how to change the color of one pixel in a binary image ?

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fariba amini
fariba amini 2015 年 12 月 27 日
編集済み: Dzung Nguyen 2019 年 3 月 20 日
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?

回答 (2 件)

Image Analyst
Image Analyst 2015 年 12 月 27 日
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.

harjeet singh
harjeet singh 2015 年 12 月 27 日
hello fariba you may use this code
clear all
close all
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];
  2 件のコメント
Dzung Nguyen
Dzung Nguyen 2019 年 3 月 20 日
編集済み: Dzung Nguyen 2019 年 3 月 20 日
a = 100 is just there to set the dimension of img later in the next line.



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