[Insight-users] Contour generation based on binary images

[wydesenej]

Hi. 

I have very specific image to describe structures in other image. 
Scalar value of each pixel consits of N-bits. 
Each bit represents some structure in image. 

Some examples: 
Pixel value = 11010000 -> means that this pixel is in stuctures 1, 2 and 4 
Pixel value = 01010000 -> means that this pixel is in stuctures 2 and 4 
Pixel value = 00001000 -> means that this pixel is in stucture 5 
Pixel value = 00000000 -> means that this pixel is not in any structure 
etc.. 

Now I need to find contours of these structures. 
I need to use some contour filter. Problem is that filters uses as input
scalar value for contour but i want to set "mask value". 

Example what i need: 

someFilter filter; 
filter->SetInput( mySpecialBinaryImage ); 
filter->SetValueMask( 00100000 );    -> This function is not presented in
filter. I want that this means: contour for me structure num3 ie. contour
pixels with bit3 == 1. 
filter->Update(); 
filter->GetOutput(); -> There i get my countour. (if image is 2d i got
polygon if 3d i got surface...) 

Please any ideas how to do this stuff? 




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