Cant change the background using image segmentaton

Question

Firecky Dwika 2019-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/474840-cant-change-the-background-using-image-segmentaton

评论： Image Analyst 2019-8-16

Hello, im a beginner at MATLAB. I tried to change the background of the image to white and turns out the image become weird.

Here is the code i used:

I=imread('2.jpg');

imshow(I)

J=rgb2gray(I);

L= imbinarize(J);

L= imcomplement(L);

L= imfill(L,'holes');

L= bwareaopen(L,100);

str= strel('disk',5);

L= imerode(L,str);

figure, imshow(L);

Img2= imread('background.jpg');

R = I(:,:,1);

G = I(:,:,2);

B = I(:,:,3);

R2 = Img2(:,:,1);

G2 = Img2(:,:,2);

B2 = Img2(:,:,3);

R2(L) = R(L);

G2(L) = G(L);

B2(L) = B(L);

RGB = cat(3,R2,G2,B2);

figure, imshow(RGB);

Can anyone help me, please?

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KALYAN ACHARJYA 2019-8-6

编辑：KALYAN ACHARJYA 2019-8-6

Please answer the followings (specifically)-

What you have (please attach data/image)?
What you want?

Firecky Dwika 2019-8-8

编辑：Firecky Dwika 2019-8-8

these are the images i used.

i want to combine the original image with the second image, so i have a leaf with white background. but this is what i get:

Can you tell me what should i do?

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Answer 1

Image Analyst 2019-8-8

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freehand_masking_demo.m

Why do you think that code will identify background, whatever that is, in an image of a bunch of leaves? What is the background? All the other leaves except the central one? Anything not the brown spots? Whatever, your algorithm is not good. I suggest you just start by hand tracing whatever you think is background by adapting my attached masking demo.

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Answer 2

Neuropragmatist 2019-8-8

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This image looks like a real nightmare for edge detection etc and I don't know if you are really every going to get something satisfactory.

Do you need a robust automated method or is this just a once off?

If you need to do this a lot in future (for example if you want to collect images of samples for a scientific study) I would suggest photographing the leaf on a solid colour background - like a sheet of paper. That will allow you to do what you want much more easily, quickly and in a reliably automated way.

If this is a once off I would suggest (and this is going to sound like a joke but it isn't) using the 'remove background' feature in PowerPoint, or manually cutting the leaf out using software like MS paint (free), Inkscape (free) or Photoshop (not free).

Sorry can't be more help,

M.

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Firecky Dwika 2019-8-16

sorry for late reply, i did like what you suggest but the outcome doesnt change...

Image Analyst 2019-8-16

Explain how manually tracing or painting over the background to remove it, like you definitely said you tried, could NOT work? That doesn't make sense to us.

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