Comparison study

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.