White and black line follower

need help to develop VI in labview for line follower which will track black path only and avoid white line , can any one please help me with VI ? 
Attachments:
line follower.vi ‏8 KB

Middle School and High School students involved in FIRST Robotic have been doing this and have posted examples
http://www.usfirst.org/
Middle School Lego League Robotic
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=lego%20line%20follower
High School FRIST Robotic
https://decibel.ni.com/content/docs/DOC-14730
http://www.chiefdelphi.com/forums/showthread.php?t=93826&highlight=Line+follow
http://www.chiefdelphi.com/forums/showthread.php?t=91391&highlight=Line+follow
http://www.chiefdelphi.com/forums/showthread.php?t=90386&highlight=Line+follow
Omar

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