Sift implementation with opencv, this method Applys David Lowe s Scale Invariant Feature Transform (SIFT) algorithm to a grayscale image. -Sift implementation with opencv, this method Applys David Lowe s Scale Invariant Feature Transform (SIFT) alg

HOG即histogram of oriented gradient, 是用于目标检测的特征描述子，该技术将图像局部出现的方向梯度次数进行计数，该方法和边缘方向直方图、scale-invariant feature transform类似，不同的是hog的计算基于一致空间的密度矩阵来提高准确率。Navneet Dalal and Bill Triggs首先在05年的CVPR中提出HOG，用于静态图像or视频的行人检测。-HOG i.e. histogram of oriented gradien

SIFT，即尺度不变特征转换（Scale-invariant feature transform，SIFT）-Scale-invariant feature transform，SIFT

open cv的sift尺度不变特征变换C代码源码，效果还不错，分享给大家学习-open cv sift the scale invariant feature transform source code for C, the results were good, for everyone to share learning