[Insight-users] Find largest connected object in a Volume
Miller, James V (Research)
millerjv at crd . ge . com
Fri, 27 Jun 2003 13:33:38 -0400
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In Code/BasicFilters there are two classes ConnectedComponentImageFilter and
HardConnectedComponentImageFilter. The former is a rewrite of the latter to
use more of the ITK infrastructure. The latter may be removed soon.
The ConnectedComponentImageFilter will use 6-connectivity in a volume to
label the objects in the volume. Each connected object will have a unique
label.
However, this does not extract the largest connected object. You would need
a separate filter (that does not exist yet) to scan through the label map
and extract the largest object. As Luis suggested, you could a histogram of
the label map to determine which object is the "largest".
-----Original Message-----
From: cspl [mailto:affable at hd2 . dot . net . in]
Sent: Friday, June 27, 2003 2:19 AM
To: insight-users at itk . org
Subject: [Insight-users] Find largest connected object in a Volume
Hi Luis and all,
I am in need of help on connectivity filter. Let me explain my
requirment.
I have a volume of some slices. I have to find the largest object in the
entire volume. Initiallly i will threshold the image so that it will in
binary format. Then i have to use 6-connectivity of find the largest object
in the volume. The largest object should be labeled 1. Is there any filter
which solves my problem. I should use 6-connectivity. Please do suggest me
if there are other alternatives too.
Please help me in this regard.
Thanks in advance.
-Regards,
Sateesh.
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<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff size=2>In
Code/BasicFilters there are two classes ConnectedComponentImageFilter and
</FONT></SPAN></DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2>HardConnectedComponentImageFilter. The former is a rewrite of the
latter to use more of the ITK infrastructure. The latter may be removed
soon. </FONT></SPAN></DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff size=2>The
ConnectedComponentImageFilter will use 6-connectivity in a volume to label the
objects in the volume. Each connected object will have a unique
label.</FONT></SPAN></DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2>However, this does not extract the largest connected object. You
would need a separate filter (that does not exist yet) to scan through the label
map and extract the largest object. As Luis suggested, you could a
histogram of the label map to determine which object is the
"largest".</FONT></SPAN></DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538382917-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> cspl
[mailto:affable at hd2 . dot . net . in]<BR><B>Sent:</B> Friday, June 27, 2003 2:19
AM<BR><B>To:</B> insight-users at itk . org<BR><B>Subject:</B> [Insight-users] Find
largest connected object in a Volume<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Hi Luis and all,<BR> I am in
need of help on connectivity filter. Let me explain my
requirment.<BR> I have a volume of some slices. I have to find the
largest object in the entire volume. Initiallly i will threshold the image so
that it will in binary format. Then i have to use 6-connectivity of find the
largest object in the volume. The largest object should be labeled 1. Is there
any filter which solves my problem. I should use 6-connectivity. Please
do suggest me if there are other
alternatives too.<BR> <BR> Please help me in
this regard.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> Thanks in advance.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>-Regards,<BR>
Sateesh.</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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