From: Thomas Pietrzak Date: Fri, 3 Dec 2021 07:59:03 +0000 (+0100) Subject: Corrections face expressions X-Git-Tag: first-full-draft~79 X-Git-Url: https://git.thomaspietrzak.com/?a=commitdiff_plain;h=d843f9df4eae22a9dce6bde6ac53ae7ffd5f3901;p=hdr.git Corrections face expressions --- diff --git a/tex/3-input.tex b/tex/3-input.tex index b5e28b2..a7820b3 100644 --- a/tex/3-input.tex +++ b/tex/3-input.tex @@ -806,7 +806,7 @@ Moreover, users cannot give their avatar a different expression than their own. Therefore we investigated the non-isomorphic control of face expressions, with interaction techniques \cite{baloup21}. The fine control of face expressions requires many degrees of freedom. -The FACS standard defines 24 Action Units \cite{ekman78}, and the MPEG-4 proposes 68 Facial Animation Parameters\cite{pandzic03}. +For example, the FACS standard defines 24 Action Units \cite{ekman78}, and the MPEG-4 proposes 68 Facial Animation Parameters\cite{pandzic03}. Therefore we propose to reduce the number of degrees of freedom by decomposing the selection of a face expression into several sub-tasks, similarly to Bowman's decomposition of 3D interaction tasks \cite{bowman04}. The sub-tasks are: selecting a face expression, its intensity, duration, and ending. The selection consists in choosing a face expression among a list of pre-defined expressions. @@ -842,7 +842,7 @@ Similarly to command selection, some of the face expressions share properties, w The visual representation of face expressions in our techniques use emojis. We made this choice because they are frequently used in messaging and social networks. -Also, people can identify them even with a small size. +Also, people can identify them even small versions of them. %Some of them represent emotions. If we restrict face expressions corresponding to emotions, we can leverage models of emotions such as PAD \cite{mehrabian96} or Plutchik's wheel of emotions \cite{plutchik01}. The layout of our pie menu selection technique is adapted from Plutchik's wheel, which organizes emotions along 8 axes representing 8 base emotions. @@ -867,7 +867,7 @@ The third technique is similar, users must roll the controller and the intensity The fourth technique creates a visible elastic band between the selected expression and the selection ray. The intensity is mapped to the length of the elastic band. This technique requires a ray to which the elastic band is attached, therefore it cannot be used with a subset ot the face expression selection techniques. -The last technique only work with pie menu techniques, and map the intensity to the distance to the center of the menu. +The last technique only works with pie menu techniques, and maps the intensity to the distance to the center of the menu. Our evaluations show a subjective preference of the elastic band, trigger, and orientation techniques over the shake technique. We evaluated the usability of the pie menu with a raycasting selection and an intensity control with the elastic band.