48 lines
3.3 KiB
TeX
48 lines
3.3 KiB
TeX
\section{Hand-Object Interactions in Visuo-Haptic Augmented Reality}
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\label{visuo_haptic_ar}
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% Answer the following four questions: “Who else has done work with relevance to this work of yours? What did they do? What did they find? And how is your work here different?”
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\subsection{Altering the Perceptions}
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\label{vhar_perception}
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\subsubsection{Influence of Visual Rendering on Haptic Perception}
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\label{vhar_influences}
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When the same object property is sensed simultaneously by vision and touch, the two modalities are integrated into a single perception.
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The phychophysical model of \textcite{ernst2002humans} established that the sense with the least variability dominates perception.
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\subsubsection{Contact \& Hardness Augmentations}
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\label{vhar_hardness}
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\subsubsection{Texture Augmentations}
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\label{vhar_texture}
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Particularly for real textures, it is known that both touch and sight individually perceive textures equally well and similarly~\autocite{bergmanntiest2007haptic,baumgartner2013visual,vardar2019fingertip}.
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Thus, the overall perception can be modified by changing one of the modalities, as shown by \textcite{yanagisawa2015effects}, who altered the perception of roughness, stiffness and friction of some real tactile textures touched by the finger by superimposing different real visual textures using a half-mirror.
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In 2010, they were research interest on building haptics (dynamic tactile feedback) for touch-based systems. [@Bau2010Teslatouch] created a touch-based surface rendering textures using electrovibration and friction feedback between the surface and the user's finger.
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They extended this prototype to in [@Bau2012REVEL] to alter the texture of touched real objects using reverse electrovibration. They call this kind of haptic devices that can alter the touch perception of any object without any setup as *intrinsic haptic displays*. They said [@Azuma1997Survey] as envisioned this kind of AR experience.
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Similarly but in VR, \textcite{degraen2019enhancing} combined visual textures with different passive haptic hair-like structure that were touched with the finger to induce a larger set of visuo-haptic materials perception.
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\textcite{gunther2022smooth} studied in a complementary way how the visual rendering of a virtual object touching the arm with a tangible object influenced the perception of roughness.
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Likewise, visual textures were combined in VR with various tangible objects to induce a larger set of visuo-haptic material perceptions, in both active touch~\autocite{degraen2019enhancing} and passive touch~\autocite{gunther2022smooth} contexts.
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A common finding of these studies is that haptic sensations seem to dominate the perception of roughness, suggesting that a smaller set of haptic textures can support a larger set of visual textures.
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\subsection{Improving the Interactions}
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\label{vhar_interaction}
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Conversely, virtual hand rendering is also known to influence how an object is grasped in VR~\autocite{prachyabrued2014visual,blaga2020too} and AR, or even how real bumps and holes are perceived in VR~\autocite{schwind2018touch}, but its effect on the perception of a haptic texture augmentation has not yet been investigated.
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\subsubsection{Virtual Hands in Augmented Reality}
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\label{vhar_hands}
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\subsubsection{Wearable Haptics for Augmented Reality}
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\label{vhar_haptics}
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