[Insight-users] Multitreading in ITK classes

[Bradley Lowekamp]

Hello, 

If you want to implement a single threaded ImageFilter you over-ride the GenerateData() method, if you want to implement a multi-threaded filter you over-ride the ThreadedGenerateData() method and optionally the  BeforeThreadedGenerateData,() or the AfterThreadedGenerateData() methods. The ImageSource class over-rides the GenerateData() method to split the image and multi-thread the processing:

https://github.com/Kitware/ITK/blob/master/Modules/Core/Common/include/itkImageSource.hxx#L251

For multi-threaded filters this ThreadedGenerateData() methods should produce the output region that is passed as a parameter, which the single threaded GenerateData() method should produce the output image(s)' requested regions.

The general guideline is to file an image filter which does a similar operation and use it as a model for implementing your own filter.

Brad

On Oct 10, 2012, at 6:09 AM, Dženan Zukić <dzenanz at gmail.com> wrote:

> Take a look at these simple examples:
> http://www.itk.org/Wiki/ITK/Examples/Developer/MultiThreadedImageFilter
> http://www.itk.org/Wiki/ITK/Examples/Developer/OilPaintingImageFilter
> 
> 
> On Wed, Oct 10, 2012 at 7:40 AM, Ashwath Hegde, ERS-HCLTech <Ashwathh at hcl.com> wrote:
> Hi All,
> 
>  
> 
> I am new to ITK.I have written some image processing algorithms like binarization,contrast enchancement etc  in C.
> 
> I want to apply threading concept on the algorithms which I have written in C so that they execute faster.
> 
> So I wanted to know how multithreading is applied on various filters in ITK,so that I can apply the same concept on my C algorithms.
> 
> I debugged the example “FlipImageFilter.cxx” to see if it was multithreaded but could find out much.
> 
>  
> 
> Kindly help me in this.
> 
>  
> 
> Regards,
> 
> Ashwath
> 
>  
> 
>  
> 
> 
> 
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