Extract object from black background OpenCV C++

Question

First you have to know that I work with OpenCV in C++ in Visual Studio.

I have a picture like : Original image

I want to create a new picture of the hand but with a lot less of black bacground. So the final image should look like this : Final Image

I know there are some OpenCv functions that could help me but I have really trouble to implement the algorithm because OpenCv can't be used in Debug Mode so it hard to check what I am doing.

Have anyone any idea how to proceed ?

Thanks you very much.

Answer 1

Find contour, find bounding rectangle, crop.

Here is example of finding bounding box: example