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Figure compares the convergence of the filtering, subtraction
and ``simplest'' methods. The subtraction scheme converges significantly better
than the two other schemes.
Figure displays the three velocity panels corresponding to each approach
(30 iterations). The two proposed methods increase the resolution of the velocity space compared
to the ``simplest'' scheme.
The table below intends to summarize some practical issues for each strategy when coherent
noise is present in the input data:


PEF 
Regularization 

Stability 
Methods 
Convergence 
estimation 
needed ? 
Residual 
(iterations) 
Filtering 
Slow 
Easy 
Not all the time 
IID 
Stable 
Subtraction 
Fast 
Difficult 
Yes 
IID 
Stable 
Simplest 
Slow 
NA 
Not all the time 
not IID 
Unstable 
The ``PEF estimation'' columns relates to the difficulty of estimating the residual PEF in
Equation 11 and the coherent noise PEF in Equation 15.
Next: Discussion
Up: Results
Previous: Subtraction method
Stanford Exploration Project
9/5/2000