[Insight-users] how can I make modification to a filter already exists in ITK?

[Guorong Wu]

hello everyone:
      I am planing to make some improvent to demons algorithms[Thirion 98](Registration/DeformableRegistration2.cxx). Demons algorithm may cause non-uniform deformation field which will oversmooth at the rigion of lower contrast. My modification includes: 1. control the force field smoothing according to gradients by add a weight at each iteration; 2. prevent oversmoothing the deformation field at lower contrast region with statistical model at each iteration.
      So I want write a new filter named ModifiedDemonsRegistrationFilter. I refer to charpter 13 in ITKSoftwareGuide but not quite clear about how to do. Since I only want to make some modification of force field and deformation field which could be computered with original DemonsRegistrationFilter at each iteration, Should I override PDEDeformableRegistrationFilter and DemonsRegistrationFunction and make modification there? And another question, Assuming I have writen the filter, for example, ModifiedDemonsRegistrationFilter.cxx, Should I rebuild ITK to make it work or simply put it at my personal directory? Thanks. Hoping for your reply. 
        		

　　　　　　　　Guorong Wu
　　　　　　　　grwu at sjtu.edu.cn
　　　　　　　　　　2004-07-01

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Guorong Wu	
The Department of Computer Science and Technology
Shanghai Jiao Tong University
1954 Huashan RD
Shanghai China    
200030
Tel:  +86 21 3226 1236  , 6293 2089
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