## [f1ff16]: / comp / comp_idwiltiii.m  Maximize  Restore  History

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42``` ```function [f]=comp_idwiltiii(coef,g) %COMP_IDWILTIII Compute Inverse discrete Wilson transform type III. % % This is a computational routine. Do not call it % directly. % AUTHOR : Peter L. SĂ¸ndergaard. % TESTING: OK % REFERENCE: OK M=size(coef,1); N=size(coef,2); W=size(coef,3); a=M; L=N*M; coef2=zeros(2*M,N,W,assert_classname(coef,g)); coef2(1:2:M,1:2:N,:) = exp( i*pi/4)*coef(1:2:M,1:2:N,:); coef2(2*M:-2:M+1,1:2:N,:) = exp(-i*pi/4)*coef(1:2:M,1:2:N,:); coef2(1:2:M,2:2:N,:) = exp(-i*pi/4)*coef(1:2:M,2:2:N,:); coef2(2*M:-2:M+1,2:2:N,:) = exp( i*pi/4)*coef(1:2:M,2:2:N,:); coef2(2:2:M,1:2:N,:) = exp(-i*pi/4)*coef(2:2:M,1:2:N,:); coef2(2*M-1:-2:M+1,1:2:N,:) = exp( i*pi/4)*coef(2:2:M,1:2:N,:); coef2(2:2:M,2:2:N,:) = exp( i*pi/4)*coef(2:2:M,2:2:N,:); coef2(2*M-1:-2:M+1,2:2:N,:) = exp(-i*pi/4)*coef(2:2:M,2:2:N,:); % Apply the generalized DGT and scale. %f=comp_igdgt(coef2,g,a,2*M,L,0,.5,0,0)/sqrt(2); f = comp_isepdgt(coef2,g,L,a,2*M); halfmod=exp(pi*i*(0:L-1).'/(2*M))/sqrt(2); f=f.*repmat(halfmod,1,W); if isreal(coef) && isreal(g) f=real(f); end; ```