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What is Human System Integration? Website
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Albert J. Ahumada
Research Psychologist
Phone: 650-604-6257
Curriculum Vitae  (click to expand/minimize)
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(2015)  Ames Technology Award, Patent Award for Stroboscopic Image Modulation to Reduce Visual Blur of an Object Being Viewed by an Observer Experiencing Vibratio
(2015)  Ames Technology Award, Patent Award for Visible Motion Blur
(2015)  Ames Technology Award, Tech Brief Award for Motion Blur Evaluation Techniques
(2015)  Ames Technology Award, Tech Brief Award for System to Estimate Visual Acuity from Wavefront Aberrations
(2006)  Privately Sponsored, Optical Society of America Fellowship
(1992)  Ames Honor Award, Exceptional Scientific Achievement Medal (ESAM)
(1990)  Ames Honor Award, H. Julian Allen Award
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PDF download  A. J. Ahumada, B. L. Beard, & C. H. Null (2017) Accounting for the Speed-Accuracy Trade-Off in Quantifying Human-In-The-Loop Error Probabilities, Proceedings of AIAA SciTech Forum and Exposition. Grapevine, TX. January 9-13, 2017 Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (2015) Extending the Flicker Visibility Metric to a Range of Mean Luminance, SID Symposium Digest of Technical Papers, 46 Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (2015) Letter identification and the Neural Image Classifier, Journal of Vision, 15(2):15, 1-26 Click to read more
D. . Bauer, P. . Picciano, B. L. Beard, J. B. Holbrook, & A. J. Ahumada (2012) An initial inventory of pilot and air traffic control performance data to support aviation simulations, Proceedings of the 4th AHFE International Conference on Applied Human Factors and Ergonomics, San Francisco, CA Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (2012) Modeling acuity for optotypes varying in complexity, Journal of Vision, 12(10), 1-19, http://journalofvision.org/12/10/19/ Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (2011) Blur Clarified: A review and synthesis of blur discrimination, Journal of Vision, 11(5), 1-23 Click to read more
B. L. Beard, J. B. Holbrook, C. T. Geven, & A. J. Ahumada (2009) Assessment of cognitive abilities in simulated space ascent environments (No. 2009-01-2425), SAE Technical Paper. Click to read more
A. J. Ahumada, M. K. Kaiser, & J. B. Mulligan (2009) The dynamic range of visual imagery in space, in Rogowitz, B. E., and Pappas, T. N. (eds.), Human Vision and Electronic Imaging XIV, Proc. SPIE, v. 7240 Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (2008) Predicting visual acuity from wavefront aberrations, Journal of Vision, 8(4), 1-19 Click to read more
PDF download  A. J. Ahumada, M. T. Trujillo, & J. . Gille (2006) Symbol discriminability models for improved flight displays, Human Vision and Electronic Imaging XI, B.E. Rogowitz and T.N. Pappas, eds., SPIE Proc. 6057, Paper 30 Click to read more
A. J. Ahumada (2005) A local contrast metric. Click to read more
A. B. Watson, & A. J. Ahumada (2005) A standard model for foveal detection of spatial contrast, Watson, A. B., & Ahumada, A. J., Jr. (2005). A standard model for foveal detection of spatial contrast. Journal of Vision, 5(9), 717-740, http://journalofvision.org/5/9/6/, doi:10.1167/5.9.6. Click to read more
B. L. Beard, K. M. Jones, C. . Chacon, & A. J. Ahumada (2005) Empirical basis for an occupational vision standard, Office of the Chief Scientist for Human Factors Aviation Maintenance Human Factors, 40 Click to read more
A. J. Ahumada, B. L. Beard, & K. M. Jones (2005) Modeling the detection of blurred visual targets in non-homogeneous backgrounds, Journal of Vision, 5(8), 484-484 Click to read more
A. J. Ahumada, & B. L. Beard (2005) Multipole-based CSF estimates predict crack detection individual differences. Click to read more
A. B. Watson, & A. J. Ahumada (2005) Spatial Standard Observer for Visual Technology, Proceedings of the IEEE International Conference on Systems, Man, and Cybernetics (SMC) Click to read more
