How to draw a line on an image in matlab?

by

The simplest way to draw a line onto an image is to use PLOT.

%# read and display image
img = imread('autumn.tif');
figure,imshow(img)

%# make sure the image doesn't disappear if we plot something else
hold on

%# define points (in matrix coordinates)
p1 = [10,100];
p2 = [100,20];

%# plot the points.
%# Note that depending on the definition of the points,
%# you may have to swap x and y
plot([p1(2),p2(2)],[p1(1),p2(1)],'Color','r','LineWidth',2)

If you want a different color, either change the letter to any of rgbcmykw, or use RGB triplets (red is [1 0 0]). Have a look at the lineseries properties for more formatting options.

More Related Contents:

  1. Matlab: How to bend line in image
  2. How to interpolate with MATLAB 3D usind scatteredinterpolant plot? [closed]
  3. Matlab how to save a modified image from axes [closed]
  4. Matlab: Running an m-file from command-line
  5. Loop through files in a folder in matlab
  6. Hash tables in MATLAB
  7. Find given row in a matrix
  8. Use a vector as an index to a matrix
  9. How to concatenate a number to a variable name in MATLAB?
  10. Suppressing a function’s command window output
  11. How to normalize / denormalize a vector to range [-1;1]
  12. How do I get the second return value from a function without using temporary variables?
  13. Matlab Template Matching Using FFT
  14. Sorting entire matrix according to one column in matlab
  15. How to generate a non-linear colormap/colorbar?
  16. how to count unique elements of a cell in matlab?
  17. How can I save an altered image in MATLAB?
  18. What are the semantics of ‘end’ in Matlab?
  19. Setting graph figure size
  20. How do I detect if I’m running MATLAB or Octave?
  21. What is a spectrogram and how do I set its parameters?
  22. String to variable name MATLAB
  23. How do I get the handles of all open figures in MATLAB
  24. How to show legend for only a specific subset of curves in the plotting?
  25. Real time plot in MATLAB
  26. Matlab imshow omit NaN
  27. General method to find submatrix in matlab matrix
  28. Fitting largest circle in free area in image with distributed particle
  29. How to perform interpolation on a 2D array in MATLAB
  30. Automatically maximize a figure

Leave a Comment