how to draw a diagonal in the given image from the top left corner to the bottom right corner?
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Naishil shah
le 8 Jan 2014
Commenté : Image Analyst
le 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 commentaires
Réponse acceptée
Image Analyst
le 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 commentaires
Image Analyst
le 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);
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Modify Image Colors dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!