Date: Jan 18, 2013 4:10 AM
Author: subramanya
Subject: boundary tracing

Hi,

I am trying to trace boundary of which some examples are shown

https://lh3.googleusercontent.com/-2szuD2V-M_M/UPkOKg4_ZUI/AAAAAAAAAFU/MjWtniE_nMQ/w713-h487-p-k/a1.png
https://lh5.googleusercontent.com/-g79JiXZV5Xs/UPkOOnzZhgI/AAAAAAAAAFk/C_KVYNK0nmE/w353-h239-n-k/a2.png
https://lh6.googleusercontent.com/-3ayyAaCmcwQ/UPkOOsYCCrI/AAAAAAAAAFg/D_4x1HR6jH8/w291-h239-n-k/b1.png
https://lh6.googleusercontent.com/-L2L-jFiO-7E/UPkOOpleXlI/AAAAAAAAAFc/K8T7cshpo9c/w294-h242-n-k/b2.png
https://lh6.googleusercontent.com/-jr0jEN3MRFg/UPkOPiNCgrI/AAAAAAAAAFo/muLa9MfuYXc/w350-h242-n-k/c1.png
https://lh5.googleusercontent.com/-6tBtMx4DDk0/UPkOPr5pT1I/AAAAAAAAAFs/MvRMSmH0VSc/w436-h302-n-k/c2.png

The boundaries in red color are what expected. Is there any way to do this?

thanks