I'm trying to run the attached code, and I'm getting errors about the objects of the class Mat. I tried adding the file Mat.hpp to the code and it didn't help. though the code itself isn't problematic- other pepole on that forum used it and it worked. so I guess something's wrong with how I'm using the class or with how I'm using openCV in general. If someone can guide me I'll be very happy. Thank you very much!!!