harris角点提取算法，可以设置高斯差分窗口大小、非极大值抑制的邻域大小、高斯函数方差大小-harris corner extraction algorithm, you can set the window size of the Gaussian difference, non-maxima suppression of the size of the neighborhood, the size of the variance of the Gaussian function

AEC库，回声抑制库，以至于webRTC源码。使用VS2013编译通过，头文件echo_cancelletion.h-AEC library, library echo suppression that webRTC source. Using VS2013 compiler, header files echo_cancelletion.h