Read and display an image.

I = imread('pout.tif'); imshow(I)

Create anaffine2dobject that defines a 30 degree clockwise rotation around the origin. View the transformation matrix stored in theTproperty.

theta = 30; tform = affine2d([cosd(theta) sind(theta) 0; -sind(theta) cosd(theta) 0; 0 0 1]); tform.T

ans =3×30.8660 0.5000 0 -0.5000 0.8660 0 0 0 1.0000

Apply the forward geometric transformation,tform, to the image. Display the rotated image.

J = imwarp(I,tform); imshow(J)

在vert the geometric transformation. The result is a newaffine2dobject that represents a 30 degree rotation in the counterclockwise direction.

invtform = invert(tform); invtform.T

ans =3×30.8660 -0.5000 0 0.5000 0.8660 0 0 0 1.0000

Apply the inverse geometric transformation,invtform, to the rotated imageJ. The final image,K, has the same size, shape, and orientation as the original image. Black padding around the image results from the two transformations.

K = imwarp(J,invtform); imshow(K)