L. F.V.. Scharff, & A. J. Ahumada (2005) Understanding text polarity effects, European Conference on Visual Perception. Click to read more
A. J. Ahumada, & B. L. Beard (2003) Computational models and occupational vision standards for acuity and contrast sensitivity.. Click to read more
PDF download  A. J. Ahumada, & L. F.V.. Scharff (2003) Contrast measures for predicting text readability, Human Vision and Electronic Imaging VIII, B.E. Rogowitz and T.N. Pappas, eds., SPIE Proc. 5007, 463-472 Click to read more
A. J. Ahumada (2003) Letter identification: Contrast polarity and speed-accuracy trade-off strategies. Click to read more
A. J. Ahumada (2003) Object detection in cluttered infrared images. Click to read more
PDF download  A. J. Ahumada, & B. L. Beard (2003) Using Vision Modeling to Define Occupational Vision Standards, Proceedings of 2003 Human Factors and Ergonomics Society Annual Meeting Click to read more
PDF download  W. K. Krebs, J. . Xing, & A. J. Ahumada (2002) A simple tool for predicting the readability of a monitor, Proceedings of the 46th Annual Meeting of the Human Factors and Ergonomics Society, 46, (September, Baltimore MD) 1659-1663 Click to read more
A. J. Ahumada, & J. . Xing (2002) Estimation of human-observer templates in time-varying noise. Click to read more
L. F.V.. Scharff, & A. J. Ahumada (2002) Identification of filtered letters in filtered noise. Click to read more
B. L. Beard, W. A. Hisle, & A. J. Ahumada (2002) Occupational vision standards: A review, Report for FAA AAR-100 Click to read more
PDF download  A. J. Ahumada, & L. F.V.. Scharff (2002) Predicting the Readability of Transparent Text, JOV 2(1), 121-131 Click to read more
PDF download  S. . Wuerger, A. B. Watson, & A. J. Ahumada (2002) Toward a standard observer for spatio-chromatic detection, SPIE Proc. Vol. 4662, 159-172 Click to read more
PDF download  W. K. Krebs, & A. J. Ahumada (2001) Air traffic control weather radar displays: Validation of a masking metric for prediction of text block identification, Annual Meeting of the Human Factors and Ergonomics Society, October 2001, Minneapolis MN Click to read more
PDF download  A. J. Ahumada, & W. K. Krebs (2001) Masking in color images, Human Vision and Electronic Imaging VI, B.E. Rogowitz and T.N. Pappas, eds., SPIE Proc. Vol. 4299, 187-194 Click to read more
PDF download  A. J. Ahumada (2000) Classification Image Weights and Internal Noise Level Estimation, Journal of Vision, 2(1), 121-131. http://www.journalofvision.org/2/1/8/ Click to read more
PDF download  K. . Brunnstrom, B. M. Schenkman, & A. J. Ahumada (2000) Detection of Distortion in Small Moving Images Compared to the Predictions of Spatio-Temporal Model, Human Vision and Electronic Imaging IV, eds. B.E. Rogowitz and T.N. Pappas, Proc. Vol. 3959, paper 18, SPIE, San Jose, CA Click to read more
PDF download  L. F.V.. Scharff, A. L. Hill, & A. J. Ahumada (2000) Discriminability measures for predicting readability of text on textured backgrounds, Optics Express, 6(4), 81-90 Click to read more
PDF download  B. L. Beard, & A. J. Ahumada (1999) Detection in fixed and random noise in foveal and parafoveal vision explained by template learning, JOSA A, 16(3), 755-763 Click to read more
L. F.V.. Scharff, & A. J. Ahumada (1999) Discriminability measures for predicting readability of text on textured backgrounds, Human Vision and Electronic Imaging III, B.E. Rogowitz and T.N. Pappas, eds., Proc. Vol. 3644, pp. 270-277, SPIE, San Jose, CA Click to read more
PDF download  T. S. Barth, B. L. Beard, & A. J. Ahumada (1999) Nonlinear features in vernier acuity, In B. E. Rogowitz and T. N. Pappas, eds., Human Vision and Electronic Imaging IV, SPIE Proceedings Vol. 3644, paper 8, 1999 Click to read more
PDF download  K. . Brunnstrom, R. A. Erickson, & A. J. Ahumada (1999) Spatio-temporal discrimination model predicting IR target detection, Human Vision and Electronic Imaging III, ed. B.E. Rogowitz and T.N. Pappas, Proc. Vol. 3644, pp. 403-410, SPIE, San Jose, CA Click to read more
