Matlab图像几何变换之图像旋转

                                                           Matlab图像旋转
####以坐标原点为中心旋转的原理：
点$p_0$绕坐标原点逆时针方向旋转$\theta$角度得到点$p_1$.

从①②可以得到旋转变换的矩阵公式：
$\left[\begin{array}{ccc}{x}_1& y_1& 1\end{array}\right]$=$\left[\begin{array}{ccc}{x}_0& y_0& 1\end{array}\right]$$\left[\begin{array}{ccc}cos(\theta )& sin(\theta )& 0\\ -sin(\theta )& cos(\theta )& 0\\ 0& 0& 1\end{array}\right]$

还可以得到逆运算矩阵公式：
$\left[\begin{array}{ccc}{x}_0& y_0& 1\end{array}\right]$=$\left[\begin{array}{ccc}{x}_1& y_1& 1\end{array}\right]$$[\begin{array}{ccc}cos(\theta )& -sin(\theta )& \\ sin(\theta )& cos(\theta )& \\ 0& 0& \end{array}$