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題名:基於Hough轉換與Haar特徵串聯分類器的車牌偵測方法
書刊名:資訊、科技與社會學報
作者:謝禎冏張治強
作者(外文):Hsieh, Chen-chiungChang, Chih-chiang
出版日期:2013
卷期:21
頁次:頁21-33
主題關鍵詞:道路監控系統車牌偵測黑白特徵串聯分類器霍氏轉換Traffic surveillanceLicense plate detectionHaar featuresCascaded classifierHough transform
原始連結:連回原系統網址new window
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為了得到監視器畫面中車牌的資訊,我們提出一個系統來對車輛的車牌部份做偵測與定位,道路監控的畫面中,車子不會像停車場這種場合可以讓我們取得較好的畫面,所以面臨旋轉車牌影像的偵測是必須考量的。我們先利用黑白相間的Haar-like特徵訓練 cascaded分類器(Classifier),據以找出畫面中的車牌,並且框出車牌的位置。首先將運動物件以背景相減(Background Subtraction)與連通區塊(Connected Component Labeling)抽取出來,並對其做霍氏轉換(Hough Transform),找出旋轉角度,並將圖片校正。然後再以訓練好的分類器對校正過後的圖片作車牌偵測。我們提出的方法,以 314/394張車牌正 /負樣本做訓練,以 upright和skewed Haar-like特徵訓練出upright和skewed車牌分類器,再以860張影像做測試,實驗結果的偵測率達 87.4%,驗證本系統之可行性。對於水平旋轉所造成一般車牌分類器偵測不到車牌的情況,會有不錯的改善。
In this paper, we developed a system to automatically detect and locate license plates of vehicles. The vehicle in the real world traffic surveillance would have rotated license plate in the captured image. Due to the black-white patterns in the license plate image, cascaded classifiers using Haar-like features could be trained to detect license plate. If there is any vehicle extracted by background subtraction and connected component labeling, we can do Hough transform on the extracted vehicles for rotation correction. License plate of the corrected image could be then detected by the trained cascaded classifier. Our proposed system was trained with 314/394 positive/negative samples and tested with 860 vehicle images. The detection rate was 87.4% which demonstrated the feasibility of the proposed system.
期刊論文
1.Chiu, S. H.、Lu, C. P.、Wen, C. Y.(2006)。A Motion Detection Based Framework for Improving Image Quality of CCTV Security Systems。Journal of Forensic Sciences,51(5),1115-1119。  new window
2.Huang, Y. P.、Chen, C. H.、Chang, Y. T.、Sandnes, F. Eika(2009)。An intelligent strategy for checking the annual inspection status of motorcycles based on license plate recognition。Expert Systems with Applications,36(5),9260-9267。  new window
3.Viola, P.、Jones, M.(2004)。Robust real-time object detection。Int. J. Computer Vision,57(2),137-154。  new window
4.Wang, S. Z.、Lee, H. J.(2007)。A cascade framework for a real-time statistical plate recognition system。IEEE Transactions on Information Forensics and Security,2(2),267-282。  new window
5.Duda, R. O.、Hart, R. E.(1972)。Use of the Hough transform to detect lines and curves in pictures。CACM,15(1),11-15。  new window
6.Wen, C. Y.、Yu, C. C.、Hun, Z. D.(2002)。A 3-D transformation to improve the legibility of license plate numbers。Journal of Forensic Sciences,47(3),578-585。  new window
7.Guo, J. M.、Liu, Y. F.(2008)。License Plate Localization and Character Segmentation With Feedback Self-Learning and Hybrid Binarization Techniques。IEEE Transactions on Vehicular Technology,57(3),1417-1424。  new window
會議論文
1.Lai, C. H.、Wu, B. S.、Hsieh, C. C.(2010)。Adaptive road model for traffic safety applications。Information Technologies, Applications, and Management Conference,(會議日期: 2010/06/25)。高雄。  new window
2.Hsieh, J. W.、Yu, S. H.、Chen, Y. S.(2002)。Morphology-based license plate detection from complex scenes。IEEE International Conference on Pattern Recognition,176-179。  new window
3.Chen, B.、Cao, W. L.、Zhang, H. C.(2008)。An efficient algorithm on vehicle license plate location。IEEE International Conference on Automation and Logistics,1386-1389。  new window
4.He, X.、Zhang, H.、Jia, W.、Wu, Q.、Hintz, T.(2007)。Combining global and local features for detection of license plates in a video。Image and Vision Computing。New Zealand。288-293。  new window
5.Yanamura, Y.、Goto, M.、Nishiyama, D.、Soga, M.、Nakatani, H.、Saji, H.(200306)。Extraction and tracking of the license plate using Hough transform and voted block matching。IEEE Intelligent Vehicles Symposium,243-246。  new window
其他
1.Seo, N.。Tutorial: OpenCV haartraining,http://note.sonots.com/SciSoftware/haartraining.html。  new window
 
 
 
 
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