Abstract: In order to robustly locate vehicle license plate and correct tilt under different conditions, a novel approach for license plate location and tilt correction was proposed based on the feature matching of character. Considering that the primacy characteristic of the PRC license plates was Chinese characters, this approach got the Chinese character's position using standard Chinese characters of the PRC license plates based on feature matching. The Chinese character's position in the PRC license plates was fixed, thus, the proposed approach achieved license plate location and tilt correction using Chinese characters location. To demonstrate the effectiveness of the proposed approach, it conducted extensive experiments over a large number of real-world vehicle license plates. It reports that the proposed approach has high accuracy and robustness.

Key words: license plate location, tilt correction, feature matching, affine model

摘要： 为了在不同条件下对车牌进行定位与倾斜校正，提出了一种基于字符特征匹配的车牌定位与倾斜校正方法。该方法考虑到我国车牌首位字符为汉字的显著特征，利用标准车牌汉字库，采用特征匹配对车牌中的汉字进行定位。由于汉字在我国车牌中的位置严格固定，因此，对汉字的成功定位，也就实现了对整个车牌的定位与倾斜校正。对不同背景、不同光照条件下的车牌进行大量实验，结果表明该方法能够准确地进行车牌定位与倾斜校正，具有良好的鲁棒性。

关键词: 车牌定位, 倾斜校正, 特征匹配, 仿射模型