[Insight-users] documentation

[Karthik Krishnan]

Andinet just beefed up the documentation of the filter. It will appear 
on the doxygen pages tomorrow.

  * This class is parameterized over input image type, contour defined 
by a polyline,
  * and output image type. If the input image is three dimensional, the 
masking operation is
  * performed on each slice (2D image). The output image will have two 
regions demarcated
  * by the contour i.e inside(masked) and outside region.  The pixels in the
  * masked region will keep their original intensity values. Whereas, 
intensity
  * value of pixels outside the masked region will be set to zero.

HTH
Karthik

Zhiyong Xie wrote:

> I thought the document of some classes is too simple to give user a 
> clear idea of these classes. It is one reason we miss something which 
> are already implemented. For example, from the document, I have no 
> idea about PolylineMask2DImageFilter for what kind of input it expect 
> and what kind of output we will receive. It will be sad that the 
> contributor spend lot of time to develop a class, but people 
> ignore it only because of insufficient information. So for the 
> contributors, please do not forget to take a little more time to give 
> more detail of stuff you implemented. Your work is greatly appreciated.
>  
> Sean   
>
>
> */Zachary Pincus <zpincus at stanford.edu>/* wrote:
>
>     > 1) The Bresenham line iterator is already in ITK.
>     > It was contributed by Benjamin King o! n June 2005
>     >
>     > http://www.itk.org/Insight/Doxygen/html/
>     > classitk_1_1LineConstIterator.html
>     >
>     http://www.itk.org/Insight/Doxygen/html/classitk_1_1LineIterator.html
>
>     Hmm, now that I think of it, what's needed here is something more
>     like the PathIterator (since Paths can use continuous indices, but
>     the LineIterator only takes normal itk::Index points for the line
>     ends).
>
>     Fortunately, it seems that a PathIterator is available.
>
>     > 2) This iterator is used by the PolylineMask2DImageFilter
>     > in order to rasterize Polylines into 2D binary mask images.
>     >
>     > http://www.itk.org/Insight/Doxygen/html/
>     > classitk_1_1PolylineMask2DImageFilter.html
>
>     Great -- I don't know how I missed this.
>
>     > 4) What we seem to be missing from your list of desired
>     > functionalities is a filter for taking a 2D image mask and
>     > extracting the contours in the form of a PolyLineParametricPath.
>     >
>     > H! owever, such filter can easily be written by modifying the
>     > SimpleContourExtractorImageFilter
>     >
>     > http://www.itk.org/Insight/Doxygen/html/
>     > classitk_1_1SimpleContourExtractorImageFilter.html
>
>     I'm not fully convinced this will be easy - the tricky part would be
>     reconstructing properly-connected poly-line(s) from the individual
>     segments generated from a modified contour extractor filter. (Such
>     modifications, I think, would basically make it into a "marching
>     squares"
>     filter -- which really isn't hard to implement.) But I suspect there
>     will be a not-too-hard way to connect the points properly.
>
>     How is point-connection done in the (harder) case of marching cubes?
>     Just keeping a list of all the "open" edge points in a mesh to
>     connect to?
>
>     One other issue is that PolyLines can't capture planar objects with
>     'holes' -- you would get extract two PolyLines from a 'donut' shape.
>     This really isn't an issue for m! e since my shapes don't have holes,
>     but if I were to make a general contours-to-geometry filter for ITK
>     (which I would like to do, if I'm making one for myself!) would this
>     issue need to be addressed?
>
>     Zach
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