Cant change the background using image segmentaton

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?

[Neuropragmatist]

I dont have either of the images you are loading here so I can't really help you - I don't know if the background is white or black for instance.

But I also don't really understand the process, you load one image I and do some morphological processes on it to make image L, then load another image called background and then you combine them by substituting the background image values with original image values according to the logical matrix L... that doesn't seem right, surely you want to substitute the original image values with white according to L?

[Firecky Dwika]

you have any source i can read into? i really have no clue how to do it properly, please...

and i want to change the background of original image to white by combining the original image with the background....

[KALYAN ACHARJYA]

Please answer the followings (specifically)-

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

[Firecky Dwika]

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?

Answer 1

[Image Analyst]

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.

Answer 2

[Neuropragmatist]

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.

[Firecky Dwika]

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

[Image Analyst]

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.