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Parameters of Point Set Motion Generator
The Point Set Motion Generator (PSMG) has the following parameters:
- number of frames
- This is the length of an image sequence. It is
an integer between 1 and 20.
- number of points
- This is the total number of trajectories during
an image sequence. It is an integer between 1 and 100.
The computational load of the algorithms depends
strongly on this parameter. For the algorithms by Sethi and Jain SJ97 and
Salari and Sethi SS90, a value not exceeding 40 is recommended.
- image size
- This is specified by the number of rows and
the number of columns. Both are integers between 50 and 500.
- velocity mean
and variance
- These are positive
real numbers not exceeding 20.0 and 10.0, respectively.
They control the Gaussian-distributed
velocities in the first frame, where the points are generated randomly with
uniformly distributed initial positions and directions of motion.
- variance of change in velocity magnitude
- This variance
controls the Gaussian perturbation of velocity magnitude in the subsequent frames.
It is a real number between 0.0 and 10.0, in pixels.
- variance of change in velocity direction
- This variance
controls the Gaussian perturbation of velocity direction in the subsequent frames.
It is a real number between 0.0 and 90.0, in degrees.
- probability of occlusions
- This specifies how frequently the points disappear
for one frame. It is a real number between 0.0 and 0.3.
The speeds generated are cut at the speed
limit
.
The speed limit
is passed to the tracking algorithms.
Click here to test
the PSMG and the tracking algorithms.
Next: Submitting Your Own Point
Up: Generating Moving Point Sets
Previous: Generating Moving Point Sets
Dmitry Chetverikov
1998-11-24