一些有关SIFT衍生算法的资料，包括ASIFT, CSIFT, PCA-SIFT, SURF算法，中英文都有，很有价值-Some of the SIFT algorithm is derived, including ASIFT, CSIFT, PCA-SIFT, SURF algorithm, in each category, great value

sift 改进增加了对颜色的补偿，csift算法-Csift detailed algorithm, avoid to sift the limitations of color images

sift算法实现，可以实现图像的配准，大量的特征点的寻找(siftThe implementation of sift algorithm can achieve image registration, a large number of feature points)