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lock the mask on the selected area

I have a low quality video .... my intent is to bring a frame, manually draw a circle or other sort of mask around an object, and make sure that the drawn mask remains positioned above the object for the duration of the video. Unfortunately, the framing of the video moves a lot and this is the problem. It may be that the maskere on the screen are more than one. .... Below an example of a captured frame and the drawn mask .... THE QUESTION: any one can suggest my the best strategy to make these thigs?

My code is c++14 & linux.

image description

lock the mask on the selected area

I have a low quality video .... my intent is to bring a frame, manually draw a circle or other sort of mask around an object, and make sure that the drawn mask remains positioned above the object for the duration of the video. Unfortunately, the framing of the video moves a lot and this is the problem. It may be that the maskere on the screen are more than one. .... Below an example of a captured frame and the drawn mask .... THE QUESTION: any one can suggest my the best strategy to make these thigs?

My code is c++14 & linux.

image description

UPDATE: Sorry. I forgot to add that the real-time features are useful. About my test: I Try to add a color mask as example in the image and than trak the coloured feature with a std colour traking ... but the result is not so roboust.