[Insight-users] Edge Linking Problem
CSPL
hyd2_affable at sancharnet.in
Sat, 13 Mar 2004 11:49:28 +0530
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Hello Group,
I have a requirement of segmenting(extracting) an object of interest =
from an image and the method I am supposed to use is the following:
=20
1. Find the edges of the required object.
2. Given the edges of the object, fill or some how form the complete =
object.
i.e, define all pixels of the object whose edges we have found in step =
1.
To achieve this, I used Canny Edge Detection filter for finding the =
edges.
Here is the actual problem:=20
The edges formed by the filter are not connected. The object is =
surrounded by broken edge lines.
How do I get the completely connected edge of the object? If there is a =
way to link these broken edges, on what factor will the accuracy of this =
edge linking depend?
The documentation for Canny Edge Detection Filter says the following:
"TODO : Edge-linking will be added when an itk connected component =
labeling algorithm is available."
"ConnectedComponentImageFilter" is already available in ITK. Is this =
the class being referred to in the above line? If it is the same, then =
how can I use it in this situation?
Is it possible to move to the second step without obtaining the =
complete edge of the object?
Regards,
Rama Krishna.
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<DIV><FONT face=3DArial size=3D2>Hello Group,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2> I have a requirement of=20
segmenting(extracting) an object of interest from an image and the =
method I am=20
supposed to </FONT><FONT face=3DArial size=3D2>use is the=20
following:<BR> <BR> 1. Find the edges of the required=20
object.<BR> 2. Given the edges of the object, fill or some how form =
the=20
complete object.<BR> i.e, define all pixels of the object =
whose edges=20
we have found in step 1.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> To achieve this, I used Canny =
Edge Detection=20
filter for finding the edges.<BR> Here is the actual problem: =
<BR> The=20
edges formed by the filter are not connected. The object is surrounded =
by=20
broken edge lines.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> How do I get the completely =
connected edge of=20
the object? If there is a way to link these broken edges, on what =
</FONT><FONT=20
face=3DArial size=3D2>factor will the accuracy of this edge linking=20
depend?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> The documentation for Canny Edge =
Detection=20
Filter says the following:<BR> "TODO : Edge-linking will be added =
when an=20
itk connected component labeling algorithm is available."</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> "ConnectedComponentImageFilter" =
is already=20
available in ITK. Is this the class being referred to in the above =
line? If=20
it is the same, then how can I use it in this situation?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> Is it possible to move to the =
second step=20
without obtaining the complete edge of the object?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Regards,<BR>Rama=20
Krishna.</FONT></DIV></BODY></HTML>
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