hello every one, i'am a newbie, i have a error ? how can i fix it ???

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Join Snow 2020-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/544127-hello-every-one-i-am-a-newbie-i-have-a-error-how-can-i-fix-it

关闭： MATLAB Answer Bot 2021-8-20

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Join Snow 2020-6-8

在 MATLAB Online 中打开

clc
clear all
close all
warning off
%% audio input
ok_classical=0;   % 1 selected 0 not-selected 1 t?c là ch?n , 0 là không ch?n
ok_jazz=0;
ok_pop=0;
ok_looney=1;
 if ok_classical
[y,Fs] = audioread('classical.wav');
 end
 if ok_jazz
[y,Fs] = audioread('jazz.wav');
 end
 if ok_pop
[y,Fs] = audioread('pop.wav');
 end
 if ok_looney
[y,Fs] = audioread('Song-Gio-Huong-Ly.wav');
 end
x1=y(1:262144);
x1=reshape(x1,1,262144);
figure
plot(x1)
title('Host Audio')
xlabel(' Thoi gian (Mau)');
ylabel('Bien do');
x=reshape(x1,512,512);
Key=7;
[L1, L2]=size(x);
%% image input chuy?n ?nh màu v? ?nh xám
img  = imread('unnamed.jpg'); %Get the input image, ?nh c?n ??a vào
I = rgb2gray(img);
po=im2bw(I);
w1=im2bw(I);%Convert to grayscale image chuy?n v? ?nh thang ?? xám
figure
imshow(w1)
%% cyclic code encoding// mã hóa theo chu kì
w1=reshape(w1,128,2);
n = 3; k = 2; % A (3,2) cyclic code
code1 = encode(double(w1),n,k,'cyclic/binary');   % 2 level of encoding
code2 = encode(code1(:,1:2),n,k,'cyclic/binary');
code3 = encode(code1(:,2:3),n,k,'cyclic/binary');
part1=reshape(code2(:,1:2),128,2);
part2=reshape(code2(:,2:3),128,2);
part3=reshape(code3(:,1:2),128,2);
part4=reshape(code3(:,2:3),128,2);
a1=horzcat(part1,part2);
b1=horzcat(part3,part4);
z=vertcat(a1,b1);
w1=reshape(z,32,32);
%% Arnold Scrambling with Key
w1=arnold(w1,Key);
%% 3 level of DWT decomposition with HAAR wavelet
[L,H,V,D]=dwt2(x,'haar','sym');
[CL,CH,CV,CD]=dwt2(H,'haar','sym');
[CA1,CA2,CA3,CA4]=dwt2(CH,'haar','sym');
for i=1:16
    a(i)=4;
end
for i=1:16
    b(i)=4;
end
%% DCT of sub-band block CH->CA2
newCA2=mat2cell(CA2,a,b);
d=zeros(64,64);
nCA2=mat2cell(d,a,b);
for i=1:16
    for j=1:16
        nCA2{i,j}=dct2(newCA2{i,j});
    end
end

Walter Roberson 2020-6-8

For the original CW16.jpg, then reshape(w1,128,2) works for me as w1 does have exactly 256 elements, as the img is 16 x 16.

However, unknown.jpg is 562 by 1679 and so has no chance of being reshaped to 128 x 2. If you were to try to resize it to 16 x 16 first, it would be unreadable.

Join Snow 2020-6-8