Difference between revisions of "Documentation/Labs/OpenGLFilters"

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Here we summurize some efforts for enabling image processing (filtering/smoothing) in VTK/Slicer using OpenGL.
 
  
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The reason behind this page is trying to coordinate the variuos projects regarding this subject.
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= Overview =
  
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= Reference =
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Here we summarize some efforts for enabling image processing (filtering/smoothing) in VTK/Slicer using OpenGL.
  
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<pre>
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The reason behind this page is trying to coordinate the various projects regarding this subject.
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https://www.slicer.org/slicerWiki/index.php/Developer_Meetings/20150609
 
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https://www.slicer.org/slicerWiki/index.php/Developer_Meetings/20150901
 
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https://github.com/pieper/CommonGL/tree/master/GLFilters
 
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http://www.vtk.org/Wiki/Shader_In_VTK
 
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https://github.com/Kitware/VTK/blob/52d45496877b00852a08a5b9819d109c2fd9bfab/Imaging/General/vtkImageGaussianSmooth.h
 
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</pre>
 
  
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= Meeting =
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= Meetings =
  
 
==  9th June 2016 ==
 
==  9th June 2016 ==
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Attanded by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin.
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Attended by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin, Utkarsh Ayachit and Robert Maynard
 +
 
 +
Based on an original idea of Steve Pieper
  
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In order to boost filtering, OpenGL solution seems the best that fits our needs:
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* no requirment on external library (CUDA or OpenCL).  
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In order to implement efficient filtering, OpenGL solution seems the best that fits our needs:
 +
* no requirement on external library (CUDA or OpenCL).  
 
* performance boosting is fairly good to allow almost interactive filtering up to volume of ~10^8 voxels.
 
* performance boosting is fairly good to allow almost interactive filtering up to volume of ~10^8 voxels.
  
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= Use Case =  
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[[File:2016.06.09 SlicerAstro CPU-vs-GPU Filtering.png]]
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based on the Steve Pieper implementation of the classes:
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<br><small>Source: [https://arxiv.org/abs/1609.03782 Finding faint HI structure in and around galaxies: scraping the barrel (Astronomy and Computing accepted)]</small>
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 +
 
 +
 
 +
 
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=== Use Case ===
 +
 
 +
Based on the Steve Pieper implementation of the classes:
  
 
<pre>
 
<pre>
Line 33: Line 37:
  
 
<pre>
 
<pre>
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https://github.com/Punzo/SlicerAstro/tree/master/Smoothing/Logic
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https://github.com/Punzo/SlicerAstro/tree/master/AstroSmoothing/Logic
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https://www.overleaf.com/read/jbxxsqtctpgv
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https://arxiv.org/abs/1609.03782
 
</pre>
 
</pre>
  
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= Full integration in VTK =
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=== Full integration in VTK ===
  
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For a full integration of the openGLfilters pipeline in VTK, it will be ideally to have a general purpose class:
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For a full integration of the openGLfilters pipeline in VTK, it will be ideal to have a general purpose class:
  
 
<pre>
 
<pre>
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this class will have the duty to:
 
this class will have the duty to:
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* hanle the I/O comunication between the vtkImageData and the GPU Texture using fully the VTK shader infrastracure, since the shader infrastructure is already available in VTK (safe binding, automatic versioning, etc... http://www.vtk.org/Wiki/Shader_In_VTK).
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* handle the I/O communication between the <code>vtkImageData</code> and the GPU Texture using fully the VTK shader infrastructure, since the shader infrastructure is already available in VTK (safe binding, automatic versioning, etc... http://www.vtk.org/Wiki/Shader_In_VTK).
 
* child classes will handle different approach (e.g. multipass/iterative filtering).
 
* child classes will handle different approach (e.g. multipass/iterative filtering).
  
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= Action =  
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Ken Martin provided this structure in VTK: [https://gitlab.kitware.com/ken-martin/vtk/commit/c3a6dfa9023d905151ee61eb83f58bef765d0e2e]
 +
 
 +
=== Next steps ===
 
* Talk with Steve and getting his feedback.
 
