The Image Fidelity Assessor
C.C. Taylor, J.P. Allebach, and Z. Pizlo,
"The Image Fidelity Assessor," Proceedings of the 1998 IS&T
Image Processing, Image Quality, and Image Capture Systems Conference,
Portland, OR, 17-20 May 1998.
Abstract
In this paper we describe the Image Fidelity Assessor (IFA), a
model of the human visual system designed to evaluate perceived fidelity.
In particular, we describe the structure of the model, present results from
a contrast discrimination experiment used within the model, and demonstrate
preliminary results of the model. The IFA is designed to be both
physiologically and psychophysically plausible. It consists of a multichannel
Gabor pyramid decomposition. The fidelity at each spatial location within
each channel is evaluated based on psychometric functions. The psychometric
functions were determined experimentally and describe the discrimination
ability of the visual system as a function of spatial frequency, orientation,
and adaptation level.
Limited memory probability summation across the visual channels is used to
obtain a measure of perceived image fidelity. Preliminary results of the IFA
are consistent with human evaluation of image fidelity.
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