结合PCA的尺度不变特征变换(SIFT)算法，包含特征值与特征向量的提取、训练样本以及最后的识别，在MATLAB中求图像纹理特征。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, In the MATLAB