function?edge_follow（I）
%edge_follow（I）用以跟蹤手的邊界
%I為輸入的二值圖像文件名
%im_edge.bmp是提取的邊沿圖像

imbw=imread（I）;
[MN]=size（imbw）;
Itemp=zeros（M+2N+2）;?
im_edge=Itemp;?????????????????????????????????????????????????????
Itemp（2:（M+1）2:（N+1））=imbw;


%im_edge?=?im_edge?-?imerode（im_edge[0?1?0?;?1?1?1?;?0?1?0]）;?%??????????????????
%im_edge?=?bwmorph（im_edge‘thin‘Inf）;???????????????????????????????????????????????

[rowcol]=find（Itemp1）;??????????????????????????????????????????????????????
x0=row;
y0=col;
ended=0;
MAJ=[6?6?0?0?2?2?4?4];?
direction=4;

while（ended==0）
????found_next=0;??????
?????while（found_next==0）
????????switch?mod（direction8）
????????????case?0
????????????????if?（Itemp（row?col+1）==1）
????????????????????row=row;
????????????????????col=col+1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?1;
????????????????if?（Itemp（row+1?col+1）==1）
????????????????????row=row+1;
????????????????????col=col+1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?2;
????????????????if?（Itemp（row+1?col）==1）
????????????????????row=row+1;
????????????????????col=col;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?3;
????????????????if?（Itemp（row+1?col-1）==1）
????????????????????row=row+1;
????????????????????col=col-1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?4;
????????????????if?（Itemp（row?col-1）==1）
????????????????????row=row;
????????????????????col=col-1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?5;
????????????????if?（Itemp（row-1?col-1）==1）
????????????????????row=row-1;
????????????????????col=col-1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?6;
????????????????if?（Itemp（row-1?col）==1）
????????????????????row=row-1;
????????????????????col=col;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????case?7;
????????????????if?（Itemp（row-1?col+1）==1）
????????????????????row=row-1;
????????????????????col=col+1;
????????????????????im_edge（rowcol）=1;
????????????????????found_next=1;
????????????????end;
????????????????
????????end

????????if?（found_next==0）?direction=direction+1;?end;
????????
????end
????
????if（and（（x0==row）（y0==col）））
????????ended=1;?
????end;
????%direction?=?mod（（direction+3）8）+1;
????direction?=?MAJ（（mod（direction8）+1））;
end
imwrite（im_edge‘im_edge.bmp‘‘bmp‘）;
figure;
imshow（im_edge）;

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????2857??2010-04-16?13:35??edge_follow.m

-----------?---------??----------?-----??----

?????????????????2857????????????????????1