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Conference Paper

Using Multidimensional Scaling to Quantify the Fidelity of Haptic Rendering of Deformable Objects

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons83865

Cooke,  T
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83906

Ernst,  MO
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Leskovsky, P., Cooke, T., Ernst, M., & Harders, M. (2006). Using Multidimensional Scaling to Quantify the Fidelity of Haptic Rendering of Deformable Objects. In EuroHaptics International Conference (EH 2006) (pp. 289-295). Paris, France: ANY PUBLISHER.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-D0FD-0
Abstract
In this paper, we examine the application of a psychophysical evaluation technique to quantify the fidelity of haptic rendering methods. The technique is based on multidimensional scaling (MDS) analysis of similarity ratings provided by users comparing pairs of haptically-presented objects. Unbeknownst to the participants, both real and virtual deformable objects were presented to them. In addition, virtual objects were either presented under higher-fidelity rendering condition or under lower-fidelity condition in which force filtering and proxy-point filtering were removed. We hypothesized that reducing fidelity of virtual rendering would exaggerate the difference between real and virtual objects. MDS analysis of pairwise similarity data provided quantitative confirmation that users perceived a clear difference between real and virtual objects in the lower-fidelity, but not in the higher-fidelity condition. In the latter, a single perceptual dimension, corresponding to stiffness, sufficed to explain similarity data, while two perceptual dimensions were needed in the former condition. This study demonstrates how MDS analysis provides an opportunity to visualize and quantify the perceptual effects of changes in rendering parameters and how it can be used in the evaluation of haptic rendering scenarios.