How to remove background from an image?

The general answer is obviously no. You are not going to find any code which will universally discern intent and isolate any arbitrary and undefined foreground region from any arbitrary and undefined background region in any one of countless unspecified "types" of images, many of which MATLAB can't even open.

The more magical properties a solution requires, the more certain it is to not exist.

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Answer 2

Deepak Gala 2017-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/155976-how-to-remove-background-from-an-image#answer_276729

This link might help! https://blogs.mathworks.com/loren/2015/06/24/how-do-you-modify-the-background-of-an-image/?s_tid=answers_rc2-1_p4_MLT

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Diah Junaidi 2018-8-11

在 MATLAB Online 中打开

I got this error: _ *Undefined function 'checkCC' for input arguments of type 'struct'.

Error in regionprops (line 180) checkCC(CC);

Error in bwpropfilt (line 63) props = regionprops(CC, attrib);

Error in bwareafilt (line 34) bw2 = bwpropfilt(bw, 'area', p, direction, conn);

Error in testbgremove (line 9) mask = bwareafilt(mask,1);*_

Here the code:

if true
  img = imread('C:\Users\diahj\OneDrive\Pictures\Data Test\11.jpg');
gray = rgb2gray(img);
SE  = strel('Disk',1,4);
morphologicalGradient = imsubtract(imdilate(gray, SE),imerode(gray, SE));
mask = im2bw(morphologicalGradient,0.03);
SE  = strel('Disk',3,4);
mask = imclose(mask, SE);
mask = imfill(mask,'holes');
mask = bwareafilt(mask,1);
notMask = ~mask;
mask = mask | bwpropfilt(notMask,'Area',[-Inf, 5000 - eps(5000)]);
showMaskAsOverlay(0.5,mask,'r');
h = impoly(imgca,'closed',false);
fcn = makeConstrainToRectFcn('impoly',get(imgca,'XLim'),get(imgca,'YLim'));
setPositionConstraintFcn(h,fcn);
gray = rgb2gray(img);
gray(~mask) = 255;
imshow(gray)
%(The image is of class uint8; 255 is the value of "white" for uint8 images.)
% Break down and mask the planes:
r = img(:,:,1);
g = img(:,:,2);
b = img(:,:,3);
r(~mask) = 255;
g(~mask) = 255;
b(~mask) = 255;
% Reconstruct the RGB image:
img = cat(3,r,g,b);
imshow(img)
shellMask = createShellMask(h,'thickness',3);
imshow(shellMask);
r = regionfill(r,shellMask);
g = regionfill(g,shellMask);
b = regionfill(b,shellMask);
img = cat(3,r,g,b);
imshow(img)
end

Vidhika Sirwani 2020-5-4

gives an error..

undefined variable showMaskAsOverlay

Image Analyst 2020-5-4

在 MATLAB Online 中打开

Try this:

% Display mask with 50% transparency over the "gray" image.
imshow(gray);
hold on;
h = image(255 * mask);
h.AlphaData = 0.5;

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Answer 3

shaadinama 2023-5-4

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155976-how-to-remove-background-from-an-image#answer_1229429

There are several ways to remove the background from an image and perform edge detection on the remaining object. Here are some methods:

Using a photo editing software like Adobe Photoshop or GIMP: You can use the selection tools like Magic Wand, Lasso, or Quick Selection to select the background and delete it. Then, use the Edge Detection filter or tool to highlight the edges of the remaining object.

Using online tools: There are many free online tools like remove.bg, Clipping Magic, or Canva that allow you to remove the background of an image automatically. After removing the background, you can use the image editor in these tools to apply edge detection on the remaining object.

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