rotation matrice

Hi , I have a colormap image of a blood vessel which is tilted by 10 degrees, I want to rotate it and make it horizontal.

I tried to do it by 'imrotate', but it didn't work. I am wondering if there is another way to do that. How can I for example define the rotation matrice to multiply by my image matrice? (The image matrice is not square, it is 1559*119 )

Answer 1

[Grzegorz Knor]

What does it mean "it didn't work"? Have you got an errors?

Look at example:

I = imread('coins.png');
figure, imshow(I)
J = imrotate(I,-10,'bilinear','crop');
figure, imshow(J)
K = imrotate(J,10,'bilinear','crop');
figure, imshow(K)