Marking the points by gpts on an image

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Jerry
Jerry 2013-9-10
I have to find the perimeter and area of an irregular objects using a GUI when reading the image. I have read the image in the GUI and then i have to select two reference points and a reference points from the keyboard i have done that already in the GUI using the ginput function where i have used two reference points. The figure can be downloaded from http://speedy.sh/zhAVF/irregularImage.JPG
Problem iam having is that i have to select the points on the irregular object using mouse which i will do through gpts command but i also have to outline those points on the figure, i am confused of how i will outline those points on the figure. Can you please help with that.

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