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Issue No. 11 - Nov. (2016 vol. 22)
ISSN: 1077-2626
pp: 2423-2436
Georges Nader , Université de Lyon, LIRIS UMR 5205 CNRS, France
Kai Wang , CNRS and University Grenoble Alpes, GIPSA-Lab, Grenoble, France
Franck Hetroy-Wheeler , University Grenoble Alpes, LJK, Grenoble, France
Florent Dupont , Université de Lyon, LIRIS UMR 5205 CNRS, France
It is common that a 3D mesh undergoes some lossy operations (e.g., compression, watermarking and transmission through noisy channels), which can introduce geometric distortions as a change in vertex position. In most cases the end users of 3D meshes are human beings; therefore, it is important to evaluate the visibility of introduced vertex displacement. In this paper we present a model for computing a Just Noticeable Distortion (JND) profile for flat-shaded 3D meshes. The proposed model is based on an experimental study of the properties of the human visual system while observing a flat-shaded 3D mesh surface, in particular the contrast sensitivity function and contrast masking. We first define appropriate local perceptual properties on 3D meshes. We then detail the results of a series of psychophysical experiments where we have measured the threshold needed for a human observer to detect the change in vertex position. These results allow us to compute the JND profile for flat-shaded 3D meshes. The proposed JND model has been evaluated via a subjective experiment, and applied to guide 3D mesh simplification as well as to determine the optimal vertex coordinates quantization level for a 3D model.
Three-dimensional displays, Computational modeling, Visual systems, Distortion, Sensitivity, Visualization, Solid modeling

G. Nader, K. Wang, F. Hetroy-Wheeler and F. Dupont, "Just Noticeable Distortion Profile for Flat-Shaded 3D Mesh Surfaces," in IEEE Transactions on Visualization & Computer Graphics, vol. 22, no. 11, pp. 2423-2436, 2016.
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