Digital Transmission of Subjective Material Appearance

In: Journal of WSCG (June 2017), 25:2(57-66)
 

Abstract

The digital recreation of real-world materials has a substantial role in applications such as product design, on-line shopping or video games. Since decisions in design or shopping are often driven by qualities like “softness” or “beautifulness” of a material (rather than its photo-accurate visual depiction), a digital material should not only closely capture the texture and reflectance of the physical sample, but also its subjective feel. Computer graphics research constantly struggles to trade physical accuracy against computational efficiency. However, the connection between measurable visual properties of a material on its perceived quality is subtle and hard to quantify. Here, we analyze the capability of a state-of-the-art model for digital material appearance (the spatially-varying BRDF) to transport certain subjective qualities through the visual channel. In a psychophysical study, we presented users with measured material SVBRDFs in the form of rendered still images and animations, as well as photographs and physical samples of the original materials. The main insight from this experiment is that photographs reproduce better those qualities associated with the sense of touch, particularly for textile materials. We hypothesized that the abstraction of volumetric materials as opaque and flat textures destroys important visual cues especially in border regions, where fluff and protruding fibers are most prominent. We therefore performed a follow-up experiment where the border regions have been removed from the photographs. The fact that this step greatly reduced the capability of photos to transport important qualities suggests strong directions of future research in applied perception and computer graphics.

Keywords: Digital Material Appearance, Material perception, SVBRDF, visual psychophysics

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Bibtex

@ARTICLE{Martin2017,
    author = {Mart{\'i}n, Rodrigo and Weinmann, Michael and Hullin, Matthias B.},
     pages = {57--66},
     title = {Digital Transmission of Subjective Material Appearance},
   journal = {Journal of WSCG},
    volume = {25},
    number = {2},
      year = {2017},
     month = jun,
  keywords = {Digital Material Appearance, Material perception, SVBRDF, visual psychophysics},
  abstract = {The digital recreation of real-world materials has a substantial role in applications such as
              product design, on-line shopping or video games. Since decisions in design or shopping are often
              driven by qualities like “softness” or “beautifulness” of a material (rather than its
              photo-accurate visual depiction), a digital material should not only closely capture the texture and
              reflectance of the physical sample, but also its subjective feel. Computer graphics research
              constantly struggles to trade physical accuracy against computational efficiency. However, the
              connection between measurable visual properties of a material on its perceived quality is subtle and
              hard to quantify. Here, we analyze the capability of a state-of-the-art model for digital material
              appearance (the spatially-varying BRDF) to transport certain subjective qualities through the visual
              channel. In a psychophysical study, we presented users with measured material SVBRDFs in the form of
              rendered still images and animations, as well as photographs and physical samples of the original
              materials. The main insight from this experiment is that photographs reproduce better those
              qualities associated with the sense of touch, particularly for textile materials. We hypothesized
              that the abstraction of volumetric materials as opaque and flat textures destroys important visual
              cues especially in border regions, where fluff and protruding fibers are most prominent. We
              therefore performed a follow-up experiment where the border regions have been removed from the
              photographs. The fact that this step greatly reduced the capability of photos to transport important
              qualities suggests strong directions of future research in applied perception and computer graphics.},
      issn = {1213-6972},
       url = {http://wscg.zcu.cz/WSCG2017/!_2017_Journal_WSCG-No-2.pdf}
}