Barbara T. Sweet

Barbara Sweet, an aerospace engineer at the NASA Ames Research Center, told attendees at the IMAGE 2007 conference in Scottsdale, Ariz., in July that motion-induced blur "is a highly salient and potentially objectionable issue."And in NASA Ames tests using an LCoS helmet-mounted display, even the lowest levels of perceived blur were above that experienced with CRT and would "likely produce very salient and objectionable differences in perceived resolution as a function of image motion," she said."Other technologies offer advantages beyond CRT projectors that make them attractive," Sweet concluded.
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With LCoS, the eye moves past the pixel and produces blur on the retina," Sweet said.
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It appears that shuttering is a worthwhile strategy," Sweet said.Agreeing to a standard for measuring and comparing different technologies and displays is also important, Sweet said."A common measurement standard must be developed to allow side-by-side comparisons of the different models and technologies of today, and to allow more cogent discussions on projector performance," Sweet's paper concludes."For these standards to be usable to inform design decisions, a clear correlation needs to be established between the sensor-based measurement metrics and human perception, across varying levels of contrast, luminance and resolution."FRAME RATE INCREASEMore controversially, Sweet proposed doubling the current typical frame refresh rates from 60 Hertz to 120 Hertz - 120 cycles per second.

Barbara Sweet, an aerospace engineer at the NASA Ames Research Center, told attendees at the IMAGE 2007 conference in Scottsdale, Ariz., in July that motion-induced blur "is a highly salient and potentially objectionable issue."And in NASA Ames tests using an LCoS helmet-mounted display, even the lowest levels of perceived blur were above that experienced with CRT and would "likely produce very salient and objectionable differences in perceived resolution as a function of image motion," she said.

"Other technologies offer advantages beyond CRT projectors that make them attractive," Sweet concluded.
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It appears that shuttering is a worthwhile strategy," Sweet said.

Agreeing to a standard for measuring and comparing different technologies and displays is also important, Sweet said.

"A common measurement standard must be developed to allow side-by-side comparisons of the different models and technologies of today, and to allow more cogent discussions on projector performance," Sweet's paper concludes."For these standards to be usable to inform design decisions, a clear correlation needs to be established between the sensor-based measurement metrics and human perception, across varying levels of contrast, luminance and resolution."

More controversially, Sweet proposed doubling the current typical frame refresh rates from 60 Hertz to 120 Hertz - 120 cycles per second.

The U.S. Air Force Office of the Surgeon General asked NASA two years ago to do a feasibility study ,the Operational Based Vision Assessment (OBVA) program ,to see if it was possible with current technology to create a flight simulator with an eye-limiting resolution out-the-window (OTW) visual system ,or one that could replicate what a pilot would see when flying such that his operational vision could be evaluated ,says Barbara Sweet, aerospace engineer for the Human Systems Integration division at NASA Ames.
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This would be too expensive to maintain let alone operate, Sweet says.

NASA Ames recommends a system that has the ability to sustain a constant, high update rate (60 Hz or greater) without missing refresh cycles or producing objectionable artifacts, Quantum3D officials say.

Sweet and her team looked at ways to collect find, fix, target, track, and engage (F2T2E) data in simulation environments and how that can be used to create standards for operational vision evaluation. The goal is to create a system "good enough to show the relationship between pilot vision and operational performance," Sweet says. To accomplish that, the system needed to overcome the hurdle of preventing motion-induced blur in the projection systems, she continues.

Effects of Temporal Aliasing on Out-the-Window Viisual Systems - Barbara T. Sweet, NASA

Effects of Temporal Aliasing on Out-the-Window Viisual Systems - Barbara T. Sweet, NASA

Barbara T. SweetHuman-Systems Integration Division, NASA Ames Research Center, Moffett Field, CA, USA
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Citation Li, L., Sweet, B. T., & Stone, L. S. (2006).

Barbara T. SweetNASA Ames Research Center, Moffett Field, California