Dr. Albert J. Ahumada Profile

Dr. Albert J. Ahumada

Research Psychologist at NASA Ames Research Ctr

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 14 March 2013 Paper

Visible contrast energy metrics for detection and discrimination

Albert Ahumada, Andrew Watson

Proceedings Volume 8651, 86510D (2013) https://doi.org/10.1117/12.2009383

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

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Proceedings Article | 10 February 2009 Paper

The dynamic range of visual imagery in space

Albert Ahumada, Mary Kaiser, Jeffrey Mulligan

Proceedings Volume 7240, 72400M (2009) https://doi.org/10.1117/12.817184

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

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Proceedings Article | 9 February 2006 Paper

Symbol discriminability models for improved flight displays

Albert Ahumada, Maite Trujillo San-Martin, Jennifer Gille

Proceedings Volume 6057, 605711 (2006) https://doi.org/10.1117/12.650875

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

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Proceedings Article | 17 June 2003 Paper

Contrast measures for predicting text readability

Lauren Scharff, Albert Ahumada

Proceedings Volume 5007, (2003) https://doi.org/10.1117/12.479663

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

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Proceedings Article | 30 May 2002 Paper

Towards a spatio-chromatic standard observer for detection

Sophie Wuerger, Andrew Watson, Albert Ahumada

Proceedings Volume 4662, (2002) https://doi.org/10.1117/12.469512

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

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Proceedings Article | 8 June 2001 Paper

Masking in color images

Albert Ahumada, William Krebs

Proceedings Volume 4299, (2001) https://doi.org/10.1117/12.429488

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

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Proceedings Article | 2 June 2000 Paper

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

Kjell Brunnstroem, Bo Schenkman, Albert Ahumada

Proceedings Volume 3959, (2000) https://doi.org/10.1117/12.387154

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

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Proceedings Article | 19 May 1999 Paper

Spatio-temporal discrimination model predicting IR target detection

Kjell Brunnstroem, Robert Eriksson, Albert Ahumada

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348461

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

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Proceedings Article | 19 May 1999 Paper

Discriminability measures for predicting readability

Lauren Scharff, Albert Ahumada, Alyson Hill

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348448

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

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Proceedings Article | 19 May 1999 Paper

Nonlinear features in vernier acuity

Erhardt Barth, Bettina Beard, Albert Ahumada

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348485

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

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Proceedings Article | 6 October 1998 Paper

Predictive optical-flow algorithm for aircraft detection

Jeffrey McCandless, Albert Ahumada

Proceedings Volume 3522, (1998) https://doi.org/10.1117/12.325764

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

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Proceedings Article | 17 July 1998 Paper

Spatiotemporal discrimination model predicts temporal masking functions

Albert Ahumada, Bettina Beard, Robert Eriksson

Proceedings Volume 3299, (1998) https://doi.org/10.1117/12.320103

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

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Proceedings Article | 17 July 1998 Paper

Technique to extract relevant image features for visual tasks

Bettina Beard, Albert Ahumada

Proceedings Volume 3299, (1998) https://doi.org/10.1117/12.320099

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

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Proceedings Article | 3 June 1997 Paper

Image discrimination models predict signal detection in natural medical image backgrounds

Miguel Eckstein, Albert Ahumada, Andrew Watson

Proceedings Volume 3016, (1997) https://doi.org/10.1117/12.274531

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

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Proceedings Article | 3 June 1997 Paper

Image discrimination models: detection in fixed and random noise

Albert Ahumada, Bettina Beard

Proceedings Volume 3016, (1997) https://doi.org/10.1117/12.274520

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

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Proceedings Article | 16 April 1997 Paper

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

Miguel Eckstein, Albert Ahumada, Andrew Watson, James Whiting

Proceedings Volume 3036, (1997) https://doi.org/10.1117/12.271311

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

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Proceedings Article | 22 April 1996 Paper

Object detection in a noisy scene

Albert Ahumada, Bettina Beard

Proceedings Volume 2657, (1996) https://doi.org/10.1117/12.238715

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

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Proceedings Article | 21 April 1995 Paper

Fast DCT block smoothing algorithm

Rensheng Horng, Albert Ahumada

Proceedings Volume 2501, (1995) https://doi.org/10.1117/12.206752

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

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Proceedings Article | 20 April 1995 Paper

Models of human image discrimination predict object detection in natural backgrounds

Albert Ahumada, Andrew Watson, Ann Rohaly

Proceedings Volume 2411, (1995) https://doi.org/10.1117/12.207554

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

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Proceedings Article | 1 May 1994 Paper

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

Andrew Watson, Joshua Solomon, Albert Ahumada, Alan Gale

Proceedings Volume 2179, (1994) https://doi.org/10.1117/12.172661

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

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Proceedings Article | 1 May 1994 Paper

Deblocking DCT compressed images

Albert Ahumada, Rensheng Horng

Proceedings Volume 2179, (1994) https://doi.org/10.1117/12.172662

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

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Proceedings Article | 8 September 1993 Paper

Improved detection model for DCT coefficient quantization

Heidi Peterson, Albert Ahumada, Andrew Watson

Proceedings Volume 1913, (1993) https://doi.org/10.1117/12.152693

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

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Proceedings Article | 27 August 1992 Paper

Luminance-model-based DCT quantization for color image compression

Albert Ahumada, Heidi Peterson

Proceedings Volume 1666, (1992) https://doi.org/10.1117/12.135982

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

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Proceedings Article | 27 August 1992 Paper

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

Russel Martin, Albert Ahumada, James Larimer

Proceedings Volume 1666, (1992) https://doi.org/10.1117/12.135979

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

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Proceedings Article | 27 August 1992 Paper

Principled halftoning based on human vision models

Jeffrey Mulligan, Albert Ahumada

Proceedings Volume 1666, (1992) https://doi.org/10.1117/12.135960

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

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Proceedings Article | 1 June 1991 Paper

Network compensation for missing sensors

Albert Ahumada, Jeffrey Mulligan

Proceedings Volume 1453, (1991) https://doi.org/10.1117/12.44350

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

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Proceedings Article | 1 October 1990 Paper

Learning receptor positions from imperfectly known motions

Albert Ahumada, Jeffrey Mulligan

Proceedings Volume 1249, (1990) https://doi.org/10.1117/12.19665

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

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