Try this i am not sure if this will help you
I = imread(you image gows here);
[rows, columns, numberOfColorChannels] = size(I);
d = 255 * zeros(rows, columns, 3, 'uint8');
grayImage = rgb2gray(I);
imshow(grayImage);
hFH = imfreehand();
binaryImage = hFH.createMask();
bwimage = grayImage;
bwimage(~binaryImage) = 0;
for i = 1:rows
for j = 1:columns
if bwimage(i,j) ~ 0;
d(i,j,:)=I(i,j,:);
end
end
end
imshow(d);
