EFFECTS OF SPATIO-TEMPORAL ALIASING ON OUT-THE-WINDOW VISUAL SYSTEMS

Barbara T. Sweet, Ph.D. Aerospace Engineer & Leland S. Stone, Ph.D. Research Psychologist NASA Ames Research Center Dorion B. Liston, Ph.D. Research Associate San Jose State University Tim M. Hebert, Ph.D. Software Engineer VDC Display Systems Abstract Designers of out-the-window visual systems face a challenge when attempting to simulate the outside world as viewed from a cockpit. Many methodologies have been developed and adopted to aid in the depiction of particular scene features, or levels of static image detail. However, because aircraft move, it is necessary to also consider the quality of the motion in the simulated visual scene. When motion is introduced in the simulated visual scene, perceptual artifacts can become apparent. A particular artifact related to image motion, spatio-temporal aliasing, will be addressed. The causes of spatio-temporal aliasing will be discussed, and current knowledge regarding the impact of these artifacts on both motion perception and simulator task performance will be reviewed. Methods of reducing the impact of this artifact are also addressed.

[1]  Yoshihiko Kuroki,et al.  3.4: Improvement of Motion Image Quality by High Frame Rate , 2006 .

[2]  John H. R. Maunsell,et al.  Visual processing in monkey extrastriate cortex. , 1987, Annual review of neuroscience.

[4]  L. Li,et al.  Active Control With an Isoluminant Display , 2006, IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans.

[5]  George A. Geri,et al.  59.5L: Late-News Paper: Evaluation of a Prototype Grating-Light-Valve Laser Projector for Flight Simulation Applications , 2008 .

[6]  L. Stone,et al.  Effect of contrast on the active control of a moving line. , 2005, Journal of neurophysiology.

[7]  J Lorenceau,et al.  Visual Motion Integration for Perception and Pursuit , 2000, Perception.

[8]  J. Schroeder,et al.  AIAA 2001-4251 Effects of Visual Texture, Grids, and Platform Motion on Unpowered Helicopter Landings , 2001 .

[9]  Leland S. Stone,et al.  Expansion of Direction Space around the Cardinal Axes Revealed by Smooth Pursuit Eye Movements , 2005, Neuron.

[10]  R. Krauzlis,et al.  Shared motion signals for human perceptual decisions and oculomotor actions. , 2003, Journal of vision.

[11]  Andrew B. Watson,et al.  Window of visibility: a psychophysical theory of fidelity in time-sampled visual motion displays , 1986 .

[12]  Eileen Kowler,et al.  Sensitivity of smooth eye movement to small differences in target velocity , 1987, Vision Research.

[13]  S. Lisberger,et al.  Properties of visual inputs that initiate horizontal smooth pursuit eye movements in monkeys , 1985, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[14]  Brent R. Beutter,et al.  Human motion perception and smooth eye movements slow similar directional biases for elongated apertures , 1998, Vision Research.

[15]  Julie Mapes Lindholm,et al.  Next-Generation Flight Simulators: Image-Update-Rate Considerations , 2003 .

[16]  L S Stone,et al.  Motion coherence affects human perception and pursuit similarly , 2000, Visual Neuroscience.