reconstruction drawing sequence from video I have a video that record the drawing sequence with a pencil by a painter.


I want to reconstruction the sequence from the video.
And I have google some keywords like drawing sequence reconstruction, sketch reconstruction, and have searched like moving object detection but cannot found what I want to find.

I want to know how to detect and recognize the drawing between different frames. I have thought the line detect algorithm may work but fail. And pixel comparison seems to be bad idea. Because that the new drawing may overlap the old ones. 

Could you give me some information that I can read or some keywords to search? Sorry about that because I am not familiar with Computer Image Processing.
This is more a Computer vision question I think.
I don't know how exactly you can achieve that but some ideas and keywords you may use to find additional resources:

Feature tracking of hand and pen can yield the movement of said things. Assuming you know that the camera is not moving I think that would give you good results. Related is maybe motion tracking. Any information you have about the hand and the camera can in some way be used to make more accurate estimates.

Removing the hand from the video could be much harder. I don't remember that part from my lecture. We copied parts of the image onto the part we want to remove and used image metrics to make sure it fits best possible... But since the hand covers a drawing we don't know much about this could be very hard to do in an convincing way.