Dr. Albert J. Ahumada Profile

Dr. Albert J. Ahumada

Research Psychologist at NASA Ames Research Ctr

SPIE Involvement:

Conference Program Committee | Author

Publications (27)

PROCEEDINGS ARTICLE | March 14, 2013

Visible contrast energy metrics for detection and discrimination

Proc. SPIE. 8651, Human Vision and Electronic Imaging XVIII

KEYWORDS: Target detection, Optical filters, MATLAB, Data modeling, Spatial frequencies, Interference (communication), Image filtering, Contrast sensitivity, Signal detection, Performance modeling

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PROCEEDINGS ARTICLE | February 10, 2009

The dynamic range of visual imagery in space

Proc. SPIE. 7240, Human Vision and Electronic Imaging XIV

KEYWORDS: Visible radiation, Eye, Sun, Stars, Visualization, Cameras, Image processing, Visual system, High dynamic range imaging, Earth's atmosphere

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PROCEEDINGS ARTICLE | February 9, 2006

Symbol discriminability models for improved flight displays

Proc. SPIE. 6057, Human Vision and Electronic Imaging XI

KEYWORDS: Displays, Diamond, Visual process modeling, Data modeling, Computational modeling, Calibration, Image resolution, Feature extraction, Performance modeling, RGB color model

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PROCEEDINGS ARTICLE | June 17, 2003

Contrast measures for predicting text readability

Proc. SPIE. 5007, Human Vision and Electronic Imaging VIII

KEYWORDS: Transparency, Visualization, Calibration, Error analysis, LCDs, Human vision and color perception, Psychology, Virtual reality, Electronic imaging, Heads up displays

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PROCEEDINGS ARTICLE | May 30, 2002

Towards a spatio-chromatic standard observer for detection

Proc. SPIE. 4662, Human Vision and Electronic Imaging VII

KEYWORDS: Visual process modeling, Data modeling, Modulation, Visualization, Spatial frequencies, Databases, Colorimetry, Distance measurement, Human vision and color perception, Contrast sensitivity

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PROCEEDINGS ARTICLE | June 8, 2001

Masking in color images

Proc. SPIE. 4299, Human Vision and Electronic Imaging VI

KEYWORDS: Target detection, Visual process modeling, Data modeling, Spatial frequencies, Error analysis, Linear filtering, Image filtering, Contrast sensitivity, Color vision, RGB color model

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PROCEEDINGS ARTICLE | June 2, 2000

Detection of distortion in small moving images compared to the predictions of spatial-temporal model

Proc. SPIE. 3959, Human Vision and Electronic Imaging V

KEYWORDS: Internet, Image compression, Visual process modeling, Visualization, Image processing, Video, Distortion, Image quality, Video compression, Performance modeling

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PROCEEDINGS ARTICLE | May 19, 1999

Discriminability measures for predicting readability

Proc. SPIE. 3644, Human Vision and Electronic Imaging IV

KEYWORDS: Target detection, Image compression, Visual process modeling, Visualization, Spatial frequencies, Image quality, Image filtering, Contrast sensitivity, Visibility, RGB color model

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PROCEEDINGS ARTICLE | May 19, 1999

Nonlinear features in vernier acuity

Proc. SPIE. 3644, Human Vision and Electronic Imaging IV

KEYWORDS: Mathematical modeling, Visual process modeling, Data modeling, Spatial filters, Silicon, Gaussian filters, Nonlinear optics, Image filtering, Image classification, Convolution

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PROCEEDINGS ARTICLE | May 19, 1999

Spatio-temporal discrimination model predicting IR target detection

Proc. SPIE. 3644, Human Vision and Electronic Imaging IV

KEYWORDS: Target detection, Infrared detectors, Infrared imaging, Visual process modeling, Data modeling, Visualization, Image processing, Surveillance, Infrared radiation, Eye models

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PROCEEDINGS ARTICLE | October 6, 1998

Predictive optical-flow algorithm for aircraft detection

Proc. SPIE. 3522, Intelligent Robots and Computer Vision XVII: Algorithms, Techniques, and Active Vision

KEYWORDS: Target detection, Nose, Detection and tracking algorithms, Cameras, Video, Optical testing, Computer vision technology, Machine vision, Optical flow, Algorithm development

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PROCEEDINGS ARTICLE | July 17, 1998

Spatiotemporal discrimination model predicts temporal masking functions

Proc. SPIE. 3299, Human Vision and Electronic Imaging III

KEYWORDS: Optical filters, Visual process modeling, Spatial frequencies, Calibration, Image processing, Control systems, Linear filtering, Image filtering, Visual system, Contrast sensitivity

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PROCEEDINGS ARTICLE | July 17, 1998

Technique to extract relevant image features for visual tasks

Proc. SPIE. 3299, Human Vision and Electronic Imaging III

KEYWORDS: Image visualization, Visual process modeling, Visualization, Pattern recognition, Silicon, Feature extraction, Image filtering, Image classification, Sensory processes, Human vision research

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PROCEEDINGS ARTICLE | June 3, 1997

Image discrimination models: detection in fixed and random noise

Proc. SPIE. 3016, Human Vision and Electronic Imaging II

KEYWORDS: Target detection, Statistical analysis, Visual process modeling, Signal attenuation, Interference (communication), Visual system, Signal detection, Eye models, Systems modeling, Visibility

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PROCEEDINGS ARTICLE | June 3, 1997

Image discrimination models predict signal detection in natural medical image backgrounds

Proc. SPIE. 3016, Human Vision and Electronic Imaging II

KEYWORDS: Spatial frequencies, X-rays, Interference (communication), Medical imaging, Image filtering, Angiography, X-ray imaging, Signal detection, Statistical modeling, Performance modeling

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PROCEEDINGS ARTICLE | April 16, 1997

What is degrading human visual detection peformance in natural medical image backgrounds?

