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

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

[Image Analyst]

What does this mean? Can you upload an example of an unmarked and marked image? As far as I know, the border of all images are showing, unless they're zoomed.

[Sivakumaran Chandrasekaran]

Thanks Image Analyst!! Can you mail me the site or page, where i can upload the image

[Sivakumaran Chandrasekaran]

hi Image Analyst !!! The border of the image has to be marked separately using Green color

[Image Analyst]

Try tinypic.com

[Sivakumaran Chandrasekaran]

Thanks Image Analyst.. you can find the input image in the link http://tinypic.com/r/2mhscwx/6.....

[Sivakumaran Chandrasekaran]

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

[Image Analyst]

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.

Answer 1

[Jürgen]

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

[Sivakumaran Chandrasekaran]

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

Answer 2

[Image Analyst]

% 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);