Comparison between the values ​​of pixels in the image matrix

This code to divide the image to Blocks After the divided we take the avrege of each block with size 4*4 pixel and store values in new matrix image called (a) Then we want to compare the value of each pixel in matrix (a) with all the other values of pixels in the same matrix when we find value equal another values in the same matrix put in other postion of those value zero. after that we store in the new image in first row we store the value of each pixel and in another row we store the number of pixel equals and its postion

if true
  Range_Image=rgb2gray(imread('data.jpg'));
  [m n]=size(Range_Image); Nbrx = floor(m./4);
  Nbry = floor(n./4); Nd=1;
  for i=1:Nbrx
      for j=1:Nbry
          Mat=Range_Image((i-1)*4+1:i*4,(j-1)*4+1:j*4);
          sumpixel=sum(Mat(:));
          avg=floor(sumpixel./16);
          a(i,j)=avg;
          %subplot(Nbrx,Nbry,Nd);

            Nd=Nd+1;
        end
    end

    figure(1),imshow(a,[])
    count=0;
    [x y]=size(a); Nbrx = floor(x);
    Nbry = floor(y);

    for i=1:Nbrx
        for j=1:Nbry
            a(i,j);
            count=0;
            if (a(i,j) ~= 0)
                for z=1:Nbrx
                    for k=1:Nbry

                        if (a(i,j)==a(z,k))
                            count=count+1;
                            b(1,j)=a(i,j);
                            b(2,j)=count;
                            a(z,k)=0;

                        end
                    end
                end
            end
        end
    end
end

[viswanath reddy]

i want code for comparison of pixels in an image by considering a 3*3 matrix. for each pixel, a 3*3 matrix around the pixel should be considered and the pixel must be compared with both the diagonals of the considered 3*3 matrix, whether the pixel is greater than all the diagonal elements or not?

[Image Analyst]

I think you meant to post this as your own new question rather than to send this to wissa as a comment to her. Please do so and we'll answer there.

Answer 1

[Image Analyst]

I'm not sure I follow the grammar of this sentence: "Then we want to compare the value of each pixel in matrix (a) with all the other values of pixels in the same matrix when we find value equal another values in the same matrix put in other postion of those value zero. " I'm also not sure if you have a question or not - you didn't ask one. But I'd guess that it may be unlikely the average of one block will exactly equal the average of another block. Thus you will have to read an understand this FAQ: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[wissa amer]

For example: I have the following matrix

    34  56  67 255
    56  90  80 34
    47  34  80 235

I want to compare the value of each pixel with all other values When I find a similar value, instead of the old value, set it to zero. The matrix becomes as follows

   34   56   67  255
   56   90   80  0
   47   0    80  235

This is for the first pixel and when I find other similar value added to counter 1 count=count+1;

[Iain]

 m % your matrix
 compared = m == m(i,j);
 compared(i,j) = false;
 count = sum(compared(:));
 m(compared) = 0;

[Image Analyst]

Entisar, why do you want to do this thing? What will it accomplish for you?

[wissa amer]

I AM WORK TO DO WAY TO IMAGE COMPRESSION