foreground extraction in opencv using python

Question

I am trying to do foreground extraction(Grab cut algorithm) in open CV using python. I am using the code from the link . The code runs but everytime I am moving the mouse it is drawing a rectangle.

Problem: I cannot draw the touching strokes even after pressing the 0,1,2,3 keys as mentioned. Can someone please suggest how to come out of the rectangle mode and fix the rectangle after i release the mouse button.

I am new to open CV,any help would be appreciated

Answer 1

The code is structured very clearly. You might start by adding print statements in the onmouse method, in each of the

if event == ...

blocks, to figure out which events are correctly registered and which don't come through.