14.3: Reserved Highlight Region for HDR and Megacontrast Display Algorithms

2010 ◽  
Vol 41 (1) ◽  
pp. 188
Author(s):  
Scott Daly
Keyword(s):  
Display Algorithms

scholarly journals Comparison of Topographic Technologies in Anterior Surface Mapping of Keratoconus using Two Display Algorithms and Six Corneal Topography Devices

2012 ◽  
Vol 1 (3) ◽  
pp. 153-157
Author(s):  
Cynthia J Roberts ◽  
Richard G Lembach ◽  
George A Markakis ◽  
James W Harris
Keyword(s):  
Repeated Measures ◽  
Corneal Topography ◽  
Radius Of Curvature ◽  
Axial Distance ◽  
Anterior Surface ◽  
Surface Mapping ◽  
Mean Values ◽  
Display Algorithms ◽  
Cone Apex ◽  
Greater Curvature

ABSTRACT Purpose To evaluate anterior surface topographic technologies and display algorithms in mapping keratoconus. Materials and methods A total of 27 eyes of 17 subjects clinically diagnosed with keratoconus were imaged on six topographers: EyeSys, Alcon EyeMap, Keratron, TMS-1, Orbscan and PAR corneal topography system. Axial distance (AD) and instantaneous radius of curvature (IROC) algorithms were generated, and the cone apex was determined manually using a cursor. Intermachine comparisons for cone magnitude (steepest curvature), as well as cone location in radius and meridian were performed for each display algorithm using both AD and IROC. Significance (p < 0.05) was determined using repeated measures analysis of variance (ANOVA) on successive mean values. Maps were also evaluated for processability, defined by the ability to reconstruct a reasonable map for each subject, not map quality. Results There were no significant differences between successive means for cone location in either radial or meridional directions. For AD, Orbscan was greater than both small mire Placido devices (Keratron and TMS-1), which were not different from each other. The small mire devices had significantly greater curvature magnitude than the large mire placido devices (EyeSys, Alcon EyeMap) which were not different from each other. Finally, PAR was significantly lower than the large mire Placido devices. For IROC, the pattern was the same with the exception that the Orbscan was not different than the small mire Placido devices in curvature magnitude. For processing success, the PAR had 100% processability, and all other devices were between 73 and 77%. Conclusion In monitoring keratoconus, evaluation of change over time is fundamental to treatment decisions, making understanding of topographic technology differences in mapping keratoconic corneas extremely important. How to cite this article Markakis GA, Roberts CJ, Harris JW, Lembach RG. Comparison of Topographic Technologies in Anterior Surface Mapping of Keratoconus using Two Display Algorithms and Six Corneal Topography Devices. Int J Kerat Ect Cor Dis 2012;1(3):153-157.

Prediction and Quickening in Perspective Flight Displays for Curved Landing Approaches

1979 ◽  
Vol 23 (1) ◽  
pp. 498-502 ◽  
Author(s):  
Richard S. Jensen
Keyword(s):  
Empirical Test ◽  
Vertical Dimension ◽  
Third Order ◽  
Vertical Control ◽  
Display Algorithms ◽  
Subject Design ◽  
Highly Effective

In an empirical test of various predictor and quickened display algorithms eighteen professional pilot-subjects made four curved-path landing approaches in a Gat-2 simulator using each of 14 dynamically different display configurations in a within-subject design. Results indicate that second- and third-order predictor displays provide the best lateral performance. Intermediate levels of prediction and quickening provide best vertical control. Predictor-quickening algorithms of increasing computational order signficantly reduce aileron, rudder, and elevator control responses, reflecting successive reductions in cockpit workload. Whereas conventional crosspointer displays are not adequate for curved landing approaches, perspective displays with predictors and some vertical dimension quickening are highly effective.

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