Other important functions in OpenCV for image processing are related to filtering. These functions have been omitted in the chapter since they are straightforward. OpenCV includes an example that shows how to use the main filters ([opencv_source_code]/samples/cpp/filter2D_demo.cpp). The main filter functions are:
GaussianBlurfor a Gaussian filtermedianBlurfor a median filterbilateralFilterfor anisotropic filteringblurfor a homogeneous blur