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Determining 3D Flow Fields via Multi-camera Light Field Imaging
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The visual light field in real scenes.

Ling Xia1, Sylvia C Pont1, Ingrid Heynderickx2

  • 1π-lab (Perceptual Intelligence lab), Department of Industrial Design, Delft University of Technology, Delft, The Netherlands;

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Summary
This summary is machine-generated.

Human observers can perceive illumination properties in real scenes, not just on screens. Textured surfaces significantly improve detecting lighting mismatches, enhancing visual light field perception.

Keywords:
3D texturediffusenessdirectionintensityprobing methodswap effect

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Area of Science:

  • Perception science
  • Computer vision
  • Experimental psychology

Background:

  • Human ability to infer the light field in empty space is termed the visual light field.
  • Most studies on the visual light field use computer screens, limiting real-world applicability.

Purpose of the Study:

  • Investigate the visual light field in a real scene using a novel experimental setup.
  • Determine if 3D texture cues on probes enhance detection of illumination mismatches.
  • Analyze the influence of illumination intensity, direction, and diffuseness on human perception.

Main Methods:

  • Optically mixed a 'probe' and a scene using a semitransparent mirror.
  • Twenty participants judged probe-scene fit regarding illumination.
  • Compared smooth and rough probes to assess the impact of 3D texture.

Main Results:

  • Confirmed human sensitivity to illumination intensity, direction, and diffuseness in real scenes.
  • Observed a 'swap effect' where perceived fit depended on scene-probe illumination assignments.
  • Rough probes significantly improved detection of lighting diffuseness and direction mismatches.

Conclusions:

  • Human visual perception of light fields extends to real-world environments.
  • 3D surface texture provides crucial cues for judging illumination direction and diffuseness.
  • The 'swap effect' highlights the complex interplay between object luminance and perceived lighting consistency.