A. J. Ahumada, & B. L. Beard (1999) Template learning models for visual target detection in fixed and random noise, Special issue of the Journal of Optical Technology (English) and the Opticheskii Zhurnal (Russian), 66(9, 10), 59-64 Click to read more
J. W. McCandless, & A. J. Ahumada (1998) A predictive optical flow algorithm for aircraft detection, Proceedings of the SPIE Intelligent Mechanisms and Advanced Manufacturing Conference, 3522: 193-203 Click to read more
PDF download  A. J. Ahumada, & B. L. Beard (1998) A simple vision model for inhomogeneous image quality assessment, SID Digest of Technical Papers, 29, Paper 40.1 Click to read more
A. J. Ahumada, B. L. Beard, & R. A. Erickson (1998) Spatio-temporal discrimination model predicts temporal masking functions, B. E. Rogowitz and T. N. Pappas, eds., Human Vision and Electronic Imaging III SPIE Proceedings Vol. 3299, pp. 120-127 Click to read more
B. L. Beard, & A. J. Ahumada (1998) Technique to extract relevant image features for visual tasks, B. E. Rogowitz and T. N. Pappas, eds., Human Vision and Electronic Imaging III SPIE Proceedings Vol. 3299, pp. 79-85 Click to read more
A. J. Ahumada, & B. L. Beard (1997) Image discrimination models predict detection in fixed but not random noise, Journal of the Optical Society of America A, 14(9), 2471-2476 Click to read more
A. J. Ahumada, & B. L. Beard (1997) Image discrimination models: detection in fixed and random noise, Proceedings of IS&T/SPIE Electronic Imaging Symposium, February 8, 1997, San Jose CA, Paper # 3016-03 Click to read more
A. M. Rohaly, A. J. Ahumada, & A. B. Watson (1997) Object detection in natural backgrounds predicted by discrimination performance and models, Vision Research, 37, 3225-3235 Click to read more
PDF download  M. P. Eckstein, A. J. Ahumada, & A. B. Watson (1997) Visual signal detection in structured backgrounds. II. Effects of contrast gain control, background variations and white noise, Journal of the Optical Society A, 14(9), 2406-2419 Click to read more
M. P. Eckstein, A. J. Ahumada, & A. B. Watson (1997) What is degrading human detection performance in natural medical image backgrounds?, Medical Image Perception, ed. H. Kundel, Proceedings, 3016, 50-64, SPIE, Bellingham, WA Click to read more
PDF download  A. J. Ahumada, & B. L. Beard (1996) Object detection in a noisy scene, in B. Rogowitz and J. Allebach, eds., Human Vision, Visual Processing, and Digital Display VII, SPIE Proc. Vol. 2657 (paper 23), Bellingham, WA: SPIE. Click to read more
PDF download  A. J. Ahumada (1996) Simplified vision models for image quality assessment, SID International Symposium Digest of Technical Papers, Vol. 27, pp. 397-400, SID, Santa Ana, CA Click to read more
PDF download  A. M. Rohaly, A. J. Ahumada, & A. B. Watson (1995) A comparison of image quality models and metrics predicting object detection, in J. Morreale (Ed.), SID International Symposium Digest of Technical Papers (pp. 45-48). Santa Ana, CA: Society for Information Display Click to read more
PDF download  R. . Horng, & A. J. Ahumada (1995) A fast DCT block smoothing algorithm, Visual Communication and Image Processing Annual Meeting Proceedings, ed. Lance T. Wu, SPIE, 2501, Paper 5 Click to read more
A. J. Ahumada, & K. . Turano (1995) Calibration of a visual system with receptor drop-out, Exploratory Vision: The Active Eye, pp. 157-168, Springer-Verlag, New York Click to read more
PDF download  A. J. Ahumada, & K. . Turano (1995) The optimal motion stimulus, Vision Research, 35(3), 325-336 Click to read more
PDF download  A. B. Watson, J. A. Solomon, & A. J. Ahumada (1994) DCT basis function visibility: Effects of viewing distances and contrast masking, Proceedings, Human Vision, Visual Processing, and Digital Display IV, Bellingham, WA, SPIE, pp. 99-108 Click to read more
A. J. Ahumada, & R. . Horng (1994) De-blocking DCT compressed images, Human Vision, Visual Processing, and Digital Display V, SPIE Proc., 2179, pp. 109-116 Click to read more
PDF download  C. L. Tiana, M. . Pavel, & A. J. Ahumada (1994) Enhancing displays by blurring , Society for Information Display International Symposium Digest of Technical Papers, 25, 118-121. Santa Ana, CA Click to read more
