. Journal of Beijing University of Aeronautics and Astronautics, 2003, 29(4): 299-302. (in Chinese)
Citation: Zeng Lihua, Li Chao, Xiong Zhanget al. Precisely license plate locating algorithm based on edge and color information[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(09): 1112-1116. (in Chinese)
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Precisely license plate locating algorithm based on edge and color information

  • School of Computer Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 23 Aug 2006
  • Publish Date: 30 Sep 2007
    Abstract
  • A precise license plate locating algorithm was proposed combined with the mathematical morphology to solve the problems of existing locating algorithms such as low locating rate and slow speed. The algorithm was based on edge detection and color information. First color-image was preprocessed with grayscaling, smoothing and gray stretching and so on, then vertical edges detection and binarization were implemented on the image. After that linear filtering algorithm was adopted to filter disturbing edge lines, and up-down plate edges were located utilizing the characteristic of plate area′s variety in gray scales. Isolated points of the up-down edges located plate were filtered by using a point density filtering algorithm, then the plate area was located coarsely by finding connected components with adopting the mathematical morphology. Finally the plate was precisely located through color segmentation in HSV space and incline rectification. The experimental results show that this algorithm can locate the plate precisely and quickly.

     

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