INVPPFTCG

the inverse of PPFT USING CG (conjugate gradient) method.

Contents

Description

X = INVPPFTCG(Y,K,ERR) return the inverse PPFT using CG in at most K
iteration or at precision control by ERR. K

[X,ITERS,RSNEW,TSEC]=IINVPPFTCG(Y,K,C,ERR,WEIGHTED);
INPUT: y - input image on ppGrid
       K - maximal iteration times
       C - weights on ppGrid
       err - iteration stop error
       weighted - if equal to 1, solve P^\star w P X = Y, else solve
       P^\star w P = C.*Y;
OUPUT: x    - image;
      iters - iteration times;
      rsnew - residual error;
      tsec  - total running times in seconds;

Examples

        img = imread('barbara.gif');
        img = double(img(1:64,1:64));
       pImg = ppFT(img,2);
       oImg = InvppFTCG(pImg);
       err  = norm(oImg-img,'fro')/norm(img,'fro')

err =

  2.9547e-007

See also

PPFT, ADJPPFT, FTCF, INVFTCF,

Copyright

Copyright (C) 2011. Xiaosheng Zhuang, University of Osnabrueck

Published with MATLAB® 7.10