Effects of surface reflectance on local second order shape estimation in dynamic scenes
| Autor: | Maarten W. A. Wijntjes, Katja Doerschner, Ohad Ben-Shahar, Dicle N. Dövencioğlu |
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| Rok vydání: | 2015 |
| Předmět: |
Male
retina Computer science Motion Perception Geometric shape perception shape from motion human experiment 0302 clinical medicine Active shape model Specular highlight Computer vision stimulus response media_common surface reflectance 05 social sciences shape from specular flow Surface materials physical parameters Sensory Systems task performance priority journal Regression Analysis Shape from specular flow Female Shape analysis (digital geometry) Adult Surface Properties media_common.quotation_subject surface materials Optic Flow Curvature 050105 experimental psychology Article Judgment Young Adult 03 medical and health sciences Optics Perception Humans 0501 psychology and cognitive sciences Specular reflection human normal human local second order shape perception business.industry Models Theoretical Scale invariance Form Perception Ophthalmology Shape from motion visual system Artificial intelligence business Photic Stimulation 030217 neurology & neurosurgery |
| Zdroj: | Vision Research Vision Research, 2015; Corrected proof |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/j.visres.2015.01.008 |
| Popis: | In dynamic scenes, relative motion between the object, the observer, and/or the environment projects as dynamic visual information onto the retina (optic flow) that facilitates 3D shape perception. When the object is diffusely reflective, e.g. a matte painted surface, this optic flow is directly linked to object shape, a property found at the foundations of most traditional shape-from-motion (SfM) schemes. When the object is specular, the corresponding specular flow is related to shape curvature, a regime change that challenges the visual system to determine concurrently both the shape and the distortions of the (sometimes unknown) environment reflected from its surface. While human observers are able to judge the global 3D shape of most specular objects, shape-from-specular-flow (SFSF) is not veridical. In fact, recent studies have also shown systematic biases in the perceived motion of such objects. Here we focus on the perception of local shape from specular flow and compare it to that of matte-textured rotating objects. Observers judged local surface shape by adjusting a rotation and scale invariant shape index probe. Compared to shape judgments of static objects we find that object motion decreases intra-observer variability in local shape estimation. Moreover, object motion introduces systematic changes in perceived shape between matte-textured and specular conditions. Taken together, this study provides a new insight toward the contribution of motion and surface material to local shape perception. (C) 2015 The Authors. Published by Elsevier Ltd. |
| Databáze: | OpenAIRE |
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