<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><BR>hi;</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">thanks your reply, I found out a method and I am planing to use it. I found it itksoftwareguide 4.1.3 Accessing pixel data. </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">it is like this:</DIV><FONT face=Courier size=1>
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><FONT size=3><STRONG>ImageType::IndexType pixelIndex;</STRONG></FONT></P>
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><FONT size=3><STRONG>pixelIndex[0] = 27; // x position</STRONG></FONT></P>
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><FONT size=3><STRONG>pixelIndex[1] = 29; // y position</STRONG></FONT></P>
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><FONT size=3><STRONG>pixelIndex[2] = 37; // z position</STRONG></FONT></P></FONT><FONT face="Times New Roman">
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left>
<P align=left><STRONG></STRONG> </P>
<P align=left><STRONG></STRONG></FONT><FONT face="Times New Roman"> </P></FONT><FONT face=Courier><STRONG>ImageType::PixelType pixelValue = image->GetPixel( pixelIndex );</STRONG></P></FONT><FONT face="Times New Roman">
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><STRONG>The </STRONG></FONT><STRONG><FONT face=Courier>SetPixel() </FONT><FONT face="Times New Roman">method allows us to set the value of the pixel.</P></FONT></STRONG><FONT face=Courier>
<P style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif" align=left><STRONG>image->SetPixel( pixelIndex, pixelValue+1 );</STRONG></P>
<P></FONT> </P>
<P> </P>
<P>thanks a lot</P>
<P>Tony</P>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><BR></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: Michael Knopke <Michael.Knopke@gmx.de><BR>To: vtkusers@vtk.org<BR>Sent: Tuesday, March 6, 2007 2:43:56 PM<BR>Subject: [vtkusers] 3D .raw data density values<BR><BR>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi Tony,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I’m not sure if this is alright, so use with care </SPAN></FONT><FONT face=Wingdings size=2><SPAN lang=DE style="FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">J</SPAN></FONT><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">If your dataset is vtkImageData (I guess so) then you can use:</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">vtkImageData->FindPoint(double x[3]); //where x is in worldspace coordinates</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">But this will only find the closest point belonging to your original dataset. So if you select a point in worldspace that has no direct association to a point in imagedata, the value is not correct.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Data in between needs to be interpolated. A way to get the interpolated point at a certain position is to use the vtkProbeFilter with your imagedata. But the output depends on what interpolation type you choose (linear/cubic..).</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Please correct me If I’m wrong.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Regards</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Michael</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P></DIV>
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