how to mark the outline alone of the given input image?

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Sivakumaran Chandrasekaran 2012-8-21

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how to mark the outline alone of the given input image? I need to show the border of the medical image..

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Sivakumaran Chandrasekaran 2012-8-21

You can see the output in the link http://tinypic.com/view.php?pic=dp9w29&s=6

Image Analyst 2012-8-21

That is not the border of the image. That is the perimeter of an object in the image, such as the liver. You need to segment out that region.

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Jürgen 2012-8-21

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Hi,

I think 'Image Analyst' gave a useful answer in http://www.mathworks.nl/matlabcentral/answers/46407-image-edge-to-black

there the image outline is put to black

regards, Jürgen

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Sivakumaran Chandrasekaran 2012-8-21

Thanks Jurgen... Can you tell me the site where i can upload my image

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Image Analyst 2012-8-21

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在 MATLAB Online 中打开

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
redChannel(1,:) = 0;
redChannel(end,:) = 0;
redChannel(:,1) = 0;
redChannel(:,end) = 0;
greenChannel(1,:) = 255;
greenChannel(end,:) = 255;
greenChannel(:,1) = 255;
greenChannel(:,end) = 255;
blueChannel(1,:) = 0;
blueChannel(end,:) = 0;
blueChannel(:,1) = 0;
blueChannel(:,end) = 0;
rgbImage = cat(3, redChannel, greenChannel , blueChannel);