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<DIV><FONT face=Arial size=2>Hi there,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Can anyone tell me if this metric value goes down,
does it indicate worse result? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Grace</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Grace.Chen@swri.ca href="mailto:Grace.Chen@swri.ca">Grace Chen</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=insight-users@itk.org
href="mailto:insight-users@itk.org">insight-users@itk.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, June 21, 2006 11:59
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B>
itkNormalizedMutualInformationHistogramImageToImageMetric</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hi there,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I tried looking for examples on how to set
this metric up properly, however, none seem to work well.... The way I am
setting this metric is shown below. However, it gives rediculously bad
result. And it's super slow. To register two volume, what it used to
take (when I use </FONT><FONT face=Arial color=#000000
size=2>itkMattesMutualInformationImageToImageMetric) was 30 sec and now it's
taking 10 mins or more....</FONT></DIV>
<DIV><FONT face=Arial size=2>And also, the metric value starts from 1.2 to
1.006. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Does anyone know what's going on? Or does
anyone know how to set this metric up proerply??</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Grace</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>------------------------------------------------------------------------------------</FONT></DIV>
<DIV>
<P><FONT color=#0000ff>unsigned</FONT> <FONT color=#0000ff>int</FONT> nBins =
32;</P>
<P>MetricType::HistogramType::SizeType histSize;</P>
<P>histSize[0] = nBins;</P>
<P>histSize[1] = nBins;</P>
<P>metric->SetHistogramSize(histSize);</P>
<P></P>
<P><FONT color=#008000>// Plug the images into the metric.</P></FONT>
<P>metric->SetFixedImage(fixedImage);</P>
<P>metric->SetMovingImage(movingImage);</P>
<P><FONT color=#0000ff>const</FONT> <FONT color=#0000ff>unsigned</FONT> <FONT
color=#0000ff>int</FONT> numberOfParameters =
transform->GetNumberOfParameters();</P>
<P><FONT color=#0000ff>typedef</FONT> MetricType::ScalesType ScalesType;</P>
<P>ScalesType scales( numberOfParameters );</P>
<P>scales.Fill( 1.0 );</P>
<P>metric->SetDerivativeStepLengthScales(scales); </P>
<P><FONT face=Arial
size=2>-------------------------------------------------------------------------------------</FONT></P></DIV></BLOCKQUOTE></BODY></HTML>