<div dir="ltr"><br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Kannan U V</b> <span dir="ltr"><<a href="mailto:kannanuv@cshl.edu">kannanuv@cshl.edu</a>></span><br>
Date: Tue, Nov 5, 2013 at 2:18 PM<br>Subject: Read Particular pixel value<br>To: <a href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br><br><br><div dir="ltr"><div>Hi,</div><div>I am trying to find the value of a label at particular point in the image. The pickedPoint gives me the x,y,z co-ordinate where I should pick the value. How do I find the image value at that voxel? Since it is a label image I want to use nearest neighbor interpolation. Can anyone give me pointers of how to get the label value?</div>

<div><br></div><div><br></div>  vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::SafeDownCast(obj);<br><br>  iren->SetPicker(picker);<br><br>  // get event position<br>  int event_pos[2];<br>  iren->GetEventPosition(event_pos);<br>


<br>  // update label<br>  QString str;<br><br>iren->GetPicker()->Pick(iren->GetEventPosition()[0], iren->GetEventPosition()[1], 0,  iren->GetRenderWindow()->GetRenderers()->GetFirstRenderer());<br>
  double pickedPoint[3];<br>  iren->GetPicker()->GetPickPosition(pickedPoint);<br>
<br>  vtkSmartPointer<vtkImageCast> imageCast = vtkSmartPointer<vtkImageCast>::New();<br>  vtkSmartPointer<vtkImageData> atlasLabelImageData = vtkSmartPointer<vtkImageData>::New();<br><br>
  imageCast->SetInput(atlasLabelsReader->GetOutput());<br>  imageCast->SetOutputScalarTypeToUnsignedShort();<br>  imageCast->Update();<br>  atlasLabelImageData = imageCast->GetOutput();<br>  unsigned long labelCellID = (unsigned short) atlasLabelImageData->FindPoint(pickedPoint);<br>

<br>  str.sprintf("(x, y, z) = (%3.2f, %3.2f, %3.2f), Label Value = %f", pickedPoint[0], pickedPoint[1], pickedPoint[2], labelCellID);<span class="HOEnZb"><font color="#888888"><br clear="all">
<div><br></div>-- <br>Thanks,<br>Kannan
</font></span></div>
</div><br><br clear="all"><div><br></div>-- <br>Thanks,<br>Kannan
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