MATLAB: How to store a circle perimeter pixels in an array that is drawn over an binary image object

digital image processingimage processing

I have drawn two circles over an binary image object by taking radius=half of the mean major and minor axis and another one is 0.7*radius. Also have drawn its minor axis. Now I want to consider the upper portion of the minor axis and want to store perimeter pixels of those semi circles in individuals array. How to do that ?

Best Answer

Take your arrays that you drew, x and y, and extract only those above the center y value

indexes = y < centerY;  % Only those in the upper half.
xTop = x(indexes);
yTop = y(indexes);

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If you just want the equivalent circular diameter, you can ask regionprops().

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ECD = props.EquivDiameter; % Equivalent Circular Diameter - diameter of a circle with the same number of pixels as your blob.

If you want radius as a function of angle, then that's more complicated and involves using regionprops to find the centroid, bwboundaries() to find the outline, atan2d() to find the angle, and sqrt() to find the distance (radius) at that angle.

MATLAB: How can plot multiple same amplitude signals along with same y axis

Try something like this using the bsxfun (link) function:

x = linspace(0, 2*pi);                              % Independent Variable
y = sin((0:5)'*x);                                  % Original Signals
y = bsxfun(@plus, y, (0:size(y,1)-1)'*2);           % Separated Signals
figure
plot(x, y)
grid

EDIT —

Added plot:

How can plot multiple same amplitude signals along with same y axis - 2019 01 22.png

Best Answer

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MATLAB: Finding average radius of a binarized image of a circle

MATLAB: How can plot multiple same amplitude signals along with same y axis

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