I used Opencv to scale an image (1400*750, U8C1). It took about 10ms, which is a bit slow. I found that Intel IPPI can precompute the ResizeFilter and then perform the resize operation much faster. When the same resize operation is performed on the next time, the calculation of ResizeFilter can be avoided. So, can opencv precompute the ResizeFilter to speed up resize operation like Intel IPPI.