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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Here we summarize 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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The reason behind this page is trying to coordinate the various projects regarding this subject.
  
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= Reference =
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= References =
  
 
* [[Developer_Meetings/20150609]]
 
* [[Developer_Meetings/20150609]]
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* [https://github.com/Kitware/VTK/blob/52d45496877b00852a08a5b9819d109c2fd9bfab/Imaging/General/vtkImageGaussianSmooth.h VTK/Imaging/General/vtkImageGaussianSmooth.h]
 
* [https://github.com/Kitware/VTK/blob/52d45496877b00852a08a5b9819d109c2fd9bfab/Imaging/General/vtkImageGaussianSmooth.h VTK/Imaging/General/vtkImageGaussianSmooth.h]
  
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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.
  
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In order to boost filtering, OpenGL solution seems the best that fits our needs:
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In order to implement efficient 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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* 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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=== Use Case ===
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based on the Steve Pieper implementation of the classes:
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Based on the Steve Pieper implementation of the classes:
  
 
<pre>
 
<pre>
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</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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=== 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>
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** 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.

Revision as of 19:32, 9 June 2016

Home < Documentation < Labs < OpenGLFilters

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.

References

Meetings

9th June 2016

Attended by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin.

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.

Use Case

Based on the Steve Pieper implementation of the classes: 

vtkOpenGLTextureImage
vtkOpenGLShaderComputation

here an Use case: 

https://github.com/Punzo/SlicerAstro/tree/master/Smoothing/Logic
https://www.overleaf.com/read/jbxxsqtctpgv

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).

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.
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