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Study and Implementation of Vehicle License Plate Location and Character Segmentation

Author: LiGuoLi
Tutor: DuanShan
School: Central South University for Nationalities
Course: Applied Computer Technology
Keywords: Binarization Edge Detection Mathematical Morphology License Plate Location Character segmentation
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 93
Quote: 1
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Abstract


The vehicle license plate recognition is the key technology in intelligent transportation systems . Traveling in highway fees, vehicle detection , parking control and management , road vehicle monitoring and other fields has a broad application prospects . In this paper, the vehicle license plate recognition system of car license, location and character segmentation study include: image preprocessing, license plate location and character segmentation . First, image pre-processing , gray , gray stretch , binarization , edge detection and other aspects of the image , respectively . Collected images of gray and gray-scale histogram equalization to change the contrast of the light is not an ideal situation caused too large or too small effect on the image . Then in terms of image binarization using Otsu algorithm for image binarization , the second value of good results . Depth analysis commonly used in image pre-processing edge detection operator and use Sobel operator edge extraction as the operator . Secondly , the license location algorithm . The first commonly used method of license plate location , then the license plate location method based on mathematical morphology and geometry characteristics combined . The method uses the the closed opening operation of mathematical morphology license character regions into separate connected domain , and the geometric characteristics of the license : the width and height proportions and size range to achieve the exact location of the license plate . The experimental results show that this positioning method accuracy is higher , run faster . Finally, the research license character segmentation . Positioning license pretreatment including license inclined angle correction and borders and rivets removed. Character segmentation , the vertical projection of the segmentation in the segmentation process with reference to the number of the license plate characters and the width and height of the character and the character interval between to split , and these parameters gives a viable the range of values. The experimental results show that the effect of such a character segmentation method is accurate , especially adhesions or the noise exists between the characters on the license plate , can also play a better segmentation results .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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