SIFT经LDA，然后二值化形成简短的特征，以提高匹配速度、减少存储量；该特征在Low False Positive 段，性能比SIFT好，但需要训练。-SIFT by the LDA, and then binarization formation of short features, in order to improve the matching speed, reduce the amount of storage the characteristics of the Low, Fal