plz help me sorting the error...

Question

angel 2013-4-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71875-plz-help-me-sorting-the-error

评论： Walter Roberson 2017-5-8

the code i wrote is:

S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...
                 0.375*f(y,x)+...
                 0.375*f(y,mod(x+p,N)+1)+...
                 0.125*f(y,mod(x+p*2+1,N)+...
                 0.125*f(mod(y-p-2,N)+1,x)+...
                 0.375*f(y,x)+...
                 0.375*f(mod(y+p,N)+1,x)+...
                 0.125*f(mod(y+p*2+1,N)+1,x));

here f() corresponds to my input image

error shown is:

   Attempted to access f(1,169.125); index must be a positive integer or logical.
 Error in dyadicAnalysis (line 29)
            S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...

here p=2^j-1; where j is a loop variable starts from 1 and end at log(N)/log(2)

N=sizef(1), sizef=size(f);

can anybody tell me what is the problem in it? i've tried floor but the error remains the same

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Answer 1

Image Analyst 2013-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/71875-plz-help-me-sorting-the-error#answer_82101

There is no 169.125'th element of a matrix. You can access element # 169 or 170, but if you want to get 169.125 then you'll have to do interpolation.

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angel 2013-4-13

在 MATLAB Online 中打开

 function [wx wy]=dwt2(f)
clc;
close all;
f=rgb2gray(imread('tank.jpg'));
sizeF=size(f);
N=sizeF(1);
J=log(N)/log(2);
wx=zeros(N,N,J+1);
wy=zeros(N,N,J+1);
lambdaTable=[0.15 1.12 1.03 1.01];
figure;
imshow(f);
title('original signal');
S=zeros(N,N);
figure;
j=0;
while j<J
    p=2^j-1;
    lambda=1;
    if j<4
        lambda=lambdaTable(j+1);
    end
    for y=1:N
        for x=1:N
            wx(y,x,j+1)=(-2*f(y,x)+...
                          2*f(y,mod(x+p,N)+1))/lambda;
            wx(y,x,j+1)=(-2*f(y,x)+...
                          2*f(mod(y+p,N)+1,x))/lambda;                     
            S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...
                   0.375*f(y,x)+...
                   0.375*f(y,mod(x+p,N)+1)+...
                   0.125*f(y,mod(x+p*2+1,N)+...
                   0.125*f(mod(y-p-2,N)+1,x)+...
                   0.375*f(y,x)+...
                   0.375*f(mod(y+p,N)+1,x)+...
                   0.125*f(mod(y+p*2+1,N)+1,x));
        end
    end
    subplot(J,2,j*2+1);
    imshow(wx(:,:,j+1),[min(min(wx(:,:,j+1))) max(max(wx(:,:,j+1)))]);
    subplot(J,2,j*2+2);
    imshow(wy(:,:,j+1),[min(min(wy(:,:,j+1))) max(max(wy(:,:,j+1)))]);
    f=S;
    j=j+1;
end

%w(:,:,J+1)=S; figure; imshow(S,256);

angel 2013-4-14

编辑：angel 2013-4-14

在 MATLAB Online 中打开

sir i've used the dubugger the above error i sorted it out but the error given below i didnt

 Error using imshow>preParseInputs (line 385)
The syntax IMSHOW(I,N) has been removed.
 Error in imshow (line 194)
  varargin_translated = preParseInputs(varargin{:});
 Error in dyadicAnalysis (line 56)
imshow(S,256);
 385     error(message('images:removed:syntaxNoReplacement','IMSHOW(I,N)'))
K>>

the following is my code

function [wx wy]=dwt2(f)
clc;
close all;
f=rgb2gray(imread('tank.jpg'));
sizeF=size(f);
N=sizeF(1);
J=ceil(log(N)/log(2));
wx=zeros(N,N,J+1);
wy=zeros(N,N,J+1);
lambdaTable=[0.15 1.12 1.03 1.01];
figure;
imshow(f);
title('original signal');
S=zeros(N,N);
figure;
j=0;
while j<J
  p=2^j-1;
  lambda=1;
  if j<4
      lambda=lambdaTable(j+1);
  end
  for y=1:N
      for x=1:N
          wx(y,x,j+1)=(-2*f(y,x)+...
                        2*f(y,mod(x+p,N)+1))/lambda;
          wx(y,x,j+1)=(-2*f(y,x)+...
                        2*f(mod(y+p,N)+1,x))/lambda;      
          S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...
                 0.375*f(y,x)+...
                 0.375*f(y,mod(x+p,N)+1)+...
                 0.125*f(y,mod(x+p*2+1,N)+1)+...
                 0.125*f(mod(y-p-2,N)+1,x)+...
                 0.375*f(y,x)+...
                 0.375*f(mod(y+p,N)+1,x)+...
                 0.125*f(mod(y+p*2+1,N)+1,x);
      end
  end
  dbstop if error
  subplot(J,2,j*2+1);
  imshow(wx(:,:,j+1),[min(min(wx(:,:,j+1))) max(max(wx(:,:,j+1)))]);
  subplot(J,2,j*2+2);   % showing error
  imshow(wy(:,:,j+1),[min(min(wy(:,:,j+1))) max(max(wy(:,:,j+1)))]);
  f=S;
  j=j+1;
end

%w(:,:,J+1)=S; figure; imshow(S,256);

problem in the imshow function plz tell me what should i modify in the code so that my code can work fine

reply soon

Aqsa Ali 2017-5-8

Error using imshow>preParseInputs (line 425) IMSHOW expected at least 1 input argument but was called instead with 0 input arguments.

Error in imshow (line 214) varargin_translated = preParseInputs(varargin{:}); while running the code i am facing this error please help me in sorting out this error

Walter Roberson 2017-5-8

Aqsa Ali: which code are you using? Please post it.

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plz help me sorting the error...

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plz help me sorting the error...

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