about image pixel rotate

Hi everyone,

I use 'imrotate' function to rotate a image, the rotate degree is theta, however, how can I get the location of fix points,let's say (x,y), after image rotated.

Thanks

Answer 1

[Matt J]

Apply a rotation matrix,

R=@(theta) [cosd(t), -sind(t); sind(t), cosd(t)];

c=size(image)/2+1/2;

newpoint = R(theta)*([x,y]-c).'