MATLAB: Greetings. I want to ask on how to calculate radius of circle in matlab

image processingImage Processing Toolboximage segmentation

This is the example of image

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Maybe one of these links will give you some ideas about how to get started:

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MATLAB: Greetings, how to calculate area and parameter of cell.

See my Image Segmentation Tutorial: https://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc

In short

binaryImage = yourImage < 128;
props = regionprops(binaryImage, 'Area', 'Perimeter');
allAreas = [props.Area]
allPerimeters = [props.Perimeter];

You can add other parameters is you wish.

MATLAB: How to select only round objects from this image

Threshold the image to get the blobs, then compute circularities and filter to get those with circularities near 1:

mask = imbinarize(grayImage);
mask = imfill(mask, 'holes');
labeledImage = bwlabel(mask);
props = regionprops(mask, 'Area', 'Perimeter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
circularities = allPerimeters .^ 2 ./ (4 * pi * allAreas);
% Get those blobs with circularity near 1.
roundindexes = find(circularities > 0.8 & circularities < 1.5)
% Get new mask
roundBlobs = ismember(labeledImage, roundIndexes);
imshow(roundBlobs);
title('Only the round blobs')

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MATLAB: Greetings, how to calculate area and parameter of cell.

MATLAB: How to select only round objects from this image

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