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| Title: | Automatic Detection of a License Plate by Using Wavelet Transform |
| Other Titles: | 使用小波轉換偵測車牌位置 |
| Authors: | 逄霖生
陳俞州
陳柏詮 |
| Contributors: | 工學院 |
| Keywords: | 對比
車牌偵測
數位影像處理
灰度
小波轉換
Contrast
License plate detection
Digital image processing
Graylevel wavelet transform |
| Date: | 2007-06-01 |
| Issue Date: | 2012-04-18 13:36:15 (UTC+8) |
| Abstract: | 自動車牌辨識是項有用的數位影像處理的應用。本研究探索使用小波轉換(wavelet Transform)來偵測車牌在一部靜止的車輛中的位置，我們利用車牌高對應比的特性，並用小波轉換將這些高對比的訊號分解為高頻的信號，這些資料的頂點代了對比的位置與差別，這些特性可偵測車牌。再水平與垂直的相鄰的映像點間，對資料加以計算與比較，高對比的區域應此可以被察覺，若符合條件，車牌的位置就可以找出，反之非車牌的區域則被剔除。
License plate recognition is a wide demanding image processing application. We have explored the possibility by using wavelet transform to detect the location of a license plate for non-moving vehicle. The license plate is designed to have high contrast differences which can be easily seen by human eyes. The decomposed high frequency component of wavelet transform extracts high contrast part of license plate. The large magnitude peaks of high frequency component indicate the edges of the foreground character and white background. We search these edges on the horizontal and vertical directions separately. By judging the similarity of neighboring pixels of edge points, we successfully detect the location of license plate. |
| Relation: | 華岡工程學報 21期 p.87 -92 |
| Appears in Collections: | [工學院] 學報-華岡工程學報
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