how to remove shadow from the rgb image

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syed salma banu s 2018-12-29

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评论： Keerthi D 2020-7-2

Hi,

I am doing my project in leaf disease detection and classification. i have to do background removal for image preprocessing .but still i got the shadow of leaf in the image. i am struggling to remove the shadow .please can anyone suggest me the appropriate solution .

This is my initial iimage

my output image

and my code to remove the background

I=imread('sample1.jpg');
imshow(I);
I=im2double(I);
img=rgb2gray(I);
imshow(img);
size(img);
mask = zeros(size(img));
mask(25:end-25,25:end-25) = 1;
maskimg=activecontour(img,mask,300);
imshow(maskimg);
maskimg=im2uint8(maskimg);
maskimg=imcomplement(maskimg);
imshow(maskimg);
maskimg=im2double(maskimg);
channel1 = maskimg(:,:,1);
channel2 = maskimg(:,:,1);
channel3 = maskimg(:,:,1);
actualImg = cat(3,channel1,channel2,channel3);
imshow(actualImg);
res=imadd(I,actualImg);
imshow(res);
res1=rgb2lab(res);
imshow(res1);
res1=imadd(I,res);
imshow(res1);

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回答（2 个）

Image Analyst 2018-12-29

1
链接

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https://ww2.mathworks.cn/matlabcentral/answers/437554-how-to-remove-shadow-from-the-rgb-image#answer_354288

testRGBImage.m

Use the Color Thresholder on the Apps tab of the tool ribbon. Then fill holes and take the largest blob. Erase the background, if you want to. See attached m-file.

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Damodar Reddy Ch 2019-6-14

Sir, how to get the backgroung part (apart from leaf) in white color.

Image Analyst 2019-6-14

在 MATLAB Online 中打开

You can say

out = rgbImage % Initialize output image.
mask3d = cat(3, mask, mask, mask); % Create mask
out(~mask3d) = 255; % Apply the mask.

Now out should have white everywhere outside the leaf.

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Keerthi D 2020-6-29

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The complex leaf image background is first removed to get a clear leaf sample before further processing. So l using here background elimination mathod. Algorithm is, 1.Manually select ROI in I and store it in R. 2.generate binary mask. 3. set J to I. 4.for each pixel (m,n)in I 5. if pixel(m,n) is in R 6. set J(m,n) to 1. 7. else 8. Set J(m,n) to 0. 9.compute complement J'. 10.set I to I+J'. 11.Crop I to eliminate unwanted image parts. Please send me it's Matlab code. My email ID : keerthidev36@gmail.com </matlabcentral/answers/uploaded_files/323605/Screenshot_20200629_165725.jpg>