关键词: 车牌定位, 整型特征核, 差分, 高斯模糊, 混合高斯函数

Abstract: This paper?presents a fast, real-time?algorithm for vehicle license plate?location under complex background. The real-time and accuracy?are?the fundamental for the?license plate?recognition system. This paper proposes a special integer kernel and a difference algorithm for license plate location. Based on analyzing the hybrid Gauss function convolution method for license plate location, focusing on the higher computational complexity of the 2-dimension Gauss kernel, an improvement is made. Hybrid Gauss convolution is carried on directly after getting the vertical edge?map by sobel operation. A new integer kernel is proposed. and the convolution is replaced by the difference method in which a few addition operation is used instead of a large amount of float multiple operation. The paper compares location efficiency and time complexity for the two different methods. Experimental results illustrate that the proposed algorithm is effective for license plate location under complex background and can achieve?real-time?requirements.

Key words: license plate location, a special integer kernel, difference, Gaussian blur, mix-Gaussian function