Keywords: jitter, motion
Summary
This demo focuses on the temporally uncorrelated jitter tools available in the DIRSIG model. Specifically, the ability to supply the mean and standard deviation to any of the three dimensions of the platform location and/or orientation.
Details
The jitter in this scenario is associated with the X, Y and Z location of the platform. The DIRSIG platform model supports jitter for all six degrees of freedom (the XYZ location and XYZ orientation) for the platform and each mount supports jitter in three degrees of freedom (the XYZ orientation).
Important Files
-
The generic platform motion file (
jitter.ppd) features the uncorrelated jitter model assigned to the X, Y and Z dimensions of the platform location.
Setup
This simulation consists of a 2D framing camera mounted to a platform that is statically positioned (a single location and orientation entry) over the scene. The jitter causes the platform and hence the attached 2D framing camera to move between each capture.
The key component in this simulation is the jitter.platform file.
The jitter for the X, Y and Z location was setup using the following
steps:
-
Open the Platform Motion Editor
-
Click on the Jitter tab
-
Change the jitter model for the X Axis in the Location from None to Temporally Uncorrelated.
-
Click the Edit button
-
In the popup window, the mean and standard deviation can be set.
-
The standard deviation was set to
0.1radians in this example compared to the pixel IFOV of0.0015radians.
-
-
This process was repeated for the Y Axis and Z Axis of the Location.
Results
The simulation produces 24 image frames that spans the 1 second task window. Because of the platform jitter, each frame is offset from the previous and the target scene appears to dance around.
