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Erwan Normand
2024-10-18 15:10:09 +02:00
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1-background/related-work/4-visuo-haptic-ar.tex
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@@ -109,8 +109,8 @@ Adding a visual delay increased the perceived stiffness of the reference piston,
\begin{subfigs}{visuo-haptic-stiffness}{
Perception of haptic stiffness in \VST-\AR \cite{knorlein2009influence}.
}[][
\item Participant pressing a virtual piston rendered by a force-feedback device with their hand.
\item Proportion of comparison piston perceived as stiffer than reference piston (vertical axis) as a function of the comparison stiffness (horizontal axis) and visual and haptic delays of the reference (colors).
\item Participant pressing a virtual piston rendered by a force-feedback device.
\item Proportion of comparison piston perceived as stiffer than reference piston (vertical axis) as a function of the comparison stiffness (horizontal axis) and visual-haptic delays of the reference (colors).
]
\subfigbox[.44]{knorlein2009influence_1}
\subfig[.55]{knorlein2009influence_2}
@@ -129,16 +129,6 @@ The reference piston was judged to be stiffer when seen in \VR than in \AR, with
This suggests that the haptic stiffness of virtual objects feels \enquote{softer} in an augmented environment than in a full \VE.
%Two differences that could be worth investigating with the two previous studies are the type of \AR (visuo or optical) and to see the hand touching the virtual object.
\begin{subfigs}{gaffary2017ar}{Perception of haptic stiffness in \OST-\AR \vs \VR \cite{gaffary2017ar}. }[][
\item Experimental setup: a virtual piston was pressed with a force-feedback placed to the side of the participant.
\item View of the virtual piston seen in front of the participant in \OST-\AR and
\item in \VR.
]
\subfig[0.35]{gaffary2017ar_1}
\subfigbox[0.31]{gaffary2017ar_3}
\subfigbox[0.31]{gaffary2017ar_4}
\end{subfigs}
Finally, \textcite{diluca2019perceptual} investigated the perceived simultaneity of visuo-haptic contact with a virtual object in \VR.
The contact was rendered both by a vibrotactile piezoelectric device on the fingertip and by a visual change in the color of the virtual object.
The visuo-haptic simultaneity was varied by adding a visual delay or by triggering the haptic feedback earlier.
@@ -147,6 +137,16 @@ No participant (out of 19) was able to detect a \qty{50}{\ms} visual lag and a \
These studies have shown how the latency of the visual rendering of a virtual object or the type of environment (\VE or \RE) can affect the perceived haptic stiffness of the object, rendered with a grounded force-feedback device.
We describe in the next section how wearable haptics have been integrated with immersive \AR.
\begin{subfigs}{gaffary2017ar}{Perception of haptic stiffness in \OST-\AR \vs \VR \cite{gaffary2017ar}. }[][
\item Experimental setup: a virtual piston was pressed with a force-feedback placed to the side of the participant.
\item View of the virtual piston seen in front of the participant in \OST-\AR.
\item The same view but in \VR.
]
\subfig[0.35]{gaffary2017ar_1}
\subfigbox[0.31]{gaffary2017ar_3}
\subfigbox[0.31]{gaffary2017ar_4}
\end{subfigs}
\subsection{Wearable Haptics for Direct Hand Interaction in AR}
\label{vhar_haptics}