SIFT算子计算旋转图的匹配点，python编写，仅供参考-SIFT operator calculate rotation graph matching points, python prepared for reference purposes only

通过标准形状的车牌作为模板，匹配车辆上的车牌，并框出车辆上的车牌。(Through the standard shape of the license plate as a template, matching the license plate on the vehicle, and frame the license plate on the vehicle.)