change color "bwperim"

Question

Rahma Yeni 2012-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/35602-change-color-bwperim

评论： Markus Kokot 2020-12-29

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.. ^^

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Answer 1

Walter Roberson 2012-4-16

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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);

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Rahma Yeni 2012-4-17

Thank you Image Analyst.. ^^

Markus Kokot 2020-12-29

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?

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Answer 2

Spandan Tiwari 2012-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/35602-change-color-bwperim#answer_44582

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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');