Polarization and absorption effects on the Fraunhofer diffraction patterns of a corner reflector
Polarization and absorption effects on Fraunhofer diffraction patterns of corner reflector
REFLECTOR↗
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Results for “pattern”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electroencephalographic baselines in astronaut candidates estimated by computation and pattern recognition techniques
Electroencephalographic baselines in astronaut candidates estimated by computer and pattern recognition techniques
ELECTROENCEPHALOGRAPHY↗
Experimental studies of current distributions and radiation patterns of a resistively loaded V-antenna at quarter scale for a radio astronomy Explorer satellite Final report
Current distributions and radiation patterns of resistively loaded V-antenna at quarter scale for radio astronomy Explorer satellite
ANTENNA↗
System identification and pattern recognition
New method for system identification based on relaxation technique used in pattern recognition
IDENTIFICATION↗
Cloud pattern recognition
Feasibility of perceptron type computer for recognition of vortex patterns in cloud cover photographs
CLOUD COVER↗
Research on the utilization of pattern recognition techniques to identify and classify objects in video data Technical progress report, 31 Jan. - 31 May 1967
Pattern recognition techniques for extracting information from video data and for reducing amount of data to convey this information - decision mechanisms and property filters
VIDEO DATA↗
Application of moire patterns to lunar mapping
Applicability of moire patterns produced by superposed screens in analysis of lineaments on lunar photographs
PHOTOGRAPH INTERPRETATION↗
Weather Satellite Picture Pattern Recognition and Compression Study Final report, 16 Dec. 1966 - 16 Jun. 1967
Weather satellite picture pattern discrimination method
PATTERN RECOGNITION↗
Gain computations from pattern integration.
Correction for gain computations based on pattern integration during translational motion of antenna
ANTENNA FIELD↗
Electroencephalographic baselines in astronaut candidates estimated by computation and pattern recognition techniques.
EEG baselines covering wide range of states of wakefulness and sleep in astronaut candidates estimated by computation and pattern recognition techniques
COMPUTER METHOD↗
System identification and pattern recognition.
Input/output model of system with finite settling time, using error correcting technique employed in pattern recognition
PATTERN RECOGNITION↗
Noise methods in pattern perception.
Visual noise induction methods investigated at seven noise levels, discussing pattern comparisons by 46 subjects
NOISE INTENSITY↗
Effect of display movement on tactile pattern perception.
Effect of display movement on tactile pattern perception
TACTILE SENSATION↗
Response latency in a pattern perception situation.
Response latency in visual pattern perception situation
TIME FACTOR↗
Bifurcating optical pattern recognition in photorefractive crystals
A concept of bifurcating optical pattern rocognizer (BIOPAR) is described and demonstrated experimentally, using barium titanate crystal. When an input is applied to BIOPAR, the output may be directed to two ports.
BARIUM TITANATE↗
Visual detection of spatial contrast patterns: evaluation of five simple models
The ModelFest Phase One dataset is a collection of luminance contrast thresholds for 43 two-dimensional monochromatic spatial patterns confined to an area of approximately two by two degrees. These data were collected by a collaboration among twelve laboratories, and were designed to provide a common database for calibration and testing of spatial vision models. Here I report fits of the ModelFest data with five models: Peak Contrast, Contrast Energy, Generalized Energy, a Gabor Channels model, and a Discrete Cosine Transform model. The Gabor Channels model provides the best fit, though the other, simpler models, with the exception of Peak Contrast, provide remarkably good fits as well. Though there are clear individual differences, regularities in the data suggest the possibility of constructing a standard observer for spatial vision. c2000 Optical Society of America.
NASA Discipline Space Human Factors↗
The evolution of embryonic patterning mechanisms in animals
Animals exhibit an enormous diversity of life cycles and larval morphologies. The developmental basis for this diversity is not well understood. It is clear, however, that mechanisms of pattern formation in early embryos differ significantly among and within groups of animals. These differences show surprisingly little correlation with phylogenetic relationships; instead, many are correlated with ecological factors, such as changes in life histories. Copyright 2000 Academic Press.
Review, Tutorial↗