i'm working with image ,i cant load 512*512 image

Question

Farjana Yeasmin 2014-11-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163943-i-m-working-with-image-i-cant-load-512-512-image

评论： Farjana Yeasmin 2014-11-24

采纳的回答： Geoff Hayes

在 MATLAB Online 中打开

all time i face a error

Attempted to access N(1,1,3); index out of bounds because size(N)=[256,256,1].my code is here:

function [mg_length,mes] = embed_file(image_file1,text_file1)
clc
M=imread(image_file1); [X,Y,V] = size(M);
disp(sprintf('%d %d %d',X,Y,V));
%N=rgb2gray(M);
N=M;
T=N;
str={};
z='';
count=0;
fid = fopen(text_file1);
tline = fgetl(fid);
while ischar(tline)
      if(length(tline)==0)
          z=[z,char(dec2bin(13,8))];
          z=[z,char(dec2bin(10,8))];
      else
          str=[str,tline];
          t= dbinary(str);
          if(count~=0)
              z=[z,char(dec2bin(13,8))];
              z=[z,char(dec2bin(10,8))];
          end
          z=[z,t];
      end
     count=count+1;
     tline = fgetl(fid);
     str='';
  end
mes='';
disp(z); %disp(N);
imageSize=X*Y;
key=length(z);
mg_length=key;
disp('message length');
disp(key);
if(imageSize>key)
mes='embed successful';
d=1;
for i=1:X
      for j=1:Y
          a=N(i,j,3);
          b=z(1,d);
         [T(i,j,3),p]=changeImage2(a,b,key);
         %a=N(i,j,2);
         %[T(i,j,2),p]=changeImage2(a,b,length_Z);
         %a=N(i,j,3);
         %[T(i,j,3),p]=changeImage2(a,b,length_Z);
         if(d==key)
             break;
         end
         if(p==1)
          d=d+1;
         end
      end
      if(d==key)
          break;
      end
end

how can i fix it ?

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Answer 1

Geoff Hayes 2014-11-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163943-i-m-working-with-image-i-cant-load-512-512-image#answer_159936

在 MATLAB Online 中打开

Farjana - the error message is occurring because of the line of code

a=N(i,j,3);

which is trying to access the third dimension of the matrix N when it only has two dimensions (your input image is grayscale, 256x256, and not colour, 256x256x3). Either change the line of code to

a=N(i,j);

or select a colour image.

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Image Analyst 2014-11-24

Farjana, the code was meant for color images. Since you have grayscale images, you commented out the color part but that's not all you need to do. You need to change the line of code that Geoff told you to. You probably also want to change T(i,j,3) to T(i,j).

Farjana Yeasmin 2014-11-24