How can i find the diameter of a region?

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Carole
Carole 2012-11-5
评论： Image Analyst 2017-4-23
Hi, I have a region of interest detected by a segmentation method. I want to find the diameter of this region in millimeter. How can i do this with matlab? This is the mask of the region
Thanks
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diksha lade
diksha lade 2017-4-23
simple code for feature extraction last stage of our project
Image Analyst
Image Analyst 2017-4-23
Wow - surprised that could be his master's. I wouldn't have even let it get past the journal review process. For one thing it was published in 2014 and does nothing new - it merely applies the standard ABCD skin cancer method that's been around at least 20 years, without inventing anything new. And it didn't even show results. And it does dumb and potentially harmful stuff like histogram equalization - a useless thing that novices usually incorrectly think needs to be done (probably second only to edge detection in their desire to do something even if it's unnecessary). And it doesn't even do color calibration. The asymmetry measure he's using is the Sorensen-Dice coefficient as I mentioned and discussed in Wikipedia: https://en.wikipedia.org/wiki/S%C3%B8rensen%E2%80%93Dice_coefficient#cite_note-11 That said, feel free to replicate his work and implement the ABCD method.

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回答（1 个）

Image Analyst
Image Analyst 2012-11-5
regionprops() has an 'EquivDiameter' measurement that you can ask for. See my Image Segmentation Tutorial "BlobsDemo" in my File Exchange if you want a demo.
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Carole
Carole 2012-11-6
thanks, it works I have the same result. It works even with a region having an irregular shape?? How can i convert the result given in pixel to millimeter??
Image Analyst
Image Analyst 2012-11-6
Yes it works for any shape. To spatially calibrate you need to know how many pixels correspond to a millimeter. Try imaging an object of known size and measuring it.

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