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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">Hi Alex,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">Thank you for recommendations.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">I need to update images continuously. I wanted to check whether there is any solution using VTK or not.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">I will use CUDA or OpenGL to solve my issue. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">Thank you for your help.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO">Alan<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:KO"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Alejandro Rodríguez Aguilera [mailto:alejandro88_@hotmail.com]
<br>
<b>Sent:</b> Friday, February 20, 2015 11:12 AM<br>
<b>To:</b> Kang, Sukryool; vtkusers@vtk.org<br>
<b>Subject:</b> RE: [vtkusers] Linear Interpolation on 3D image data<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri","sans-serif"">Hello,<br>
<br>
If I understood well, and you don't need XY interpolation, would it not be enough to get the images bounding the current sampling point (aka, the "previous" and "next" images, determined by their Z coordinate and the Z coordinate of the current sampling point
in the structure 3D image), sample both images for the XY coordinates of the sampling point, and then doing the 1D linear interpolation, using the three Z coordinates?<br>
<br>
This may take some time as you mention but, since it seems a preprocess step, only needed once before starting to visualize, I don't see the problem.
<br>
<br>
If this is not the case and you need to perform this step several times, my guess is that you should consider using the GPU to construct the 3D image data (using CUDA, OpenCL or OpenGL compute shaders, for example) and feed it to VTK, since the amount of data
you are handling is big enough and the algorithm is parallelizable enough.<br>
<br>
Best regards,<br>
Alex<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri","sans-serif"">From: SKang@childrensnational.org<br>
To: vtkusers@vtk.org<br>
Date: Fri, 20 Feb 2015 15:50:44 +0000<br>
Subject: [vtkusers] Linear Interpolation on 3D image data<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Hi everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">I am trying to do linear interpolation on 3D image data.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">I have used mechanically scanned ultrasound images to construct 3D volume. Ultrasound probe is mounted on the linear stage. I am getting exact positions along the stage movement direction
(Z axis). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">The 2D images are aligned along X and Y axes. I have saved stack of 2D images as vtkimagedata without the stage location information (Z values).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">The problem is that the 2D ultrasound images are not even distributed along Z axis. I want to do linear interpolation along the Z axis to construct structured 3D image data.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Actually, I need to do 1 dimensional linear interpolation along the Z axis. I don’t need to do any interpolation along X and Y axes.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">I can do the 1D linear interpolation along the Z axis. The image resolution is about 800 x 780 x 250.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">If I do the linear interpolation of 800x780 pixels along the Z axis, it takes some time. I am doing a real time visualization.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Is there any way to do linear interpolation fast using VTK?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Thank you for your help.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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