matlab程序语言，图像增强算法的代码-　Function [U, minv, SS] = Nonlinear_Diffusion (U_0, tau, eps, p, T, theta, sigma, fig_handle)

　Performs nonlinear scalar valued and coupled vector/matrix valued diffusion

　Inputs:

　U_0 nxmx dxw input field:

　D = 1, w = 1: scalar valued diffusion (eg grayscale image)

　D> 1, w = 1: coupled vector valued diffusion (eg color image)

　D> 1, w> 1: coupled isotropic matrix valued diffusion (eg nonlinear structure tensor)

　Of tau 1 x 1 (optional) time the step size

　Eps, 1 x 1 (optional) epsilon for the diffusivity function

　P 1 x 1 (optional) p of the diffusivity function:

　P = 0 corresponds to homogeneous diffusion gaussian the smoothing

0 <p <1 corresponds to the forward diffusion