i am unable to zigzag scan image

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juveria fatima 2018-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391174-i-am-unable-to-zigzag-scan-image

评论： juveria fatima 2018-3-31

i am using this code kindly help me to solve

https://in.mathworks.com/matlabcentral/fileexchange/56332-zigzag-scan-any-n-n-matrix--bloc-of-image-

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juveria fatima 2018-3-28

在 MATLAB Online 中打开

am using lena image

X=imread('lena1.jpg');
  imshow(X);
  function Vect=ZigZagscan(X)
  % ZigZagscan Transform an matrix to a vector using Zig Zag Scan.
  %    
  % VECT = ZIGZAGSCAN(MATRIX) reorganize the input Matrix and output it as a vector.
  %    
  %    Example:
  %          X=[1 2 3
  %             4 5 6
  %             7 8 9]
    %     X =
    %        1  2  3
    %        4  5  6
    %        7  8  9
    %
    %     ZigZagscan(X)=
    %                   1  2  4  7  5  3  6  8  9
    %
    %**************************************************************************
    % Autors : Said BOUREZG   
    % Engineer on Electronics  option: Communication .
    % Date : 08.03.2016
    % Filename ZigZagscan.m  
    % Please contribute if you find this software useful.
    % Report bugs to: said.bourezg@yahoo.fr
    % Adress:                         Said BOUREZG
    %                                El Hodhna Street
    %                                 28038 Tarmount
    %                                M'sila - Algeria 
    % Email: said.bourezg@yahoo.fr
    % Mobile: +213 796 018049 
    % http://
    % If you can improve this code furtherly or add ...,
    % please let me know. Thanks
    %**************************************************************************
    % X=imread('pingu.jpg');
    % imshow(X);
    [~, N]=size(X);
    Vect=zeros(1,N*N);
    Vect(1)=X(1,1);
    v=1;
    for k=1:2*N-1
        if k<=N
              if mod(k,2)==0
               j=k;
                  for i=1:k
                  Vect(v)=X(i,j);
                  v=v+1;j=j-1;    
                  end
              else
                  i=k;
                  for j=1:k   
                  Vect(v)=X(i,j);
                  v=v+1;i=i-1; 
                  end
               end
        else
               if mod(k,2)==0
                p=mod(k,N); j=N;
                    for i=p+1:N
                    Vect(v)=X(i,j);   
                    end
                    v=v+1;j=j-1; 
               else
                p=mod(k,N);i=N;
                     for j=p+1:N   
                     Vect(v)=X(i,j);
                     v=v+1;i=i-1; 
                     end
                end
        end
    end
    end

Walter Roberson 2018-3-31

Why are you reshaping Red into a 3D array? Why are you reshaping it at all? Why not just ZigZagscan(red) ?

juveria fatima 2018-3-31

thank you very much, it worked.

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Answer 1

Guillaume 2018-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/391174-i-am-unable-to-zigzag-scan-image#answer_312377

编辑：Guillaume 2018-3-28

在 MATLAB Online 中打开

You cannot copy the body of a function into your code and expect it to work like a script. The function needs to be in its own m-file which you call from your script. Hence your script should only be:

X=imread('lena1.jpg');
imshow(X);
v = ZigZagScan(X);

Saying that, this ZigZagScan function is not particularly well written and assumes the input is a square matrix.

Below, a simpler code. Note this is also a function, so you'll have to put it into its own m-file named antizigzag.m

function v = antizigzag(X)
   %author: G. de Sercey, University of Brighton
   %BSD license
   %input: X a 2D matrix, not necessarily square
   %output: v a row vector of the anti-diagonals of the matrix scanned in a zigzag fashion
     validateattributes(X, {'numeric'}, {'2d'});
     X = fliplr(X);  %flip X so the anti-diagonals become diagonals
     v = arrayfun(@(d) diag(X, d), size(X, 2)-1:-1:1-size(X, 1), 'UniformOutput', false);  %get the diagonals
     v(1:2:end) = cellfun(@flip, v(1:2:end), 'UniformOutput', false);  %flip odd diagonals
     v = vertcat(v{:}).';  %concatenate the whole lot in a row vector
  end

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Walter Roberson 2018-3-30

jpeg images are 3 dimensional more than 99.9% of the time. You cannot apply zigzag or anti-zigzag routines to them as a whole: you can only apply it to one channel at a time, or else reshape the whole thing as if it were 2D and process the reshaped version. Or convert to grayscale and work with that.

juveria fatima 2018-3-30

在 MATLAB Online 中打开

as u said to apply on one channel i tried

am getting this error

Error in ZigZagscan (line 41)
Vect=zeros(1,N*N);
Error in zz (line 7)
 Vect= ZigZagscan(X);

this way am applying one channel to zigzag scan

A= imread('lena1.jpg');
Red = A(:,:,1);
X = reshape(uint8(Red), [1 size(Red)]);
   Vect= ZigZagscan(X);

i am unable to find the error please help me out

this is working very fine if i input this

X=[1 2 3
            4 5 6
            7 8 9]

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i am unable to zigzag scan image

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i am unable to zigzag scan image

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