MATLAB: Drawing a line over a black and white image
image, image-processing, line, matlab, matlab-cvst
Solution
You may want to look at my answer to an SO question about adding a line to an image matrix. Here's a similar example to the one I have in that answer, which will make a white line running from row and column index `(10, 10)` to `(240, 120)`:
img = imread('cameraman.tif'); % Load a sample black and white image
x = [10 240]; % x coordinates
y = [10 120]; % y coordinates
nPoints = max(abs(diff(x)), abs(diff(y)))+1; % Number of points in line
rIndex = round(linspace(y(1), y(2), nPoints)); % Row indices
cIndex = round(linspace(x(1), x(2), nPoints)); % Column indices
index = sub2ind(size(img), rIndex, cIndex); % Linear indices
img(index) = 255; % Set the line points to white
imshow(img); % Display the image
And here's the resulting image:
Problem
What is the best way to draw a line over a black and white (binary) image in MATLAB, provided the start and end coordinates are known? Please note, I am not trying to add an annotation line. I would like the line to become part of the image.