基于卷积神经网络的双行车牌分割算法
Double-Row License Plate Segmentation with Convolutional Neural Networks
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摘要: 随着智能化交通的迅速发展,自动车牌识别技术不断提高.现有大多数车牌识别技术能较好识别单行车牌字符信息,但双行车牌识别准确率较低且支持中文双行车牌的识别算法更少.为了有效地将原本仅支持单行车牌识别的算法扩展到双行车牌识别,提出一种基于卷积神经网络(CNN)的双行车牌分割算法,首先利用CNN提取车牌图像特征;然后利用特征训练多标签分类模型,将双行车牌分割为2个单行车牌.文中还构建了一个包含20多万幅中国车牌图像的数据集.基于此数据集的实验结果表明,文中算法对双行车牌自动分割准确率较高,有效地提高了双行车牌识别准确率.Abstract: With the fast development of intelligent traffic,the license plate recognition technology progressively improves.Most of existing license plate recognition techniques can well recognize character information for singlerow license plates but the recognition accuracies for double-row license plates are not ideal and even less algorithms support Chinese characters.This paper introduces a doublerow license plate segmentation method with CNN,enabling efficient double-row license plate recognition for originally single-row recognition algorithms.First,this method trains a multi-label classification model with the image features extracted using CNN.Then,we use the model to automatically segment a double-row license plate into two single-row license plates.In addition,we have constructed a training and validation dataset containing more than 200 000 Chinese license plate images.The experimental results show that the proposed method has a higher accuracy in automatic segmentation of double-row license plate,thus effectively improving the accuracy of double-row license plate recognition.