Illumination problem with lab based segmentation..

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Sabanam 2014-4-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126148-illumination-problem-with-lab-based-segmentation

评论： Sabanam 2014-4-21

When i am thresolding my images with lab model thresold it won't segment disease from normal area and when i am putting some thresold sometimes it work for disease classification but not for ripe and unripe mangoes..

see the code...

if true
  I=imread('1.jpg')
  BW=hsv2seg(I);% segmentation for background
  cform = makecform('srgb2lab');
  lab = applycform(I,cform);
  maskedImage = bsxfun(@times, lab, cast(BW, class((lab))));
  figure,subplot(1,4,1),imshow(I),title(img(k).name);
  subplot(1,4,2),imshow(BW),title('BW image');
  subplot(1,4,3),imshow(maskedImage),title('masked image');
  l=maskedImage(:,:,1);
  a=maskedImage(:,:,2);
  b=maskedImage(:,:,3);
  mask = ((a > 128 & b > 128 & l >= 128 & abs(a-b) < 10) | ((a <= 128 & b >= 128)));
  subplot(1,4,4),imshow(mask),title('mask image');
end

https://www.dropbox.com/sh/a6ugue9rc93yzau/j3FpLgpvdD

above db images are not working for given thresold.i need output like

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回答（1 个）

Image Analyst 2014-4-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126148-illumination-problem-with-lab-based-segmentation#answer_133682

What is not working? You shouldn't use mask again in the third column since it means something totally different than you first used it for, which was the overall mask of mango and background. But the badly-named mask in the third column looks like it shows in white the areas that are yellow and green and the areas that are not yellow and green as black. So what's the problem with that?

For reference, I answered the prior question about how to get the mask in this question though perhaps I shouldn't have.

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Image Analyst 2014-4-18

编辑：Image Analyst 2014-4-18

在 MATLAB Online 中打开

BGCorrect_demo.m

If you read the comments/instructions at the beginning of the demo you'll see

% Then models it to a 4th order polynomial in both directions
% using John D'Errico's File Exchange submission:
% http://www.mathworks.com/matlabcentral/fileexchange/34765-polyfitn

It looks like you did not download polyfitn from the link I gave you. Did you? If not, please do so. I've attached a new demo that checks for that.

Sabanam 2014-4-21