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一种基于小波与形态学的车牌图象分割方法
引用本文:戴青云,余英林.一种基于小波与形态学的车牌图象分割方法[J].中国图象图形学报,2000,5(5):411-415.
作者姓名:戴青云  余英林
作者单位:华南理工大学通信与电子工程系!广州510641,广东工业大学电子与信息工程系,广州510643,华南理工大学通信与电子工程系!广州510641
基金项目:国家自然科学基金项目!( 69772 0 2 6),广东省高教厅重点项目!( 990 0 49)
摘    要:针对汽车车牌与车身背景的分割问题,给出了一种基于小波分析和数学形态学的图象分割方法。该方法是通过小波多尺度分解提取出纺理清晰,具有不同空间分辨率、不同方向的边缘子图象。其水平方向低频、垂直方向高频的这一细节分量,主要代表车牌的目标区域。然后,用数学形态学方法对小波分解后的细节图象进行一系列的形态运算,进一步消除无用信息和噪声,以找准车牌位置。用该方法对在不同照明条件下所采集到的一系列车头、车尾图象

关 键 词:车牌图象分割  小波变换  数学形态学  模式识别
收稿时间:1999/7/12 0:00:00
修稿时间:1999-07-12

A Kind of Segmentation Method of Vehicle-License-Plate ImagesBased on Wavelet and Mathematical Morphology
DAI Qing-yun and YU Ying-lin.A Kind of Segmentation Method of Vehicle-License-Plate ImagesBased on Wavelet and Mathematical Morphology[J].Journal of Image and Graphics,2000,5(5):411-415.
Authors:DAI Qing-yun and YU Ying-lin
Institution:Dept.Of Comm.and Elec.Engineering,South China University of Technology,Guangzhou 510641;Dept.Of Elec.and Info.Engineering,Guangdong University of Technology,Guangzhou 510643;Dept.Of Comm.and Elec.Engineering,South China University of Technology,Guangzhou 510641
Abstract:In this paper, a kind of practical image segmentation algorithm for segmenting the license plate from its vehicle body background is presented, based on wavelet multiscale analysis and mathematical morphology. By multi resolution analysis and pyramid decomposition, the edge components with different spatial resolutions and different directions can be acquired, among which, the horizontal low frequency and vertical high frequency component has the most distinguished texture feature standing for the object region of the license plate. Then by further morphological operations, the noise in these edge components can be greatly decreased and the locations of the license plates can be also accurately determined. We have completed a series of experiments under different conditions. The experiment results show that the segmentation effects and it's orientation accuracy are improred significantly, so the proposed method is very effective for segmenting and locating noisy vehicle license plates.
Keywords:Vehicle  license  plate image segmentation  Wavelet    Mathematical morphology
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