Proc. SPIE. 3036, Medical Imaging 1997: Image Perception

KEYWORDS: Visual process modeling, Data modeling, Visualization, Image processing, Interference (communication), Medical imaging, Image quality, Signal detection, Statistical modeling, Performance modeling

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PROCEEDINGS ARTICLE | April 22, 1996

Object detection in a noisy scene

Proc. SPIE. 2657, Human Vision and Electronic Imaging

KEYWORDS: Target detection, Visual process modeling, Visualization, Spatial frequencies, Error analysis, Interference (communication), Digital imaging, Image filtering, Performance modeling, Visibility

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PROCEEDINGS ARTICLE | April 21, 1995

Fast DCT block smoothing algorithm

Proc. SPIE. 2501, Visual Communications and Image Processing '95

KEYWORDS: Image compression, Data modeling, Optical coherence tomography, Error analysis, Image restoration, Image quality, Signal processing, Quantization, Smoothing, Algorithm development

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PROCEEDINGS ARTICLE | April 20, 1995

Models of human image discrimination predict object detection in natural backgrounds

Proc. SPIE. 2411, Human Vision, Visual Processing, and Digital Display VI

KEYWORDS: Target detection, Data modeling, Digital filtering, Medical imaging, Image quality, Digital imaging, Image filtering, Analytical research, Target recognition, Contrast sensitivity

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PROCEEDINGS ARTICLE | May 1, 1994

Deblocking DCT compressed images

Proc. SPIE. 2179, Human Vision, Visual Processing, and Digital Display V

KEYWORDS: Image compression, Spatial frequencies, Error analysis, Computer programming, Image analysis, Transform theory, Image quality, Quantization, Visual system, Algorithm development

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PROCEEDINGS ARTICLE | May 1, 1994

Discrete cosine transform (DCT) basis function visibility: effects of viewing distance and contrast masking

Proc. SPIE. 2179, Human Vision, Visual Processing, and Digital Display V

KEYWORDS: Image compression, Visual process modeling, Data modeling, Visualization, Matrices, Image resolution, Quantization, Optical resolution, Contrast sensitivity, Visibility

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PROCEEDINGS ARTICLE | September 8, 1993

Improved detection model for DCT coefficient quantization

Proc. SPIE. 1913, Human Vision, Visual Processing, and Digital Display IV

KEYWORDS: Image compression, Data modeling, Spatial frequencies, Matrices, Chromium, Colorimetry, Quantization, Neon, Visibility, RGB color model

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PROCEEDINGS ARTICLE | August 27, 1992

Color matrix display simulation based on luminance and chromatic contrast sensitivity of early vision

Proc. SPIE. 1666, Human Vision, Visual Processing, and Digital Display III

KEYWORDS: Mathematical modeling, Image visualization, Visual process modeling, Visualization, Spatial frequencies, Image processing, Colorimetry, Signal processing, Contrast sensitivity, CRTs

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PROCEEDINGS ARTICLE | August 27, 1992

Luminance-model-based DCT quantization for color image compression

Proc. SPIE. 1666, Human Vision, Visual Processing, and Digital Display III

KEYWORDS: Image compression, Visual process modeling, Data modeling, Visualization, Spatial frequencies, Matrices, Quantization, Human vision and color perception, Neon, Visibility

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PROCEEDINGS ARTICLE | August 27, 1992

Principled halftoning based on human vision models

Proc. SPIE. 1666, Human Vision, Visual Processing, and Digital Display III

KEYWORDS: Visual process modeling, Visualization, Image processing, Diffusion, Quality measurement, Image quality, Quantization, Image filtering, Human vision and color perception, Halftones

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PROCEEDINGS ARTICLE | June 1, 1991

Network compensation for missing sensors

Proc. SPIE. 1453, Human Vision, Visual Processing, and Digital Display II

KEYWORDS: Visual process modeling, Visualization, Spatial frequencies, Sensors, Calibration, Image processing, Linear filtering, Image filtering, Human vision and color perception, Algorithm development

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PROCEEDINGS ARTICLE | October 1, 1990

Learning receptor positions from imperfectly known motions

Proc. SPIE. 1249, Human Vision and Electronic Imaging: Models, Methods, and Applications

KEYWORDS: Statistical analysis, Visual process modeling, Sensors, Calibration, Error analysis, Solids, Visual system, Human vision and color perception, Receptors, Electronic imaging

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