How to draw a line on an image in matlab?

Question

I have two points lets say:

• P(x,y) [point lies at the top of image]
• P'(x',y') [point lies at bottom of image]

Now i want to draw a line betwen these two points....and the line should appear on image means should be visible.

how to do this????

Answer 1

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.