How to find the center co-ordinates of different regions

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Tania 2015-5-11

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评论： Tania 2015-5-11

Hi there,

Can anyone assist me how to find the center co-ordinates automatically and save the co-ordinate (x and y position) values in an array automatically? The shapes are different for the regions but each region has same pixel value.

Please have a look at my image and guide me how to find the center co-ordinates of each region and save them in an array automatically without using manual operation.

Any help will be highly appreciated.

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采纳的回答

Image Analyst 2015-5-11

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编辑：Image Analyst 2015-5-11

在 MATLAB Online 中打开

I thought you'd seen it before, but I guess not. See my image segmentation tutorial in my File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Basically it's something like

grayImage = rgb2gray(rgbImage);
[labeledImage, numberOfBlobs] = bwlabel(grayImage ~= 0);
measurements = regionprops(labeledImage, 'Centroid');
allCentroids = [measurements.Centroid];
xCentroids = allCentroids(1:2:end);
yCentroids = allCentroids(2:2:end);

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Image Analyst 2015-5-11

在 MATLAB Online 中打开

If you want to treat the black background as its own object, then you'll have to do that separately (well, that's the simplest and most straightforward way).

grayImage = rgb2gray(rgbImage);
[labeledImage, numberOfBlobs] = bwlabel(grayImage == 0);
measurements = regionprops(labeledImage, 'Centroid');
allCentroids = [measurements.Centroid];
xCentroids = allCentroids(1:2:end);
yCentroids = allCentroids(2:2:end);

Note the == 0 instead of ~= 0 so that we pick up only pure black pixels.

Tania 2015-5-11