I= imread('coins.png');
I = bwareaopen(bwmorph(im2bw(I), 'close'), 50);
s = regionprops(I, 'Orientation', 'MajorAxisLength', ...
'MinorAxisLength', 'Eccentricity','Centroid');
imshow(I)
s(1).MajorAxisLength
returns 60.0507 which is the length (in pixels) of the major axis of the ellipse How to convert this length into cm?
If you know the size of the pixel in the real world (pixel spacing), it is straightforward, just multiply the length in pixel for you pixel size. In case you don't, you should do some calibration with an object of known size.
If the input image used was in DICOM format, you can get the size of the pixel using pixel-spacing tag; otherwise, if you know the scanner resolution (dots per inch), based on which you can compute the distance in the required SI unit.
Regards,
Dr.Giri
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