Rotate image parallel to the x-axis

Hello

If I select two points in the picture, and then I extracted the angle between this two points, (note between them line to clarify) Like this picture:

Can I rotate the image so that the path between these two points is parallel to the x-axis, as in the following picture?

I mean if I have two points in a gray or binary image, I want to rotate this image so that the path between the two points is parallel to the X axis.

thank you

[dpb]

If have Image Processing TB, check out

doc imrotate

[wisam kh]

I used this code to find the angle between the two points

 ang = atan2 (y2-y1, x2-x1);

then applied this process

 B = imrotate (img, ang);

But I did not get the result I wanted.

I want the path between the two points to be identical to the x-axis after the image is rotated

[KALYAN ACHARJYA]

Attach the original image.

[jonas]

When you use the word identical, do you mean parallel to the x-axis?

[Jan]

@wisam kh: "But I did not get the result I wanted." What do you get instead?

[dpb]

ang = atan2 (y2-y1, x2-x1);

which point is 1, which is 2 in the image? You have to be sure to ask to rotate in the proper direction to counteract the computed angle, not compound it.

[wisam kh]

Sorry if my question is unclear.

I mean if I have two points in a gray or binary image, I want to rotate this image so that the path between the two points is parallel to the X axis.

[dpb]

It's not the Q? that's unclear, I was pointing out you must define which direction the angle is defined from and ensure you do the rotation to negate the angle as opposed to adding to it...

As others said, your description of what is not as expected is not useful

Answer 1

[Amir Xz]

A = [50  70]; %[x y] & x,y: pixel number
B = [100 30]; %[x y]

% find point2 (point with larger x)
if A(1)>B(1)
  P2 = A; P1 = B;
else
  P2 = B; P1 = A;
end

% clockwise OR counterclockwise
if P2(2)<P1(2)
  w=-1; % clockwise
else
  w=+1; % counterclockwise
end

angle = w*atan(abs(P2(2)-P1(2))/(P2(1)-P1(1)))*180/pi; % deg
ImgRot = imrotate(Img,angle);

[wisam kh]

Thank you very much

The code works fine.