How to eliminate uneven illumination from an imgae with respect to another image?

Question

aswathy nair 2015-5-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/219037-how-to-eliminate-uneven-illumination-from-an-imgae-with-respect-to-another-image

回答： B.k Sumedha 2015-5-27

One of my approach is like this. I am not sure about this approach

    1) There are two images im1 and im2. Extract the R G B content of im1.
    2)Calculate the normalized value for each content
    3)Reform a color image.
    4)Repeat the process for im2
    5)Compare each pixel and replace the content of im2 with im1.

I tried to normalize one of the image but didn't get a good output

Image_rgb = imread('aswathy_33_crop.jpg');
Image_rgb = double(Image_rgb);
figure;imshow(uint8(Image_rgb));
    Image_red = Image_rgb(:,:,1);
  Image_green = Image_rgb(:,:,2);
  Image_blue = Image_rgb(:,:,3);
   [row,col] = size(Image_rgb(:,:,1));
   for y = 1:row 
      for x = 1:col 
     Red = Image_red(y,x);
     Green = Image_green(y,x);
     Blue = Image_blue(y,x);
      if(Red == 0 && Green==0 && Blue==0)
          Red = 1;
          Green = 1;
          Blue = 1;
      end
        NormalizedRed = Red/(Red + Green + Blue);
        NormalizedGreen = Green/(Red + Green + Blue);
        NormalizedBlue = Blue/(Red + Green + Blue);
   Image_red(y,x) = NormalizedRed;
   Image_green(y,x) = NormalizedGreen;
   Image_blue(y,x) = NormalizedBlue;
     end
  end
  Image_rgb(:,:,1) = Image_red;
  Image_rgb(:,:,2) = Image_green;
  Image_rgb(:,:,3) = Image_blue;
     new_image1 = cat(3, Image_rgb(:,:,1) ,Image_rgb(:,:,2), Image_rgb(:,:,3));
     figure; imshow(uint8(255*new_image1));

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B.k Sumedha 2015-5-27

And also i didnt find any images here:(

aswathy nair 2015-5-27

Sorry I forgot to save the edit. Can you please suggest me whether my approach is correct or not based on my question.

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Answer 1

B.k Sumedha 2015-5-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/219037-how-to-eliminate-uneven-illumination-from-an-imgae-with-respect-to-another-image#answer_180647

在 MATLAB Online 中打开

Image=imread('aswathy_33_crop.jpg');  
Image_rgb =Image;
  Image_rgb = imresize(Image_rgb, [400 400]);
  Image_rgb = double(Image_rgb);
  %figure;imshow(uint8(Image_rgb));
    Image_red = Image_rgb(:,:,1);
    Image_green = Image_rgb(:,:,2);
    Image_blue = Image_rgb(:,:,3);
    %figure;imshow(uint8(Image_red));
    [row,col] = size(Image_rgb(:,:,1));
    for y = 1:row %-->numberof rows in image
       for x = 1:col %-->number of columns in the image
          Red = Image_red(y,x);
          Green = Image_green(y,x);
          Blue = Image_blue(y,x);
        NormalizedRed = Red/sqrt(Red^2 + Green^2 + Blue^2);
        NormalizedGreen = Green/sqrt(Red^2 + Green^2 + Blue^2);
        NormalizedBlue = Blue/sqrt(Red^2 + Green^2 + Blue^2);
        Image_red(y,x) = NormalizedRed;
        Image_green(y,x) = NormalizedGreen;
        Image_blue(y,x) = NormalizedBlue;
       end
    end
    Image_rgb(:,:,1) = Image_red;
    Image_rgb(:,:,2) = Image_green;
    Image_rgb(:,:,3) = Image_blue;
    Image_rgb = Image_rgb .* Image_rgb;
  imshow(Image_rgb);