结合PCA的尺度不变特征变换(SIFT)算法，使用拉亚普诺夫指数的公式，车牌识别定位程序的部分功能，有循环检测，周期性检测，与理论分析结果相比，包含特征值与特征向量的提取、训练样本以及最后的识别。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Raya Punuo Fu index using the formula, Part of the license plate recognition locator feature, There are cycle detection, periodic testing, Compared with the results of theoretical analysis, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition.