Venus cloud tracking -- April 10, 2006

Fig 1

A stand-alone program that performs the ordinal correlation calculation as described in Evans and Bhat.

Fig 2

A comparison of the ranked correlation (L) and ordinal correlation (R) surfaces and candidate vectors for a single flow element. Note that the ordinal calculation appears to miss some peak values, and produces duplicate correlation values.

Fig 3

Relaxing the peak constraint (from '>' to '>=') finds all the peaks and their neighboring values, and also increases the number of candidate vectors.

Fig 4

An ordinal correlation (B) comparison to fig 8, 3/24/06 (T), showing flows for 2 different geometries.

Fig 5

An ordinal correlation (B) comparison to fig 9, 3/24/06 (T), showing flows at 3 different y-axis densities.

Fig 6

Ordinal correlation calculation for image shifted by dx/2 (3:2 range geometry), dx/2+1, and dx/2+1 (3:3 range geometry).

Fig 7

2d parameter space of flow vectors for different domain sizes and range aspect ratios (tiled ranges). QT movie: you may want to download this and view in stand-alone player.

Fig 8

2d parameter space of flow vectors for different domain sizes and range aspect ratios (tiled domains). QT movie: you may want to download this and view in stand-alone player.

Fig 9

Hierarchical flow elements for 6 levels, 4 children each, domains only (L), with ranges (R).

Fig 10

Hierarchical flow elements for 6 levels, 1 child each, domains and ranges, identity flow (L), actual flow (R). Un-preshifted computation.