how to change the color of one pixel in a binary image ?
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i want to change the color of one pixel of a binary image.for example change a white pixel to red.would you pleaz help me?
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Risposte (2)
Image Analyst
il 27 Dic 2015
You can convert it to a color image and then set the pixel to red, like harjeet did. Of course I hope you know that the RGB image is no longer a binary image, so don't use that in any further processing, like pass it to regionprops() or bwconncomp() or something.
An alternative is to just plot a red dot over the pixel.
imshow(binaryImage); % Display it.
% Plot a red dot at row 30, column 173
hold on;
plot(173, 30, 'r.', 'MarkerSize', 10);
Make the marker size whatever you want. This does not create a new color image and does not change the binary image, it just plots a red dot in the overlay above the image. The two solutions so far will both make a red pixel on the displayed image at the designated position, but they do it in different ways. Pick whichever solution does it in the way you want most.
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harjeet singh
il 27 Dic 2015
hello fariba you may use this code
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/172402/image.png)
clear all
close all
clc
a=100;
img(1:a,1:a)=0;
img=logical(img);
pixel_val=[50 50;50 10;20 30];
for i=1:size(pixel_val)
rgb_img(pixel_val(i,1),pixel_val(i,2),:)=[255 0 0];
end
figure(1)
imshow(rgb_img);
drawnow
2 Commenti
Anuruddha Jayasuriya
il 19 Lug 2018
Hi, harjeet singh. In your code, can you tell what is the purpose of defining a=100. Also what does img=logical(img) do in this code.
Thanks!
Dzung Nguyen
il 20 Mar 2019
Modificato: Dzung Nguyen
il 20 Mar 2019
a = 100 is just there to set the dimension of img later in the next line.
img=logical(img) --> see https://www.mathworks.com/help/matlab/ref/logical.html
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