Local Velocity Estimate with Formula if too few Particles
Local Velocity Estimate with Formula if too few Particles
This option represents a cross between [L Local velocity estimate] and [F
Formula for velocity]. If there are sufficient particles with valid
matches for a local velocity estimate to be used, then it will be,
otherwise this option allows the user to specify a formula to give the
predicted velocity for new particle paths. The formula may be given in
terms of space (world coordinates X,Y or pixel coordinates I,J) and time
(T).
Formula for x component of velocity (world units per second; express as
function of X,Y and T) ?
Specify the formula giving the predicted velocity for new particle paths.
This may be a function of both time and space. For the spatial structure,
either world coordinates (X,Y) or pixel coordinates (I,J) may be used. The
normal DigImage syntax rules apply for this expression.
Formula for y component of velocity (world units per second; express as
function of X,Y and T) ?
As for the x component above.
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DigImage User Documentation
Stuart Dalziel,
last page update: 19 February 1996