Difference between revisions of "Documentation/Labs/OpenGLFilters"
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== 9th June 2016 == | == 9th June 2016 == | ||
Attended by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin, Utkarsh Ayachit and Robert Maynard | Attended by: Davide Punzo, Jean-Christophe Fillion-Robin, Ken Martin, Utkarsh Ayachit and Robert Maynard | ||
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| + | Based on an original idea of Steve Pieper | ||
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* no requirement on external library (CUDA or OpenCL). | * 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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| + | [[File:2016.06.09 SlicerAstro CPU-vs-GPU Filtering.png]] | ||
| + | <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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<pre> | <pre> | ||
| − | https://github.com/Punzo/SlicerAstro/tree/master/ | + | https://github.com/Punzo/SlicerAstro/tree/master/AstroSmoothing/Logic |
| − | https:// | + | https://arxiv.org/abs/1609.03782 |
</pre> | </pre> | ||
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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). | * 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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| + | Ken Martin provided this structure in VTK: [https://gitlab.kitware.com/ken-martin/vtk/commit/c3a6dfa9023d905151ee61eb83f58bef765d0e2e] | ||
=== Next steps === | === Next steps === | ||
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** Timeline: in 2-3 weeks after his vacation | ** Timeline: in 2-3 weeks after his vacation | ||
** 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. | ** 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] | ||
| + | * An application of the class for filtering can also be found here: [https://github.com/Punzo/SlicerAstro/tree/master/vtkOpenGLFilters] | ||
= References = | = References = | ||
Latest revision as of 08:42, 14 September 2016
Home < Documentation < Labs < OpenGLFiltersContents
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.
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
vtkImageDataand 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]
