No subject

by A->SetInput( B->GetOutput() ) calls, and the invoke "Update()"
in the last filter of the pipeline.


Please let us know if you have further questions,

  Thanks

   Luis


=================================

zhao wrote:
> Hi Luis,
> 
> 	By reading the source code of WaterShedSegmentation example, I got a taste of the pipeline architecture used in ITK. In this example, there are three filters (except for image read and write filters): Anisotropic Diffusion Filter, Gradient Magnitude Filter, and Watershed Segmentation Filter. I know the output of one filter is the input of it's subsequent filter, and thus a processing pipeline is constructed. It seems that it's the Write() member function of ImageFileWriter object that triggers the whole processing procedure. Now, I got two question to ask:
> 	
> 	(1) How does the later Filter trigger the former Filter's execution? ( e.g. Watershed trigers Gradient, and Gradient triggers Diffusion ).
> 	(2) How does a Process Object (i.e. a filter) begin it's own processing? (e.g. I think the processing subroutine of GradientMagnitudeImageFilter should be ThreadedGenerateData, but I can't find explicitly where GradientMagnitudeImageFilter evoke it. )
> 
> 	Maybe it's too complex to give a clear explanation. Any reply will be appreciated. Thanks in advance!!
> 
> Zhao
>     
> 
> Zhao ChenGuang
> P.O.Box:010,
> Dept. BME
> Shanghai Jiao Tong University,
> 1954# Hua Shan Road,
> Shanghai,P.R.China,
> 200030
> 
> 
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