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Andrew B. Watson
Researcher at Ames Research Center
Publications - 151
Citations - 16135
Andrew B. Watson is an academic researcher from Ames Research Center. The author has contributed to research in topics: Spatial frequency & Discrete cosine transform. The author has an hindex of 56, co-authored 151 publications receiving 15473 citations. Previous affiliations of Andrew B. Watson include University of Pennsylvania & Stanford University.
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Journal ArticleDOI
QUEST: a Bayesian adaptive psychometric method.
TL;DR: An adaptive psychometric procedure that places each trial at the current most probable Bayesian estimate of threshold is described, taking advantage of the common finding that the human psychometric function is invariant in form when expressed as a function of log intensity.
Journal ArticleDOI
Model of human visual-motion sensing
TL;DR: A model of how humans sense the velocity of moving images, using a set of spatial-frequency-tuned, direction-selective linear sensors, agrees qualitatively with human perception.
Proceedings ArticleDOI
DCT quantization matrices visually optimized for individual images
TL;DR: Here I show how to compute a matrix that is optimized for a particular image, and custom matrices for a number of images show clear improvement over image-independent matrices.
Journal ArticleDOI
Visibility of wavelet quantization noise
TL;DR: A mathematical model is constructed for DWT noise detection thresholds that is a function of level, orientation, and display visual resolution that allows calculation of a "perceptually lossless" quantization matrix for which all errors are in theory below the visual threshold.
Journal ArticleDOI
Probability summation over time.
TL;DR: Frequency-of-seeing and sensitivity-duration curves were collected for temporal signals of limited spectral extent and suggest that a stimulus is detected whenever the excursions of its linearly filtered, noise-perturbed temporal waveform exceed some fixed magnitude.