Remove background from image

Hi, i'd like to remove the background from RGB images. Since this have to be done in a lot of images i'd like to automate this task.

Original image with background:

The image should be transformed as this one below, without background.

I have cropped the images as the first one, however, i'm getting in trouble to remove the background.

Answer 1

[DGM]

% read the image
inpict = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/217934/mx01.jpeg');

% you could use color-based thresholding
% but with the low contrast and chroma, JPG damage is an obstacle
% in this case, there's plenty of object contrast in luma alone
Ymask = rgb2gray(inpict)<128;
Ymask = ~imfill(Ymask,'holes');

% adjust white level
inlevels = stretchlim(inpict).*[0; 1];
outpict = imadjust(inpict,inlevels);

% apply mask
outpict(repmat(Ymask,[1 1 3])) = 255;

imshow(outpict)