Three-level Daubechies wavelet transform?

21 次查看（过去 30 天）

sana 2013-12-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/110904-three-level-daubechies-wavelet-transform

评论： Wayne King 2013-12-28

i would like to perform Three-level Daubechies wavelet transform on an input image. i try to for the answer but i dint get the answer. can any one tell me how to get this kind of image

this is an exapmle given in an matlab help

load woman;
% X contains the loaded image. 
% map contains the loaded colormap. 
nbcol = size(map,1);
% Perform single-level decomposition 
% of X using db1. 
[cA1,cH1,cV1,cD1] = dwt2(X,'db1');
% Images coding. 
cod_X = wcodemat(X,nbcol); 
cod_cA1 = wcodemat(cA1,nbcol); 
cod_cH1 = wcodemat(cH1,nbcol); 
cod_cV1 = wcodemat(cV1,nbcol); 
cod_cD1 = wcodemat(cD1,nbcol); 
dec2d = [ cod_cA1,     cod_cH1;  
        cod_cV1,     cod_cD1];
imshow(dec2d,[])

1) how he get Map i.e [i.e which color map like hsv or gray or bones....],

2) how to perform for 2 or 3 or 4 level decomposition. { i know i just need to change from db1 to db2 or ...... but when i am displaying my result its just a weight colored image }...

Please help me.............