Predicting human vision perception and perceptual difference
AssigneeTektronix, Inc.
InventorKevin M. Ferguson
Life of this patent
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Abstract
An apparatus and method for predicting human vision perception and perceptual differences provides a perceptual difference model that merges two human vision systems, one for a reference video signal and the other for an impaired version of the reference video signal. The respective video signals are processed by spatio-temporal filters and, prior to differencing, by noise masking modules that apply a noise mask as a function of pupil size and luminance. The differenced filtered signal is an initial perceptual difference map to which other masking is applied to take into account correlation and contrast gain based upon the noise masks and filtered luminance from the spatio-temporal filters. The result is a more precise output perceptual difference map.
Claims13
A perceptual difference model using a pair of human vision systems, one for a reference video signal and the other for an impaired version of the reference video signal, each human vision system having a spatio-temporal filter receiving the respective video signal, the outputs of which are differenced to obtain an initial perceptual difference map, further comprising means for noise masking the output of each spatio-temporal filter to account for photon noise based on the relation of pupil size to luminance prior to obtaining the initial perceptual difference map.
A perceptual difference model using a pair of human vision systems, one for a reference video signal and the other for an impaired version of the reference video signal, each human vision system having a spatio-temporal filter receiving the respective video signal, the outputs of which are differenced to obtain an initial perceptual difference map, further comprising means for otherwise masking the initial perceptual difference map as a function of the outputs of the spatio-temporal filters and filtered luminance outputs from the spatio-temporal filters to account for correlation and contrast gain control to produce an output perceptual difference map from the initial perceptual difference map.
A method of generating an output perceptual difference map from a reference video signal and an impaired version of the reference video signal using a perceptual difference model that merges a pair of human vision systems, one for the reference video signal and the other for the impaired video signal, each human vision system having a spatio-temporal filter receiving the respective video signal, the outputs of which are differenced to obtain an initial perceptual difference map, further comprising the step of noise masking the output of each spatio-temporal filter to account for photon noise based on the relation of pupil size to luminance prior to obtaining the initial perceptual difference map as the output perceptual difference map.
A method of generating an output perceptual difference map from a reference video signal and an impaired version of the reference video signal using a perceptual difference model that merges a pair of human vision systems, one for the reference video signal and the other for the impaired video signal, each human vision system having a spatio-temporal filter receiving the respective video signal, the outputs of which are differenced to obtain an initial perceptual difference map, further comprising the step of otherwise masking the initial perceptual difference map as a function of the outputs of the spatio-temporal filters and filtered luminance outputs from the spatio-temporal filters to account for correlation and contrast gain control to produce the output perceptual difference map from the initial perceptual difference map.
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