EquivDiameter calculates the diameter of a circle . The result diameter is in mm or cm or other. Could you please answer if you know? Thanks all.

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Khaing Zin Htwe
Khaing Zin Htwe 2016-4-27
评论： Image Analyst 2016-4-27
Hello my seniors, EquivDiameter in regionprops calculates the diameter of a circle . The result diameter is in mm or cm or other. Could you please answer if you know? Thanks all.

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Image Analyst
Image Analyst 2016-4-27
It's in pixels. If you want in real world units, you have to determine a calibration scaling factor to convert pixels to real world units, like in my attached demo.
  2 个评论
Image Analyst
Image Analyst 2016-4-27
What can possibly be easier than multiplying by a scalar?
distanceInCm = distanceInPixels * cmPerPixel;
That's as easy as it gets. You just have to know or figure out what cmPerPixel is. That's what the demo does - it asks you to click on a know distance in the image and asks you the number of real world units for it.
If you already know from other means what cmPerPixel is, then just simply do that multiplication. Really, take another look, it's actually an easy process.

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