How to learn opencv and what you need to know for this?

Question

C++ / C#

Where to find materials in Russian related to opencv.
How to install opencv on visual studio, and is it necessary?
How opencv finds objects, how to attach a camera or something else.
How people create balance boards and combine with Arduino.
I know how to use Google, but there is no normal information, only how to install ...

Answer 1

OpenCV is a tool for those who already understand how image processing works, what is color, pixels, filters, FFT, Hough transforms, and so on.
I think it's better to start by understanding these issues, and OpenCv will follow by itself.