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

Abstract : 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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Submitted on : Thursday, January 14, 2016 - 9:08:21 PM
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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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