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How to extract the hand out of the background? (homework assignment)

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Tu Nguyen
Tu Nguyen 2022-3-12
编辑： DGM 2022-3-12
Dear all, I want 'my output' image like exactly 'ouput' image. I followed step by step on the intrunction posted here.
Can anyone help me please?
clc;
close all;
clear all;
I1 = imread('hands.png');
I2 = imread('balcony.png');
gr = im2gray(I1);
threshold_value = graythresh(gr);
bw = im2bw(gr);
binary = bw<threshold_value;
binary_I = imfill(binary,'holes');
imshow(binary_I);
mask = I1;
mask(~bw) = 0;
ig = im2gray(mask);
output = bitand(ig,I2);
imshow(output);

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采纳的回答

DGM
DGM 2022-3-12
编辑：DGM 2022-3-12
Ran in:
If you're trying to create the composite image:
FG = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/924699/hands.png');
BG = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/924694/balcony.png');
mask = FG<210; % basic thresholding
outpict = uint8(double(FG).*mask + double(BG).*(~mask)); % compose image
imshow(outpict)
Alternatively, you can go to extra lengths to improve the masking:
mask = FG<210; % same thresholding
mask = imerode(mask,ones(7)); % shrink mask to remove edge banding
mask = imgaussfilt(double(mask),1.5); % feather mask back toward original edges
outpict = uint8(double(FG).*mask + double(BG).*(1-mask)); % compose
imshow(outpict)

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