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Communication Dans Un Congrès Année : 2015

A study of image exposure for the stereoscopic visualization of sparkling materials

Alexis Paljic

Résumé

This work is performed as part of the perceptual validation stage in the stereoscopic visualization of computer- generated (CG) images of materials —typically car paints— containing sparkling metallic flakes. The perceived material aspect is closely linked to the flake density, depth, and sparkling; in turn, our perception of an image of said materials is strongly dependent on the image exposure, that is, the amount of light entering the sensor during the imaging process. Indeed, a high exposure may over saturate the image, reducing discrimination amongst high-luminance flakes, affecting the perceived depth; on the other hand, a low exposure may reduce image contrast, merging low-luminance flakes with the background, and reducing perceived flake density and sparkling. In order to choose the right exposure for each CG image, we have performed a user study where we presented observers with a series of stereoscopic photographs of plates, taken at different exposures with a radiometrically color-calibrated camera, and asked them to assess each photograph’s similarity to a physical reference. We expect these results to help us find a correlation between optical settings and visual perception regarding the aforementioned parameters, which we could then use in the rendering process to obtain the desired material aspect.
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Dates et versions

hal-01256488 , version 1 (14-01-2016)

Identifiants

Citer

Medina Victor, Alexis Paljic, Dominique Lafon-Pham. A study of image exposure for the stereoscopic visualization of sparkling materials. IS&T/STIE Electronic Imaging 2015, International Society for Optics and Photonics, Feb 2015, San Francisco, United States. ⟨10.1117/12.2077681⟩. ⟨hal-01256488⟩
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