PDF download  A. J. Ahumada, & R. . Horng (1994) Smoothing DCT compression artifacts, SID Digest, ed. J. Morreale, 25, 708-711 Click to read more
PDF download  A. B. Watson, J. A. Solomon, & A. J. Ahumada (1994) Visibility of DCT basis functions: Effects of contrast masking , Proceedings, Data Compression Conference, Snowbird, Utah, IEEE Computer Society Press, pp. 361-370 Click to read more
PDF download  A. B. Watson, J. A. Solomon, & A. J. Ahumada (1994) Visibility of DCT basis functions: Effects of display resolution, Proceedings, Data Compression Conference, Snowbird, Utah, IEEE Computer Society Press, pp. 371-379 Click to read more
PDF download  A. B. Watson, J. A. Solomon, A. . Gale, & A. J. Ahumada (1994) Visibility of DCT quantization noise: Effects of display resolution, Proceedings, Society for Information Display, San Jose, CA, Society for Information Display, pp. 697-700 Click to read more
H. A. Peterson, A. J. Ahumada, & A. B. Watson (1993) An improved detection model for DCT coefficient quantization, SPIE Proceedings, ed. B. Rogowitz and J. Allebach, 1913, 191-201 Click to read more
PDF download  A. J. Ahumada (1993) Computational image quality metrics: A review, Society for Information Display International Symposium Digest of Technical Papers, ed. J. Morreale, 24, 305-308. Santa Ana, CA Click to read more
PDF download  A. J. Ahumada, & C. H. Null (1993) Image quality: A multidimensional problem, In A.B. Watson (Ed.) Digital Images and Human Vision. Cambridge, MA: MIT Press Click to read more
PDF download  H. A. Peterson, A. J. Ahumada, & A. B. Watson (1993) The visibility of DCT quantization noise, Society for Information Display Digest of Technical Papers, 24, pp. 942-945 Click to read more
R. A. Martin, A. J. Ahumada, & J. . Larimer (1992) Color Matrix Display Simulation Based Upon Luminance and Chromatic Contrast Sensitivity of Early Vision, Human Vision, Visual Processing, and Digital Display III, ed. B. E. Rogowitz, Proceedings Volume 1666, pp. 336-342, SPIE, Bellingham, WA Click to read more
D. C. Foyle, A. J. Ahumada, J. . Larimer, & B. T. Sweet (1992) Enhanced/ synthetic vision systems: Human factors research and implications for future systems, SAE Transactions: Journal of Aerospace 101, 1734-1741 Click to read more
D. C. Foyle, A. J. Ahumada, J. . Larimer, & B. T. Sweet (1992) Enhanced/synthetic vision systems: Human factors research and implications for future systems, SAE Transactions: Journal of Aerospace, 101, 1734-1741 Click to read more
D. C. Foyle, A. J. Ahumada, J. . Larimer, & B. T. Sweet (1992) Enhanced/synthetic vision systems: Human factors research and implications for future systems, (Paper 921968). SAE SP-933: Conference Proceedings of the SAE Aerotech '92 Meeting, 59-66. SAE International: Warrendale, PA Click to read more
A. J. Ahumada, & C. H. Null (1992) Image quality: A multidimensional problem, Society for Information Display Digest (Paper 44-1) Click to read more
A. J. Ahumada (1992) Learning receptor positions, Computational Models of Visual Processing, ed. M. Landy and J. A. Movshon, pp.23-34, Cambridge, Massachusetts: MIT Press Click to read more
A. J. Ahumada, & H. A. Peterson (1992) Luminance-model-based DCT quantization for color image compression, SPIE Proceedings, 1666, 365-374 Click to read more
PDF download  J. B. Mulligan, & A. J. Ahumada (1992) Principled Halftoning Based On Human Vision Models, Proc. SPIE/SPSE Conference 1666 on Human Vision, Visual Processing, and Visual Display III, 109-121 Click to read more
PDF download  J. B. Mulligan, & A. J. Ahumada (1992) Principled Methods for Color Dithering Based on Models of the Human Visual System, SID Int. Symp. Dig. Tech. Papers, 23, 194-197 Click to read more
M. . Pavel, J. . Larimer, & A. J. Ahumada (1992) Sensor Fusion for Synthetic Vision, Society for Information Display Digest of Technical Papers, ed. J. Morreale, pp. 475 - 478, Society of Information Display, Playa Del Rey, CA Click to read more
