Image processing. What is the best library to choose?

Question

C++ / C#

I know there is openCV. But are there other more lightweight libraries for very simple tasks?
It is necessary to select the background from the object.
And if for example already video processing. Can this be considered as image processing if processed frame by frame?

Answer 1

It is a video and so it is processed frame by frame. If for simple i.e. libgd https://libgd.github.io

Answer 2

There is also dlib. It is header only.
PS Separating the background from the object is far from an easy task.