Measure distance between two object with same color automatically

how do I measure distances in object which has the same colors from this image, for example the distance between "red" and "red. Thanks for your help.

[darova]

YOu should group object with the same color i think

Answer 1

[Image Analyst]

First you need to segment the image to find all the "red" regions. I have some demos for color segmentation in my File Exchange. Or you could use the Color Thresholder app on the apps tab of the tool ribbon.

Once you have a mask of the red regions, you can ask regionprops() for the centroids.

Then, with the centroids, you can use pdist2(), in the Statistics and Machine Learning Toolbox, to find the distance of every blob to every other blob.

[bimo prasetyo]

actually I have done the coding as Image Analyst has answered to the other people's questions , the red color that I range has appeared, but why has not been able to connect between blobs? so the distance is known. can you correct this coding, or provide the correct coding? thank you

[Image Analyst]

Explain what "connect" means to you. Do you want to draw a line between the two centroids?

[bimo prasetyo]

yes Image Analyst , I want to draw a line between two centroids which the line represents their distances. I hope you can correct the coding above or give the correct coding.

[Image Analyst]

Use the Color Thresholder app on the Apps tab of the tool ribbon to create a mask. Then call regionprops(mask, 'Centroid') to get the centroids. Then use plot() or line() to draw a line between each pair of centroids. Can you try this?

props = regionprops(mask, 'Centroid');
allCentroidsXY = vertcat(props.Centroid);
numBlobs = length(props);
hold on; % Don't let lines blow away image.
for k1 = 1 : (numBlobs - 1)
    x1 = allCentroidsXY(k1, 1);
    y1 = allCentroidsXY(k1, 2);
    for k2 = (k1 + 1) : numBlobs
        x2 = allCentroidsXY(k2, 1);
        y2 = allCentroidsXY(k2, 2);
        line([x1, x2], [y1, y2], 'Color', 'r', 'LineWidth', 2)
    end
end

[Hend Tayeb]

I tried it and its working! thank you