Comparison between the values of pixels in the image matrix

Question

wissa amer 2013-6-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78683-comparison-between-the-values-of-pixels-in-the-image-matrix

评论： Image Analyst 2019-1-10

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

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viswanath reddy 2019-1-10

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 2019-1-10

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.

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Answer 1

Image Analyst 2013-6-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78683-comparison-between-the-values-of-pixels-in-the-image-matrix#answer_88426

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