Hi, i am trying to run this code and facing problem. So plz help.....!!!

clc;
close all;
clear all;

% save start time
start_time=cputime;

k=2;            % set the gain factor for embeding

%read the original video and get the information                                                      
vid = VideoReader('vipmen.avi');
mov = read(vid);

% size of the each frame
Mc=mov.Height;
Nc=mov.Width;

% read in the message image and reshape it into a vector
file_name='_copyright_small.bmp';
message=double(imread(file_name));   % 0's and 255's in matrix 
[Mm,Nm]=size(message);
message_vector=round(reshape(message,Mm*Nm,1)./256);

% read in key for PN generator
file_name='_key.bmp';
key=double(imread(file_name))./256;
% key=mean(key);

for h=1:mov.NumFrames
    for z=1:3
        % take the single frame of the video
        cover_object=mov(h).cdata(:,:,z);
        cover_object=double(cover_object);

% reset MATLAB's PN generator to state "key"
rand('state',key(1));

%perform DWT
[cA1,cH1,cV1,cD1] = dwt2(cover_object,'haar');

% add pn sequences to H1 and V1 componants when message = 0 
for (kk=1:length(message_vector))
    pn_sequence_h=round(2*(rand(Mc/2,Nc/2)-0.5));
    pn_sequence_v=round(2*(rand(Mc/2,Nc/2)-0.5));

      if (message(kk) == 0)
          cH1=cH1+k*pn_sequence_h;
          cV1=cV1+k*pn_sequence_v;
      end
  end

% perform IDWT
watermarked_image = idwt2(cA1,cH1,cV1,cD1,'haar',[Mc,Nc]); 

R{z}=watermarked_image;

      end
      % I2--> 3D color watermarked frame 
      I2=cat(3,cell2mat(R(1)),cell2mat(R(2)),cell2mat(R(3)));
       % I3--> all watermarked frames in 4-D
      I3(:,:,:,h)=I2;
  end

%convert all the frames into matlab movie format
for y=1:h
    mov2(y).cdata=uint8(I3(:,:,:,y));                                         
    mov2(y).colormap=[];
end

% matlab movie is converted into avi file and it is stored into hard disk
movie2avi(mov2,'watermarkedvideo','FPS',30,'compression','None')                                   

% display processing time
elapsed_time=cputime-start_time

[Naman]

It shows error: Attempt to reference field of non-structure array.

[Walter Roberson]

Which line does it show that for?

Note: your

Mc=mov.Height;
Nc=mov.Width;

should be

Mc = mov(1).Height;
Nc = mov(1).Width;

[Naman]

Thanks both of you for your reply.

[Naman]

Error has been fixed. Now i want to use it with MATLAB function block and i do not knw how to use it with this code.

Answer 1

[Mehdi]

Can you attach vipmen.avi so the code can be run to check errors

[Naman]

vipmen.avi is a small video. You can consider any video instead of this and rename it as vipmen.avi (.avi is a kind of video format)