[vtkusers] Streaming Pipeline

[Kevin H. Hobbs]

Mark Bolstad wrote:
>
> A typical use case is for a user to read in a particular image, drill 
> into a subregion and trace a feature through the layers above and 
> below (typically around 10 images on either side of the target). They 
> then either make some adjustments or edit some meta-data and then move 
> to another subregion on the same layer, or zoom out, switch layers, 
> and repeat the process.
We do something similar by clipping the large image on disk to the 
region of interest. When we want to move around in the large image we 
change the extent of the clip and update the pipeline.

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