how to draw a diagonal in the given image from the top left corner to the bottom right corner?
9 views (last 30 days)
Show older comments
Naishil shah
on 8 Jan 2014
Commented: Image Analyst
on 8 Jan 2014
i want to draw a diagonal in the given image from the top left corner to the bottom right corner
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/154824/image.jpeg)
0 Comments
Accepted Answer
Image Analyst
on 8 Jan 2014
[rows, columns, numberOfColorChannels] = size(rectangleImage);
x = [1, columns];
y = [1, rows];
line(x,y, 'LineWidth', 4, 'Color', [1, 0, 1]);
Adapt as needed.
2 Comments
Image Analyst
on 8 Jan 2014
Use poly2mask() to create a binary mask from the 3 triangle vertices. Then blacken the image. I think you may have to do it a color channel at a time
binaryImage = poly2mask(x, y, rows, columns);
% Extract individual color channels.
redChannel = double(rgbImage(:, :, 1));
greenChannel = double(rgbImage(:, :, 2));
blueChannel = double(rgbImage(:, :, 3));
% Now blacken
redChannel(binaryImage) = 0;
greenChannel(binaryImage) = 0;
blueChannel(binaryImage) = 0;
rgbOut = cat(3, redChannel, greenChannel, blueChannel);
imshow(rgbOut);
More Answers (0)
See Also
Categories
Find more on Modify Image Colors in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!