thanks for the reply.
OpenCV doesn't necessarily need any sdks. In my console app, reading the image was with opencv, as it's simple and it reads variety of ímage files. Also smoothing and convolution is made with opencv, so I didn't need anything else (except fftw3).
No, I'm not that far that I could display anything yet, even opening a file is still obscured, but there are examples I can count on But there's so much things completetly new to me, so it takes time to learn upp, so an example would be nice.