一个实现视频关键帧提取算法的类，用C++实现，基本思想还是双阈值方法-A class which realize the algorithm to check out the key frame of video is written by c++. The basal idea of the algorithm is based on double threshold.

图像边缘检测(Canny 算法)的Java实现 Canny边缘检测算法 step1:用高斯滤波器平滑图象； step2:用一阶偏导的有限差分来计算梯度的幅值和方向； step3:对梯度幅值进行非极大值抑制； step4:用双阈值算法检测和连接边缘 -Edge Detection (Canny algorithm) to the Java Canny edge detection algorithm ste p1 : Gaussian smoothing filte