How to run this code?

Hi, i have problem on running this code due to some error. The only output is the displaying of ‘original image’. Hopefully, you guys can help me fix it. Thank you so much.

error: Error in Wprocess (line 18) H1=rgb2gray(I2); %convert it into gray scale image

x=.01;

t=cputime;
I1=imread('lena.jpg');%read image
% I1=imread('mand.jpg');%read image
H=rgb2gray(I1); %convert it into gray scale image
J=imresize(H,[512 512]);%resize image into 512x512 image
J= double(J);
[M,N]=size(J);
figure,imshow(uint8 (J));title('Original image')
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('haar');
[ca,ch,cv,cd] = dwt2(J,Lo_D,Hi_D);
[ca1,ch1,cv1,cd1] = dwt2(ch,Lo_D,Hi_D);
[U,S,V] = svd(ch1);
[m,n]=size(S);
% Copy the original Singular value
Sw=S;
I2=imread('cameraman.jpg');%read Watermark image
H1=rgb2gray(I2); %convert it into gray scale image
J1=imresize(H1,[128 128]);%resize image
[a,b]=size(ch1);
W1= double(J1);
W1=imresize(W1,[a b]);% resize the 1 watermark image
[p,q]=size(W1);
%  Watermark insertion
S=S+(x*W1);
[U_w,S_w,V_w]=svd(S);
[cs1]=[U*S_w*V'];
wing = idwt2(ca1,cs1,cv1,cd1,Lo_R,Hi_R);
wing1 = idwt2(ca,wing,cv,cd,Lo_R,Hi_R);
t1=cputime;
figure,imshow(uint8(wing1)),title('Watermarked Image')

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Your cameraman.jpg image is already a gray image, you are trying to convert it to gray using rgb2gray, that’s why error.

Try this:

x=.01;
t=cputime;
I1=imread('lena.jpg');%read image
% I1=imread('mand.jpg');%read image
H=rgb2gray(I1); %convert it into gray scale image
J=imresize(H,[512 512]);%resize image into 512x512 image
J= double(J);
[M,N]=size(J);
figure,imshow(uint8 (J));title('Original image')
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('haar');
[ca,ch,cv,cd] = dwt2(J,Lo_D,Hi_D);
[ca1,ch1,cv1,cd1] = dwt2(ch,Lo_D,Hi_D);
[U,S,V] = svd(ch1);
[m,n]=size(S);
% Copy the original Singular value
Sw=S;
I2=imread('cameraman.jpg');%

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How to run this code?

How to run this code?