| The Influence of Depth of Focus on Visibility of Monocular Head-Mounted Display Symbology in Simulation and Training Applications |
FEB 2007 |
12 pages |
| Authors:
Marc D. Winterbottom; Robert Patterson; Byron J. Pierce; Christine Covas; Jennifer Winner; LINK SIMULATION AND TRAINING MESA AZ
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 | The Joint Helmet Mounted Cueing System (JHMCS) is being considered for integration into the F-15, F-16, and F-18 aircraft. If this integration occurs, similar monocular head-mounted displays (HMDs) will need to be integrated with existing out-the-window simulator systems for training purposes. One such system is the Mobile Modular Display for Advanced Research and Training (M2DART), which is constructed with flat-panel rear-projection screens around a nominal eye-point. Because the panels are ... |
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| Depth of Focus and Perceived Blurring of Simultaneously-Viewed Displays |
FEB 2007 |
12 pages |
| Authors:
Marc D. Winterbottom; Robert Patterson; Byron J. Pierce; Christine Covas; Jennifer Winner; LINK SIMULATION AND TRAINING MESA AZ
|
| Head-mounted displays (HMDs) have not previously been combined with flat-panel display systems and it was unknown whether viewing two displays at differing focal plane distances would lead to perceived blurring or visual discomfort. This is now a concern as the Joint Helmet Mounted Cueing System (JHMCS) is integrated with existing flat-panel display systems such as the Mobile Modular Display for Advanced Research and Training (M2DART). The degree of blurring that ... |
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| Binocular Rivalry and Attention in Helmet-Mounted Display Applications |
FEB 2007 |
8 pages |
| Authors:
Marc D. Winterbottom; Robert Patterson; Byron J. Pierce; Christin Covas; Jason Rogers; LINK SIMULATION AND TRAINING MESA AZ
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| As monocular head-mounted displays (HMDs) are introduced into existing flight simulators for training and mission rehearsal it will be important to determine whether binocular rivalry affects the visibility of HMD presented symbology or the out-the-window (OTW) flight simulator display imagery. In the present study, we examined whether rivalry suppression could be objectively measured under conditions that simulated a monocular HMD and OTW display, and whether voluntary attention and moving imagery ... |
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| Graphical User Interfaces for Digital-Image Frequency Analysis |
DEC 2006 |
12 pages |
| Authors:
Chi-Feng Tai; James P. Gaska; George A. Geri; LINK SIMULATION AND TRAINING MESA AZ
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| Frequency analysis plays an important role in the area of visual research. The application described in this technical memorandum provides a graphical user interface that simplifies loading, analyzing, and storing the results of common frequency analysis tasks. The application allows the user to load image files and compute: a 2-D discrete Fourier transform (DFT) of the image, a polar transform (orientation and radial spatial frequency) of the DFT, or a ... |
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| Brightness and Spatial Resolution of a Prototype, Green-Laser Projector Measured for Various Display Screens and Image Sizes |
DEC 2006 |
11 pages |
| Authors:
George A. Geri; Marc D. Winterbottom; LINK SIMULATION AND TRAINING MESA AZ
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| Laser light has many unique characteristics, such as coherence and speckle, and in addition, the individual pixels formed by the raster structure of a laser projector have very little persistence. As a result, there is some question as to whether the luminance of laser-projector imagery can be measured accurately, and whether that imagery will appear the same as more conventional imagery of the same luminance. In a preliminary attempt to ... |
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| A Comparison of the Temporal Characteristics of LCS, LCoS, Laser, and CRT Projectors |
DEC 2006 |
14 pages |
| Authors:
George A. Geri; William D. Morgan; LINK SIMULATION AND TRAINING MESA AZ
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| We have measured the temporal response of a commercial liquid crystal on silicon (LCoS) projector, and have compared it to that of commercial liquid crystal display (LCD) and cathode ray tube (CRT) projectors, as well as to a prototype laser projector. The faster temporal response of LCoS displays, as compared to more conventional LCDs, has not been considered a major factor in their commercial use, and so individual pixels are ... |
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| The Variability of Spatial Resolution Estimates Obtained Using a CCD Camera |
DEC 2006 |
11 pages |
| Authors:
George A. Geri; Kristin J. Caufield; Marc D. Winterbottom; LINK SIMULATION AND TRAINING MESA AZ
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| We have previously developed techniques for measuring the spatial resolution of flight simulator displays. In the present experiment, we estimate the relative variability of the measurement technique and the display projectors they were designed to assess. We use the ratio of the standard deviation and mean of the resolution estimates as a measure of variability. Variability was found to be about 1.3% for grating transparencies illuminated by a stable light ... |
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| Perceptual Tests of the Temporal Properties of a Shuttered LCD Projector |
AUG 2006 |
7 pages |
| Authors:
Marc D. Winterbottom; George A. Geri; Bill Morgan; Craig Eidman; Jim Gaska; Byron Pierce; LINK SIMULATION AND TRAINING MESA AZ
|
| Perceptual motion blur was studied in imagery presented on an LCD projector equipped with a mechanical shutter to reduce pixel hold-time. Perceptual measures of image blur were obtained with both a simple test stimulus, as well as real-world imagery. Both were found to correlate well with the measured pixel hold-time. |
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| Identification of Simulated Targets as a Function of Target and Background Blur |
May-2005 |
5 pages |
| Authors:
Jennifer Winner; George A Geri; Shama C Akhtar; Byron J Pierce; LINK SIMULATION AND TRAINING MESA AZ
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| Simulated imagery was used to determine the effect of target and background blur on target identification performance. An interaction between these two variables was found, indicating that greater image detail may not improve performance, and hence may not be required in applications for which high-resolution databases are not readily available. |
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| Effect of Display Resolution and Antialiasing on the Discrimination of Simulated-Aircraft Orientation |
2005 |
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| Authors:
George A. Geri; Marc D. Winterbottom; LINK SIMULATION AND TRAINING MESA AZ
|
 | In Experiment 1, antialiasing was found to improve performance on an orientation-discrimination task, whereas increasing display pixel-count did not. The latter finding was attributed to a decrease in image contrast associated with driving the CRT beyond its effective bandwidth. In Experiment 2, it was found that display resolution is the primary determinant of orientation-discrimination performance. This performance was not significantly improved by increasing antialiasing beyond a minimal level, suggesting that ... |
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| Evaluating the Spatial Resolution of Flight-Simulator Visual Displays |
JUN 2004 |
41 pages |
| Authors:
George A. Geri; Marc D. Winterbottom; Byron J. Pierce; LINK SIMULATION AND TRAINING MESA AZ
|
| This paper documents a technique for assessing the spatial resolution of visual display systems like those currently used for flight simulation at the Air Force Research Laboratory (AFRL), Mesa, Arizona. The introduction defines spatial resolution, and how best to apply the concept in the context of visual display evaluation. The measurement technique is described in detail, as are the CCD-based light measurement device and the techniques developed to calibrate it. ... |
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