how to converter negative integers to postive and then get back to negative

rgb_image =(imread('baboon.tiff','tiff'));
LS = liftwave('cdf2.2','Int2Int');
[CA,CH,CV,CD] = lwt2(double(rgb_image),LS);

in CA,CH,CV,CD am getting negtive integers i want to convert negative to positive integers

then again positive to negative as original CA,CH,CV,CD and get back the baboon image

• i thought of doing one's compliment but unable to itcan any help help

Answer 1

[KSSV]

K = [-2 2 ; 2 -4] ;

% negative to positive 
idx = K<0 ;
K(idx) = -K(idx) ;

% Agin to negative 
K(idx) = -K(idx) ;

[juveria fatima]

rgb_image =(imread('baboon.tiff','tiff'));
LS = liftwave('cdf2.2','Int2Int');
[CA,CH,CV,CD] = lwt2(double(rgb_image),LS);
idx = CD<0 ;
K(idx) = -CD(idx) ;
K1(idx) = -K(idx) ;
256*256*3
KA=reshape(K1,256,256,3)

am appling your code on CD after it in KA am not gettiong the postive terms are made zero i want back CD how to do it

[KSSV]

CD(idx) = -CD(idx) ;
CD(idx) = -CD(idx) ;