Read into the image, the image preprocessing, edge detection followed, the resulting image binarization, and then hough transform to get round the border, this graph with the original overlay, enhance edges

实训\BBS.sql
....\实讯第二次\bbsite\Default.aspx
....\..........\......\Default.aspx.cs
....\..........\......\Details.aspx
....\..........\......\Details.aspx.cs
....\..........\......\edit.aspx
....\..........\......\edit.aspx.cs
....\..........\......\img\1.gif
....\..........\......\...\10.gif
....\..........\......\...\11.gif
....\..........\......\...\12.gif
....\..........\......\...\13.gif
....\..........\......\...\14.gif
....\..........\......\...\15.gif
....\..........\......\...\16.png
....\..........\......\...\17.png
....\..........\......\...\18.png
....\..........\......\...\2.gif
....\..........\......\...\3.gif
....\..........\......\...\4.gif
....\..........\......\...\5.gif
....\..........\......\...\5742370999874696121.png
....\..........\......\...\6.gif
....\..........\......\...\7.gif
....\..........\......\...\8.gif
....\..........\......\...\9.gif
....\..........\......\...\logo.JPG
....\..........\......\log.aspx
....\..........\......\log.aspx.cs
....\..........\......\logoin.aspx
....\..........\......\logoin.aspx.cs
....\..........\......\register.aspx
....\..........\......\register.aspx.cs
....\..........\......\web.config
....\..........\......\write.aspx
....\..........\......\write.aspx.cs
....\..........\SQLQuery1.sql
....\..........\bbsite\img
....\..........\bbsite
....\实讯第二次
实训

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