Undefined function 'wprec2' for input arguments of type 'double'.

2021 8 22
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更新时间：2021 8 24
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I applied wpdec2 (Wavelet Packet transform) on a color image with size 512 * 512. It generates a subtree then I applied wpcoef to get it coefficients. On these coefficients I created blocks and apply DCT and inverse of DCT and blocks. Then i applied wprec2 after reverse process of block. Then i got a error as given below:
Undefined function 'wprec2' for input arguments of type 'double'.
Please help to troubleshoot this problem.

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dpb
dpb 2021-8-22

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Without the actual code sequence we can't tell but the doc for wprec2 says it expects a wavelet packet tree object.
If you've munged on the output of wpdec2 to produce some output array of double, then you've broken the contract between the two of the forward/reverse transform.
All wprec2 promises is that it will reproduce X from the output of wdec2 operating on X

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Balkar Singh
Balkar Singh 2021-8-24
clear all;
img = imread('Image9.png');
T = wpdec2(img,6,'db5');
Tree_cfs = read(T,'allcfs');
X = wpcoef(T);
blksize=[8,8];
blk1 = our_blkproc(X,blksize);
dct_data = zeros(8,8,size(blk1,3));
for i=1:size(blk1,3)
dct_data(:,:,i) = dct2(blk1(:,:,i));
end
dct_data_inv = zeros(8,8,size(blk1,3));
for i=1:size(blk1,3)
dct_data_inv(:,:,i) = idct2(dct_data(:,:,i));
end
final_data = our_blkproc_rev(dct_data_inv);
final_data = reshape(final_data,1,[]);
x1 = wprec2(final_data);
I tried this code

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