change color "bwperim"

Hello... I got this code form Help MATLAB, in "Detecting a Cell Using Image Segmentation"

BWoutline = bwperim(BWfinal);
Segout = I;
Segout(BWoutline) = 255;

The edge color of that picture is white.. Is possible change the color to another color..?? Thank you.. ^^

Answer 1

[Walter Roberson]

You are working with gray-scale images at present. In order to change the edge color you would have to convert the gray-scale to color.

For example,

SegoutR = I;
SegoutG = I;
SegoutB = I;
%now set yellow, [255 255 0]
SegoutR(BWoutline) = 255;
SegoutG(BWoutline) = 255;
SegoutB(BWoutline) = 0;
SegoutRGB = cat(3, SegoutR, SegoutG, SegoutB);

[Rahma Yeni]

Great.. Thank you Mr. Walter..

and, how to change the line width..?? because, when i tried it to my case, it's so thin..

thank you.. ^^

[Image Analyst]

Run imdilate on BWoutline.

thickOutlines = imdilate(BWoutline, true(3));

[Rahma Yeni]

Thank you Image Analyst.. ^^

[Markus Kokot]

for me it does not work - which picuture name would than be in the end to show in this example ?

and is "I" the imread picture from your beginning which is not in greyscale?

Answer 2

[Spandan Tiwari]

You can change the color by filling the perimeter pixels with a color value instead of a scalar 255. One possible way to do this is as follows:

% First make a RGB image for display:

Segout = repmat(I, [1 1 3]);

% Find indices of the boundary pixels

outline_idx = find(BWoutline);

% Find the indices to fill in the RGB image

Segout_idx = [outline_idx; numel(BWoutline)+outline_idx; ...  2*numel(BWoutline)+outline_idx]; 

% Select the color (RGB triplet) for the boundary. I choose red. 

colorValue = [255; 0; 0]; % For green [0 255 0]

% Prepare a color vector to fill in the RGB image

outline_fill_values = kron(colorValue,ones(size(outline_idx)));

% Fill the RGB image with the color value

Segout(Segout_idx) = outline_fill_values;

% Display the RGB image 

figure, imshow(Segout), title('outlined original image');