How to find the coordinates of to points in a image?

I have two points in a image. I want to fix coordinates of the two points and convert them into polar coordinates. My intention is to find the angle made by the vector joining these two points.

[Azzi Abdelmalek]

What do you mean by : to fix coordinates of the two points

Answer 1

[Image Analyst]

angle = atan2d((y2-y1)/(x2-x1));

[Abin Krishnan]

How to find the coordinates of the point on the image.

[Walter Roberson]

How do you tell where the points are? Is there something distinctive about the points that you search for in the image? Or are you wanting the user to click on the points? If that is the case look at ginput()

[Image Analyst]

You said "I have two points in a image" so I assume that you already specified them in some way that you did not tell us about.