MATLAB: Finding number of pixels inside each circle

circlepixel counting

i am drawing circles of different radius on a jpg image. how to find the number of pixels in each circle. i have to compare the pixel distribution ratio in each circle

Best Answer

I'm pretty sure I gave you the answer in your other question: http://www.mathworks.com/matlabcentral/answers/169093#comment_261946 How is this any different than that?

Related Solutions

MATLAB: Is it possible to fill the kink at 4 o’clock in this image

I'd call imfill, then bwareafilt(mask, 1) to get the largest blob.

mask = imfill(mask, 'holes');
mask = bwareafilt(mask, 1);

Then call bwboundaries and use the FAQ to fit it to a circle.

boundaries = bwboundaries(mask);
boundaries = boundaries{1};
x = boundaries(:, 2);
y = boundaries(:, 1);

https://matlab.fandom.com/wiki/FAQ#How_can_I_fit_a_circle_to_a_set_of_XY_data.3F

Then use poly2mask to make a mask of the perfect/fit circle and AND the two

[rows, columns] = size(mask);
circleMask = poly2mask(xCircle, yCircle, rows, columns);
outputMask = mask & circleMask;

MATLAB: Suggest a program for finding the intersection point of two lines in a skeletonized image.The coordinates of the intersection points has to be returned.

Try this:

crossings = bwmorph(binaryImage, 'branchpoints');

Best Answer

Related Solutions

MATLAB: Is it possible to fill the kink at 4 o’clock in this image

MATLAB: Suggest a program for finding the intersection point of two lines in a skeletonized image.The coordinates of the intersection points has to be returned.

Related Question