Hi, I tried compiling and installing opencv 3.1 on my Ubuntu box. After the installation I was trying to create a custom filter using the cv::BaseFilter class. But I cannot find the necessary include file for that. Right now I'm including <opencv2/imgproc/imgproc.hpp>. I noticed that there is filterengine.hpp in the source files used for opencv compilation, but I cannot find the same file in the /usr/local/include/opencv2 installation directory. Is this the right include? If yes, how can I install after compilation? Thanks.