自适应滤波算法（Adaptive filtering algorithm）.doc

自适应滤波算法（Adaptive filtering algorithm） Received date: 1998-12-29 Supported by the Youth Foundation of Guangdong University of Technology (962029) Author profile: 1965-, female lecturer, main research interests: image processing and pattern recognition Application of adaptive filter in license plate image preprocessing Qing Yun Dai (Department of electronic and information engineering, Guangdong University of Technology, Guangdong, Guangzhou 510643) Abstract: according to the gray characteristics of the license plate image, a linear adaptive algorithm is adopted to enhance the license plate image, aiming at removing the noise, Experimental results show that the improved two valued image quality is improved obviously Law is effective Keywords: two-dimensional adaptive filtering; LMS algorithm; two valued; enhancement; image processing CLC number: TN911, document identification code: A, article number: 1007-7162 (1999) 03-0034-05 1, the question raised Using image processing technology to recognize the license plate number of all kinds of motor vehicles is a very important problem in modern traffic management Research topic: automatic identification of license plate number is very important in automatic toll collection and effective prevention of illegal vehicle stamping Practical significance In order to extract the location information of the license plate and the shape information of the license plate number, the vehicle number is first recognized before the license plate number is recognized Brand image for two value processing. In the expressway automatic toll collection system, CCD industrial TV camera is usually used to obtain the map Image obtained in the target image contains rich natural background and body background information, and is easily affected by lighting conditions (daytime and black) Weather conditions (overcast, rain, fog, snow) and the effects of motion distortion and blur, so the quality of the acquired images is generally poor, The effect of tw