demo_mri.m

TwIST：两步迭代的图像分割matlab源码

function demo_MRI
% MRI demo: Reconstruction from noisy random projections
%
% This demo illustrates the twIST algorithm computing the solution  of  
%
%     xe = arg min 0.5*||A x-y||^2 + tau TV(x),
%             x
%  where x is an image, Ax is the Fourier Transform of x  computed in a 
%  "small" set of frequencies, y is a noisy observation and TV(x) is
%  the total variation of x.
% 
% The proximal operator, i.e., the solution of
%
%     xe = arg min 0.5 ||x-y||^2 + tau TV(x)
%             x
% is  given by the Chambolle algorithm
% 
% A. Chambolle, 揂n algorithm for total variation minimization and
% applications,