• Appearance Manipulation in Spatial Augmented Reality using Image Differences 

      Gigilashvili, Davit; Trumpy, Giorgio (Peer reviewed; Journal article, 2022)
      Rapidly emerging augmented reality technologies enable us to virtually alter appearance of objects and materials in a fast and efficient way. The state-of-the-art research shows that the human visual system has a poor ...
    • Behavioral Investigation of Visual Appearance Assessment 

      Gigilashvili, Davit; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Pedersen, Marius (Journal article; Peer reviewed, 2018)
      The way people judge, assess and express appearance they perceive can dramatically vary from person to person. The objective of this study is to identify the research hypotheses and outline directions for the future work ...
    • Blurring Impairs Translucency Perception 

      Gigilashvili, Davit; Pedersen, Marius; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      Translucency and factors impacting its perception is not yet fully understood. Various studies have examined the correlation between physical material properties and perceived translucency. Furthermore, the concept of ...
    • Can image cues explain the impact of translucency on perceived gloss? 

      Gigilashvili, Davit; Jayed Islam, Akib (Peer reviewed; Journal article, 2023)
      Gloss perception is a complex psychovisual phenomenon, whose mechanisms are not yet fully explained. Instrumentally measured surface reflectance is usually poor predictor of human perception of gloss. The state-of-the-art ...
    • Can we grasp the color of translucent objects? 

      Gigilashvili, Davit; Chowdhury, Dipayan; Hardeberg, Jon Yngve (Journal article, 2024)
      While colorimetry is traditionally measuring point colors, there is an increasing need to quantify colors of 3D objects in real-world scenes. 3D objects, especially translucent ones, exhibit high spatio-temporal variation ...
    • Caustics and Translucency Perception 

      Gigilashvili, Davit; Dubouchet, Lucas; Hardeberg, Jon Yngve; Pedersen, Marius (Peer reviewed; Journal article, 2020)
      Caustics projected onto the surface carry very interesting information regarding the material they are cast by. It has been observed in previous studies that caustics could be a widely used cue for translucency assessment ...
    • Color Naming and Communication of Color Appearance: Is it Different for Native Georgian Speakers? 

      Amirkhanashvili, Ana; Gigilashvili, Davit (Peer reviewed; Journal article, 2020)
      Color is one of the most prominent appearance attributes. The terms used by humans to communicate color appearance and to set categorical boundaries in the color space have long been a point of scholarly interest. Two ...
    • COLOR NAMING AND CONSTANCY OF 3D TRANSLUCENT OBJECTS 

      Gigilashvili, Davit; Amirkhanashvili, Ana (Journal article, 2023)
      A large body of research on color constancy and naming of colors is based on flat homogeneous patches. Even though recent studies highlight the importance of studying color in context of 3D objects and scenes, they usually ...
    • Computational techniques for virtual reconstruction of fragmented archaeological textiles 

      Gigilashvili, Davit; Lukesova, Hana; Gulbrandsen, Casper Fabian; Harijan, Akash; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2023)
      Archaeological artifacts play important role in understanding the past developments of the humanity. However, the artifacts are often highly fragmented and degraded, with many details and parts missing due to centuries’ ...
    • Criteria for matching fragmented archaeological textiles: a survey 

      Gigilashvili, Davit; Lukesova, Hana; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2024)
      Archaeological textiles are a valuable source for understanding past cultures. However, textiles are vulnerable to decomposition and often found in a fragmentary state. Textile experts rely on their eyes and experience for ...
    • Does Higher Refractive Index Mean Higher Gloss? 

      Gigilashvili, Davit; Diaz Estrada, David Norman (Journal article, 2024)
      According to Fresnel equations, the amount of specular reflection at the dielectric surface depends on two factors: incident angle and the difference in refractive indices of inner and outer media. Therefore, it is often ...
    • Does Motion Increase Perceived Magnitude of Translucency? 

      Gigilashvili, Davit; Diaz Estrada, David Norman; Lakshay, Jain (Peer reviewed; Journal article, 2023)
      The visual mechanisms behind our ability to distinguish translucent and opaque materials is not fully understood. Disentanglement of the contributions of surface reflectance and subsurface light transport to the still image ...
    • Efficient and user-friendly visualization of neural relightable images for cultural heritage applications 

      Righetto, Leonardo; Khademizadeh, Mohammad; Giachetti, Andrea; Ponchio, Federico; Gigilashvili, Davit; Bettio, Fabio; Gobbetti, Enrico (Journal article; Peer reviewed, 2024)
      We introduce an innovative multi-resolution framework for encoding and interactively visualizing large relightable images using a neural reflectance model derived from a state-of-the-art technique. The framework is seamlessly ...
    • Exploring the role of caustics in translucency perception — An eye tracking approach 

      Gigilashvili, Davit; Sole, Aditya Suneel; Nath, Shaikat Deb; Pedersen, Marius (Peer reviewed; Journal article, 2022)
      Translucency is an important appearance attribute. The caustic patterns that are cast by translucent objects onto another surface encapsulate information about subsurface light transport properties of a material. A previous ...
    • Illuminance Impacts Opacity Perception of Textile Materials 

      Gigilashvili, Davit; Mirjalili, Fereshteh; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2019)
      Opacity is an important appearance attribute in the textile industry. Obscuring power and the way textile samples block light can define product quality and customer satisfaction in the lingerie, shirting, and curtain ...
    • Image Statistics as Glossiness and Translucency Predictor in Photographs of Real-world Objects 

      Gigilashvili, Davit; Tanaka, Midori; Pedersen, Marius; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2020)
      We interpret our surrounding based on the visual stimuli, and perceive objects and materials around us to have various attributes, like color, glossiness, and translucency. We analyze the three-dimensional world based on ...
    • The Impact of Optical and Geometrical Thickness on Perceived Translucency Differences 

      Gigilashvili, Davit; Urban, Philipp; Thomas, Jean Baptiste; Pedersen, Marius; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)
      In this work we study the perception of suprathreshold translucency differences to expand the knowledge about material appearance perception in imaging and computer graphics, and 3D printing applications. Translucency is ...
    • Impact of Shape on Apparent Translucency Differences 

      Gigilashvili, Davit; Urban, Philipp; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Pedersen, Marius (Journal article; Peer reviewed, 2019)
      Translucency is one of the major appearance attributes. Apparent translucency is impacted by various factors including object shape and geometry. Despite general proposals that object shape and geometry have a significant ...
    • The Importance of Object-to-Background Distance when Evaluating Perceived Transmittance 

      Ahmed, Rafique; Gigilashvili, Davit (Journal article; Peer reviewed, 2024)
      Transparent and translucent objects transmit part of the incident radiant flux permitting a viewer to see the background through them. Perceived transmittance and how the human visual system assigns transmittance to flat ...
    • Material Appearance: Ordering and Clustering 

      Gigilashvili, Davit; Thomas, Jean-Baptiste; Pedersen, Marius; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2019)
      Appearance is a complex psychovisual phenomenon impacted by various objective and subjective factors that are not yet fully understood. In this work we use real objects and unconstrained conditions to study appearance ...