* Talk with Steve and getting his feedback.
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* Ken will be very happy to contribute writing the base class VTKOpenGLImageAlgorithm (in a couple of weeks after his vacation).
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* Ken will be very happy to contribute a base class <code>vtkOpenGLImageAlgorithm</code>
 +
** Timeline: in 2-3 weeks after his vacation
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** Most likely derived from <code>vtkImageAlgorithm</code>, the class will integrate feature from [https://github.com/Kitware/VTK/blob/master/Rendering/OpenGL/vtkGaussianBlurPass.h VTK/Rendering/OpenGL/vtkGaussianBlurPass.h] to facilitate the use of custom shaders to implement GPU based filters.
 +
 
 +
== Status ==
 +
* Ken wrote the base class for operation filtering on GPU [https://github.com/Kitware/VTK/blob/41fab4e9d7a7b55cd5c7368fee914a74b7bec751/Rendering/OpenGL2/vtkOpenGLImageAlgorithmHelper.h]
 +
* and he gave also an example how to use it: [https://github.com/Kitware/VTK/blob/3530cb6e8a7992ba1c8dbf5652c2b9d0c21bf4cd/Imaging/OpenGL2/vtkOpenGLImageGradient.h]
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* An application of the class for filtering can also be found here: [https://github.com/Punzo/SlicerAstro/tree/master/vtkOpenGLFilters]
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= References =
 +
 
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* [[Developer_Meetings/20150609]]
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* [[Developer_Meetings/20150901]]
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* https://github.com/pieper/CommonGL/tree/master/GLFilters
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* http://www.vtk.org/Wiki/Shader_In_VTK

Latest revision as of 08:42, 14 September 2016

Home < Documentation < Labs < OpenGLFilters

Overview

Here we summarize some efforts for enabling image processing (filtering/smoothing) in VTK/Slicer using OpenGL.

The reason behind this page is trying to coordinate the various projects regarding this subject.

Meetings

9th June 2016

Attended by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin, Utkarsh Ayachit and Robert Maynard

Based on an original idea of Steve Pieper


In order to implement efficient filtering, OpenGL solution seems the best that fits our needs:

  • no requirement on external library (CUDA or OpenCL).
  • performance boosting is fairly good to allow almost interactive filtering up to volume of ~10^8 voxels.

2016.06.09 SlicerAstro CPU-vs-GPU Filtering.png
Source: Finding faint HI structure in and around galaxies: scraping the barrel (Astronomy and Computing accepted)



Use Case

Based on the Steve Pieper implementation of the classes: 

vtkOpenGLTextureImage
vtkOpenGLShaderComputation

here an Use case: 

https://github.com/Punzo/SlicerAstro/tree/master/AstroSmoothing/Logic
https://arxiv.org/abs/1609.03782

Full integration in VTK

For a full integration of the openGLfilters pipeline in VTK, it will be ideal to have a general purpose class: 

VTKOpenGLImageAlgorithm

this class will have the duty to:

  • handle the I/O communication between the vtkImageData and the GPU Texture using fully the VTK shader infrastructure, since the shader infrastructure is already available in VTK (safe binding, automatic versioning, etc... http://www.vtk.org/Wiki/Shader_In_VTK).
  • child classes will handle different approach (e.g. multipass/iterative filtering).

Ken Martin provided this structure in VTK: [1]

Next steps

  • Talk with Steve and getting his feedback.
  • Ken will be very happy to contribute a base class vtkOpenGLImageAlgorithm
    • Timeline: in 2-3 weeks after his vacation
    • Most likely derived from vtkImageAlgorithm, the class will integrate feature from VTK/Rendering/OpenGL/vtkGaussianBlurPass.h to facilitate the use of custom shaders to implement GPU based filters.

Status

  • Ken wrote the base class for operation filtering on GPU [2]
  • and he gave also an example how to use it: [3]
  • An application of the class for filtering can also be found here: [4]

References

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