[Insight-users] Confidence Connected Seed Coordinates

[Cameron Burnett]

Hi,

I'm just wondering about the coordinate system of the confidence connected algorithm. I'm using a vtkPointWidget to select a seed point, and according to the point widget, my XY coordinates range from about -45,413 (top-left) to 413,-45 (bottom-right).... and also a z coordinate which I've got as 7.5 (middle slice).

Now, when I plug that into the confidence connected SetSeed() method, I don't think the two coordinate systems are matching up because my results are a bit strange. 


The following picture is an image of two legs, and you can see the vtkPointWidget being positioned in the center of the femur.

http://img382.imageshack.us/img382/2118/dicomimgaw7.jpg

This is the result of a multiplier of 0.1, followed by a multiplier of 2.

http://img397.imageshack.us/img397/9743/outputvtk01multiplierwd7.jpg
http://img383.imageshack.us/img383/6727/outputvtk2multiplierfs6.jpg

(Note: I think these may be a bit pixely due to the compression on imageshack, but the actual ones are just 2 solid colours)


What I conclude from that is that the blue area is in fact the area that has been seeded, not the red area. Therefore that is why I believe that I have some sort of problem with the coordinates not matching. What do I have to do to make sure the point widget and the SetSeed() method both match up??

And I also don't know why there are 2 colours in the vtk file, when one should obviously be transparent. Is that one easy to answer?


Thanks for any help,
Cameron.



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