MATLAB: Number of pixels inside circles of different radius on a single picture

faqpixels inside circles

i wanted to draw circles with different radius on a picture and count number of pixels inside each circle coverage..

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Code samples are in the FAQ. http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

A similar demo of mine is attached.

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MATLAB: How to make points on the contour of the picture

Lower your threshold and then call bwperim() or bwboundaries().

MATLAB: How to convert this circle drawing code as a Function code? thank you

Maitham, check out the following:

function my_circ(imageSize, center, radius)  % function definition
% Create a logical image of a circle with specified 
% diameter, center, and image size. 
% First create the image.
imageSizeX = imageSize(1);
imageSizeY = imageSize(2);
[columnsInImage rowsInImage] = meshgrid(1:imageSizeX, 1:imageSizeY);
% Next create the circle in the image.
centerX = center(1);
centerY = center(2);
circlePixels = (rowsInImage - centerY).^2 ...
    + (columnsInImage - centerX).^2 <= radius.^2;
% circlePixels is a 2D "logical" array.
% Now, display it.
image(circlePixels) ;
colormap([0 0 0; 1 1 1]);
title('Binary image of a circle');
end   % end of function

which is called (e.g., from the MATLAB command window) with

my_circ([400 600], [20 30], 50)

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Related Solutions

MATLAB: How to make points on the contour of the picture

MATLAB: How to convert this circle drawing code as a Function code? thank you

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