局部HOG和分层LBP特征融合的车牌字符识别
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广东省自然科学基金(S2011040004273)


Fusion with Local HOG and Layered LBP Feature for License Plate Character Recognition
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    摘要:

    针对车牌字符识别中模板匹配法识别率低,尤其是无法准确识别相似字符的不足,提出了一种局部HOG和分层LBP特征融合的车牌字符识别方法. 首先利用模板匹配法对车牌所有字符进行初步识别,然后利用HOG算子提取车牌和模板相似字符中最具区分度的一小块边缘特征,接着利用LBP算子提取原始车牌和模板相似字符中相同区域块的分层纹理特征,将两种特征串行融合构建串行特征向量,最后根据特征向量之间的卡方距离来度量车牌字符和模板字符的相似性,进而完成二次识别. 通过实验比较了11种算法的识别性能,结果表明本文方法有效地解决了相似字符误识别的问题,在保证识别速率的同时识别率显著提高,达到99.52%.

    Abstract:

    In order to solve the low recognition rate of template matching method in license plate character recognition, especially the problem that the similar characters cannot be identified accurately, this paper proposes a method of license plate character recognition based on the fusion of local HOG and layered LBP feature. Firstly, we use the template matching method for preliminary identification of all the characters of license plate. Then, a small edge feature of the biggest difference in the similar characters of the license plate and the template is extracted by using HOG operator, and then the layered texture feature of the same area block of HOG in the similar characters of the original license plate and the template is extracted by using LBP operator. Next, serial feature vectors are constructed with serial fusion of the edge feature and the layered texture feature. Finally, according to the Chi square distance between the feature vectors, we measure the similarity of the license plate characters and the template characters, and then complete the second recognition. The recognition performances of the 11 algorithms are compared through experiments. The results show that this method is very effective to solve the problem of false recognition of similar characters and the recognition rate is improved significantly at the same time, which is as high as 99.52%.

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高聪,王福龙.局部HOG和分层LBP特征融合的车牌字符识别.计算机系统应用,2017,26(4):116-123

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  • 收稿日期:2016-07-11
  • 最后修改日期:2016-09-02
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  • 在线发布日期: 2017-04-11
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