[Insight-users] Demons Algorithm

[luzhentai]

Hi guys,I try to elastically register images with Demons Algorithm, I found the equation 8.38:? for( j = 0; j < ImageDimension; j++ )??? { // the displacement or optical flow between the images??? update[j] = speedValue * gradient[j] / denominator;? // P452 equation :8.38??? if ( globalData )? ?{ ?globalData->m_SumOfSquaredChange += vnl_math_sqr( update[j] );?? }??? } in itkDemonsRegistrationFunction.txx  ( ::ComputeUpdate() )what's the meaning of:globalData->m_SumOfSquaredChange += vnl_math_sqr( update[j] );and where is the iteration equation 8.39?  Is it in the itkDenseFiniteDifferenceImageFilter.txx ?Thank you very much.Best Regards?
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