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Figure 48 2D 3x3 Filtering Concepts
For all the parameters except velocity, the interpolated value for filling is
computed as the arithmetic mean of all available neighbors. The procedure
for velocity is similar, except that the 8-bit angles are first converted to
Cartesian vectors, then averaged and converted back to polar.
The 2D 3x3 speckle filter can be used with or without the 1D speckle
filtering, however; the data is cleaner if both filters are applied.
The 2D 3x3 speckle filter has some interesting properties when combined
with other algorithms.
6.4.3.2.1 Dual-PRF Unfolding
Dual-PRF velocity unfolding is computed within the 3x3 filter whenever
both are enabled. There are two steps to the process:
1. The most recent and the previous ray are used. For every valid point
in the most recent ray, the algorithm performs a search among the
three nearest neighbors in the previous ray to find a valid velocity. The
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