PDF download  A. J. Ahumada, & J. B. Mulligan (1991) Network Compensation for Missing Sensors, Proc. SPIE/SPSE Conference 1453 on Human Vision, Visual Processing, and Visual Display II, 134-146 Click to read more
M. . Pavel, J. . Larimer, & A. J. Ahumada (1991) Sensor Fusion for Synthetic Vision, AIAA Computing in Aerospace 8: A Collection of Technical Papers, vol. CP9110-1, pp. 164-173, AIAA, Washington, DC Click to read more
A. J. Ahumada, & J. B. Mulligan (1990) Learning Networks for the Red-Green Opponent System, Tnv. Ophth. Vis. Sci. (suppl.), 31, 262 Click to read more
A. J. Ahumada, & J. B. Mulligan (1990) Learning Receptor Positions from Imperfectly Known Motions, Proc. SPIE/SPSE Conference No. 1249 on Human Vision, Visual Processing, and Visual Display, Paper No. 10, February 1990 Click to read more
A. B. Watson, & A. J. Ahumada (1989) A hexagonal orthogonal-oriented pyramid as a model of image representation in visual cortex, IEEE Transactions on Biomedical Engineering, 36(1), 97-106 Click to read more
L. T. Maloney, & A. J. Ahumada (1989) Learning by assertion: Two methods for calibrating a linear visual system, Neural Computation 1, 392-401 Click to read more
A. J. Ahumada, & J. B. Mulligan (1989) Learning In Interpolation Networks For Irregular Sampling: Some Convergence Properties, Topical Meeting on Applied Vision, 1989 Technical digest series, v. 16, (Optical Society of America, Washington, D.C. 1989) pp. WC3-1 - WC3-4 Click to read more
PDF download  A. J. Ahumada, & J. I. Yellott (1989) Reconstructing irregularly sampled images by neural networks, Conference on Human Vision, Visual Processing, and Digital Display, ed B. E. Rogowitz, Proc. Vol. 1077, pp. 228-235, SPIE, Bellingham, WA Click to read more
A. J. Ahumada, & A. B. Watson (1988) Simulation of Early Visual Processes, Proceedings Summer Computer Simulation Conference, ed. C. C. Barnett and W. M. Holmes, pp. 411-415, Society for Computer Simulation International, San Diego, California Click to read more
A. B. Watson, & A. J. Ahumada (1987) An orthogonal oriented quadrature hexagonal image pyramid, NASA Technical Memorandum 100054 Click to read more
A. J. Ahumada (1987) Cone Sampling Array Models, JOSA A 4, 1493-1502 Click to read more
A. J. Ahumada (1987) Putting the noise of the visual system back in the picture , JOSA A 4, 2372-237 Click to read more
PDF download  A. J. Ahumada (1987) Simulated Annealing in Networks for Computing Possible Arrangements for Red and Green Cones, IEEE First International Conference on Neural Networks, eds. M. Caudill and C. Butler, , Vol. IV, IEEE Service Center, Piscataway, New Jersey, 107-114 Click to read more
PDF download  A. B. Watson, K. . Nielsen, A. . Poirson, A. . Fitzhugh, A. . Bilson, K. . Nguyen, & A. J. Ahumada (1986) Use of a raster framebuffer in vision research, Behavioral Research Methods, Instrumentation and Computers 18, 587-594 Click to read more
A. B. Watson, A. J. Ahumada, & J. E. Farrell (1986) Window of visibility: Psychophysical theory of fidelity in time-sampled visual motion displays, Journal of the Optical Society of America A, 3(3), 300-307 Click to read more
K. . Nielsen, A. B. Watson, & A. J. Ahumada (1985) Application of a computable model of human spatial vision to phase discrimination, JOSA A 2, 1600-1606 Click to read more
A. J. Ahumada, & A. B. Watson (1985) Equivalent noise model for contrast detection and discrimination, JOSA A, 2, 1133-1139 Click to read more
PDF download  A. B. Watson, & A. J. Ahumada (1985) Model of human visual-motion sensing , Journal of the Optical Society of America A, 2(2), 322-342 Click to read more
A. B. Watson, & A. J. Ahumada (1983) A look at motion in the frequency domain, NASA Technical Memorandum 84352. Also published in J. K. Tsotsos (Ed.), Motion: Perception and representation (pp. 1-10). New York: Association for Computing Machinery Click to read more
A. J. Ahumada, D. C. Nagel, A. B. Watson, & J. I. Yellott (1983) Reduction of Display Artifacts by Random Sampling, Proceedings of the SPIE 432, 216-221 Click to read more
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Last Updated: May 19, 2020