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Complete vhar_system conclusion

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Erwan Normand
2024-10-01 11:18:32 +02:00
parent 53a45d62a7
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2-perception/vhar-system/2-method.tex
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@@ -35,15 +35,6 @@ The system consists of three main components: the pose estimation of the tracked
\subsection{Pose Estimation}
\label{pose_estimation}
\begin{subfigs}{setup}{Visuo-haptic texture rendering system setup. }[][
\item HapCoil-One voice-coil actuator with a fiducial marker on top attached to the middle-phalanx of the user's index finger.
]
\subfig[0.325]{device}
%\subfig[0.65]{headset}
%\par\vspace{2.5pt}
%\subfig[0.992]{apparatus}
\end{subfigs}
A \qty{2}{\cm} AprilTag fiducial marker \cite{wang2016apriltag} is glued to the top of the actuator (\figref{device}) to track the finger pose with a camera (StreamCam, Logitech) which is placed above the experimental setup and capturing \qtyproduct{1280 x 720}{px} images at \qty{60}{\hertz} (\figref{apparatus}).
Other markers are placed on the tangible surfaces to augment (\figref{setup}) to estimate the relative position of the finger with respect to the surfaces.
Contrary to similar work using vision-based tracking allows both to free the hand movements and to augment any tangible surface.
@@ -72,7 +63,7 @@ A \VST-\AR or a \VR headset could have been used as well.
\subsection{Vibrotactile Signal Generation and Rendering}
\label{texture_generation}
A voice-coil actuator (HapCoil-One, Actronika) is used to display the vibrotactile signal, as it allows the frequency and amplitude of the signal to be controlled independently over time, covers a wide frequency range (\qtyrange{10}{1000}{\Hz}), and outputs the signal accurately with relatively low acceleration distortion\footnote{HapCoil-One specific characteristics are described in its data sheet: \url{https://web.archive.org/web/20240228161416/https://tactilelabs.com/wp-content/uploads/2023/11/HapCoil_One_datasheet.pdf}}.
A voice-coil actuator (HapCoil-One, Actronika) is used to display the vibrotactile signal, as it allows the frequency and amplitude of the signal to be controlled independently over time, covers a wide frequency range (\qtyrange{10}{1000}{\Hz}), and outputs the signal accurately with relatively low acceleration distortion\footnote{HapCoil-One specific characteristics are described in its data sheet: \url{https://tactilelabs.com/wp-content/uploads/2023/11/HapCoil_One_datasheet.pdf}}.
The voice-coil actuator is encased in a \ThreeD printed plastic shell and firmly attached to the middle phalanx of the user's index finger with a Velcro strap, to enable the fingertip to directly touch the environment (\figref{device}).
The actuator is driven by a class D audio amplifier (XY-502 / TPA3116D2, Texas Instrument). %, which has proven to be an effective type of amplifier for driving moving-coil \cite{mcmahan2014dynamic}.
The amplifier is connected to the audio output of a computer that generates the signal using the WASAPI driver in exclusive mode and the NAudio library\footnoteurl{https://github.com/naudio/NAudio}.