I want the segmented area bounded inside by the green boundary. How can I get it?
MATLAB: How to segmented the attached image
areaimage segmentationMATLABperimeter
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Definitely not edge detection. What I'd do is use the Color Thresholder App on the Apps tab of the tool ribbon and segment in HSV color space. Then export the function to create a mask. Then you can use bwareafilt() to extract the largest blob or blobs of certain sizes.
[EDIT]
OK, since a lot of time has gone by and you still haven't responded, I'm assuming you couldn't quite get it. So I'm attaching a script that gives you the area.
area = 35389 pixels
Adapt as needed.
Which leaf? There are lots of leaves in that image, and they're all green. That's the problem. So you can either hand trace the leaf with imfreehand(). Demo of imfreehand are attached below in blue.
Or you can try texture segmentation because the giant leaf has a different texture than the "background" leaves. You can use stdfilt or entropyfilt() to do texture segmentation.
Once you've processed it to a point where you can threshold it then you can use regionprops, as shown in my image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 I also have color segmentation demos there but since all your leaves are so close in color, that probably won't work.
Finally, to get a "real world" area, instead of pixels, you'll need to spatially calibrate and I attach my demo (below in blue) to show you how to do that.
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