Title :
One adaptive method of license plate location based on differential projection
Author :
Tang, Zhiwei ; Li, Wancai ; Shen, Dongqin
Author_Institution :
Lab. for Intell. Image Process., Third Res. Inst. Of Minist. Of Public Security, Shanghai, China
Abstract :
For the license plate image factored by the light and noise, this paper presents one adaptive method of license plate location based on differential projection. In this method, the first step is gray image processing and image enhancement, then use Sobel edge detection operator to detect plate edge. Followed by the iterative binary algorithm, the result is converted to binary edge map; and design a x shaped window adaptive median filter improved algorithm, effectively eliminate the interference; then calculate the value of differential projection for rough location. Finally, by the vertical projection after hough transform, the plate can located precisely.
Keywords :
Hough transforms; adaptive filters; edge detection; image enhancement; iterative methods; median filters; object detection; traffic engineering computing; Hough transform; Sobel edge detection; differential projection; gray image processing; image enhancement; iterative binary algorithm; license plate image; license plate location; one adaptive method; plate edge detection; vertical projection; x shaped window adaptive median filter; Algorithm design and analysis; Feature extraction; Image edge detection; Laboratories; Licenses; Security; adaptive; differential projection; license plate location;
Conference_Titel :
Electric Information and Control Engineering (ICEICE), 2011 International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-8036-4
DOI :
10.1109/ICEICE.2011.5777622
