The Spatial Standard Observer is a method for computing the perceptual difference between two digital images, or the perceptual magnitude of a single image.

Write to the developer if you are interested. US Patent pending.

The following are presentations and articles related to the Spatial Standard Observer.

Watson, A. B., & Ahumada, A. J., Jr. (2005). Spatial Standard Observer for Visual Technology. Paper presented at the IEEE International Conference on Systems, Man, and Cybernetics (SMC).

Watson, A. B., & Ahumada, A. J., Jr. (2005). Predicting acuity from the Spatial Standard Observer. Invest Ophthalmol Vis Sci., 46, ARVO E-Abstract 3614.

Watson, A. B. (2005). A spatial standard observer for vision technology. Proceedings of the SPIE-IS&T Electronic Imaging, 5666, 1-3.

Watson, A. B. (2005). UAV See and Avoid Systems: Modeling Human Visual Detection and Identification (Report to Federal Aviation Administration). Moffett Field, California: NASA Ames Research Center.

Ahumada, A. J., Jr., & Watson, A. B. (2004). A spatial standard observer based on contrast energy. Investigative Ophthalmology & Visual Science, 45.

Watson, A. B., & Ahumada, A. J., Jr. (2004). Human optical image quality and the spatial standard observer. Journal of Vision, 4(11), 2a, http://journalofvision.org/4/11/2/.

Watson, A. B., & Ahumada, A. J., Jr. (2004). The Spatial Standard Observer. Journal of Vision, 4(8), 51a, http://journalofvision.org/4/8/51/.

Watson, A. B., & Ahumada, A. J., Jr. (2004, 5/25/2004). The Spatial Standard Observer as a tool for design of UAV viewing systems. Paper presented at the Human Factors of Unmanned Aerial Vehicles, Chandler, AZ.

Wuerger, S., Watson, A. B., & Ahumada, A. J., Jr. (2002). Toward a standard observer for spatio-chromatic detection. Proceedings of the SPIE, 4662(19), 159-172.

Watson, A. B., & Ramirez, C. V. (2000). A Standard Observer for spatial vision. Investigative Ophthalmology and Visual science, 41(4), S713, http://vision.arc.nasa.gov/publications/watson_arvo2000.pdf.

Watson, A. B. (2000). Spatial standard observer (NASA Disclosure of Invention). Moffett Field, CA: NASA Ames Research Center.