image annotation tool
select [file -> open image dir]
check [edit menu-> rectangle]
left click on image and drag.
check [edit menu -> contour] (after editing rectangle)
left click on image for the points.
click on the start point to create a loop.
shift : space key + left click + drag
rescale : space key + mouse scroll
save : click [save]
load : click left string of [save], and select directory
required