Learning to use illumination gradients as an unambiguous cue to three dimensional shape.

PloS One
Glen HardingMarina Bloj

Abstract

The luminance and colour gradients across an image are the result of complex interactions between object shape, material and illumination. Using such variations to infer object shape or surface colour is therefore a difficult problem for the visual system. We know that changes to the shape of an object can affect its perceived colour, and that shading gradients confer a sense of shape. Here we investigate if the visual system is able to effectively utilise these gradients as a cue to shape perception, even when additional cues are not available. We tested shape perception of a folded card object that contained illumination gradients in the form of shading and more subtle effects such as inter-reflections. Our results suggest that observers are able to use the gradients to make consistent shape judgements. In order to do this, observers must be given the opportunity to learn suitable assumptions about the lighting and scene. Using a variety of different training conditions, we demonstrate that learning can occur quickly and requires only coarse information. We also establish that learning does not deliver a trivial mapping between gradient and shape; rather learning leads to the acquisition of assumptions about lighting and scen...Continue Reading

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Citations

May 15, 2013·PloS One·You YangYue Gao
Feb 11, 2020·Journal of Vision·Ross Goutcher, Paul B Hibbard
Jan 30, 2014·PloS One·Maria Olkkonen, Sarah R Allred

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