opencv实现两幅图帧差,两幅图片进行相应像素的差运算，根据阈值可以确定输出值，归零或2-Achieve frame difference of two images .Two photos of corresponding pixels difference operation, according to the threshold can determine an output value, zero or 255

基于邻域灰度梯度的改进二维OTSU算法：在二维OTSU的方法上进行改进，将纵坐标改用像素点的灰度值与其邻域的平均灰度值的差的绝对值，分割图像。-Neighborhood-based two-dimensional gray-scale gradient improved OTSU algorithm: to improve on the two-dimensional OTSU method, the vertical axis instead of the absolute value of