Find Area of the object in mm^2 from binary image

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Alina tom 2018-9-27

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编辑： Angelo 2024-4-19

Hi All, I have two questions related to each other. I have a binary image and I want to calculate the area of the object in mm^2. I have calculated the area in pixel by using this code

   [B,L] = bwboundaries(Bw,'noholes');
   stats = regionprops(L,'Area','perimeter');
   area = [stats.Area];

but I don't know how I can convert this in mm^2.

here is my original image in cartesian coordinate and size is 512 x 512.

I have converted the image in polar coordinate , its size is 256x256 . here it shown

can I calculate the length of the line in mm^2. can anybody please help me . Thanks in Advance

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jonas 2018-9-27

The length of the line in mm^2?

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Guillaume 2018-9-27

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Unless you know the scale of your image (pixels/mm) it is impossible to convert pixel measurements such as area or perimeter to rea world physical units such as mm^2.

You would know the scale of your image either by knowning carefully measuring or calculating the magnification of your imaging system or by capturing an image of an object of known dimensions (under the same imaging conditions).

If you have done neither of these, you're out of luck.