Removing the shadow from image

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kash 2012-7-13

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https://ww2.mathworks.cn/matlabcentral/answers/43541-removing-the-shadow-from-image

评论： Image Analyst 2020-7-1

I have an image in which i have to remove the shadows from it ,please help how to process.I have uploaded the Image

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Answer 1

Image Analyst 2012-7-13

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https://ww2.mathworks.cn/matlabcentral/answers/43541-removing-the-shadow-from-image#answer_53420

Go to Section 8.3.10.1 here: http://iris.usc.edu/Vision-Notes/bibliography/contentssegment.html#2-D%20Region%20Segmentation%20Techniques,%20Snakes,%20Active%20Contours Pick an algorithm and code it up.

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kash 2012-7-13

编辑：Oleg Komarov 2012-9-3

在 MATLAB Online 中打开

I tried using the code

I = imread('imagesh1.bmp');
       J = im2double(I);
        R = J(:,:,1);
        G = J(:,:,2);
        B = J(:,:,3);
       [len,wid] = size(R);
       % Generation of 2-D Log Chromaticity Image.
       for i = 1:len
          for j = 1:wid
             if ((R(i,j)*G(i,j)*B(i,j))~= 0)
                c1(i,j) = R(i,j)/((R(i,j)*G(i,j)*B(i,j))^(1/3));
                c2(i,j) = G(i,j)/((R(i,j)*G(i,j)*B(i,j))^(1/3));
                c3(i,j) = B(i,j)/((R(i,j)*G(i,j)*B(i,j))^(1/3));
             else
                c1(i,j) = 1;
                c2(i,j) = 1;
                c3(i,j) = 1;
          end
      end
  end
rho1 = mat2gray(log(c1));
rho2 = mat2gray(log(c2));
rho3 = mat2gray(log(c3));
X1 = mat2gray(rho1*1/(sqrt(2)) - rho2*1/(sqrt(2))); %(1/sqrt(2); -1/sqrt(2); 0)
X2 = mat2gray(rho1*1/(sqrt(2)) + rho2*1/(sqrt(2)) - rho3*2/(sqrt(6))); %(1/sqrt(6); 1/sqrt(6); -2/sqrt(6))
theta = 10;
InvariantImage = cos(theta*pi/180)*X1 + sin(theta*pi/180)*X2;
imshow(InvariantImage)

but could not get the correct answer,i need the output as in the link

can u tell where had made mistake please

Keerthi D 2020-7-1

I didn't get

Image Analyst 2020-7-1

Maybe someone else you work with could understand it and explain it to you? Otherwise, pick a different shadow removal algorithm that you can understand.

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Removing the shadow from image

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Removing the shadow from image

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