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Current code throw an exception error when cursor is moved in the "placeholder" area. It can be fixed by updating the if condition on line 12:

FROM:
LINE 12: if( event == EVENT_MOUSEMOVE)

TO:
LINE 12: if( event == EVENT_MOUSEMOVE and (x<img.rows and y<img.cols))

Current code throw an exception error when cursor is moved in the "placeholder" area. It can be fixed by updating the if condition on line 12:

FROM:
LINE 12: if( event == EVENT_MOUSEMOVE)

TO: 
LINE 12: if( event == EVENT_MOUSEMOVE and (x<img.rows and y<img.cols))
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