function?X?=?extract_image（image_file_name）
%EXTRACT_IMAGE?Extract?features?from?image
%???Inputs:
%???????image_file_name:?filename?of?image
%???Outputs:
%???????X:?140x5?matrix?5?digits?in?an?image?each?digit?is?a?140x1?vector.

m?=?imread（image_file_name）;
d1?=?reshape（m（5:18?5:14）?140?1）;
d2?=?reshape（m（5:18?14:23）?140?1）;
d3?=?reshape（m（5:18?23:32）?140?1）;
d4?=?reshape（m（5:18?32:41）?140?1）;
d5?=?reshape（m（5:18?41:50）?140?1）;
X?=?[d1?d2?d3?d4?d5];

end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-25?08:53??knn\
?????文件???????19178??2018-12-24?03:14??knn\hack_data.npz
?????目錄???????????0??2018-12-24?03:11??knn\__pycache__\
?????文件?????????533??2018-12-22?03:01??knn\__pycache__\show_image.cpython-36.pyc
?????文件?????????614??2018-12-24?03:10??knn\__pycache__\hack.cpython-36.pyc
?????文件?????????977??2018-12-23?14:38??knn\__pycache__\knn_plot.cpython-36.pyc
?????文件?????????836??2018-12-24?02:07??knn\__pycache__\extract_image.cpython-36.pyc
?????文件????????1242??2018-12-24?03:11??knn\__pycache__\knn.cpython-36.pyc
?????文件?????????416??2018-12-21?07:06??knn\__pycache__\mkdata.cpython-36.pyc
?????文件?????????482??2018-11-20?13:10??knn\extract_image.m
?????文件?????????563??2018-12-24?03:10??knn\hack.py
?????目錄???????????0??2018-12-21?05:33??knn\.ipynb_checkpoints\
?????文件????????2720??2018-12-20?14:01??knn\.ipynb_checkpoints\knn_exp-checkpoint.ipynb
?????文件??????????72??2018-12-21?05:33??knn\.ipynb_checkpoints\Untitled-checkpoint.ipynb
?????文件??????????83??2018-11-20?13:10??knn\knn_exp.m
?????文件?????????487??2018-12-19?10:55??knn\knn_plot.m
?????文件????????1674??2018-12-24?03:10??knn\knn.py
?????文件?????????418??2018-11-20?13:10??knn\knn.m
?????文件??????161559??2018-12-20?08:09??knn\題目.pdf
?????文件??????147876??2018-12-24?03:15??knn\knn_exp.ipynb
?????目錄???????????0??2018-12-24?03:14??knn\data\
?????文件????????2304??2018-12-24?03:13??knn\data\73527.aspx
?????文件????????2299??2018-12-23?14:32??knn\data\50373.aspx
?????文件????????2297??2018-12-23?14:31??knn\data\14086.aspx
?????文件????????2317??2018-12-23?14:33??knn\data\31645.aspx
?????文件????????2307??2018-12-23?14:33??knn\data\33154.aspx
?????文件????????2313??2018-12-24?03:11??knn\data\70687.aspx
?????文件????????2324??2018-12-23?14:31??knn\data\22200.aspx
?????文件????????2302??2018-12-24?03:14??knn\data\38525.aspx
?????文件????????2309??2018-12-24?03:12??knn\data\35478.aspx
?????文件????????2302??2018-12-23?14:34??knn\data\44230.aspx
............此處省略25個文件信息