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How can i find longest axis from mango shape object?

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Sabanam
Sabanam 2014-3-7
评论： Image Analyst 2014-3-10
In this image i want to crop only mango part.After then find the longest axis from mango shape and draw longest line from mango and calculate the length of the line.Based on the longest line value i can grade mango in large ,medium and small..Please help me as soon as possible.

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Image Analyst
Image Analyst 2014-3-7
See my image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Adapt it to use your image and to segment the mango somehow. Then call regionprops and ask for MajorAxisLength.
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