MATLAB: Diameter of image (1024×1024 logical value)

diameterImage Processing ToolboximshowMATLABpolarplot

Hello I have a 104×1024 logical.

when i use imshow(figure) to display it, it looks something like this

how do i get the diameter calculated?

i had already thought about the area but i don't know how.

this is an edited polar plot image

Thanks a lot

Best Answer

You can get the Equivalent Circular Diameter from regionprops(). This is the diameter of the blob if you were to smoosh and mold that same shape into a perfectly circular shape. In other words, the diameter of a perfect circle with the same number of pixels as your irregularly shaped blob.

props = regionprops(mask, 'EquivDiameter');
% Extract it from the structure into a simple variable.
ecd = props.EquivDiameter % This is the "Equivalent Circular Diameter".

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MATLAB: Solving an unknown 1024×1024 variable

In MATLAB, a resolved symbolic variable is always a scalar, so you are asking solve() to find a single value that simultaneously satisfies over a million different equations.

A = sym('A', size(Vp1));
eqn = (((Vp1-V1))./(A.*exp(V1/VT)-jp)).*(A*exp(V2/VT)-jp) == Vp2-V2;
Asol = solve(eqn, A);

MATLAB: Interpolate a 1024×116 Matrix to a 1024×1024 Matrix

Assuming the curves are independent of each other, use interp1()

x = 1:116;
c1 = randn(1,116);
c2 = rand(1,116)*5;
y = linspace(-5,5,1024) .';
curves = c2 .* exp(c1.*y - (y-2).^2);
imagesc(x, y, curves)
xq = linspace(1, 116, 1024);
curves2 = interp1(x, curves.', xq) .';
imagesc(xq, y, curves2)

Best Answer

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