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Transitions between chapters

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3-perception/vhar-textures/1-introduction.tex
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\section{Introduction}
\label{intro}
In the previous chapter, we investigated the role of the visual feedback of the virtual hand and the environment (\AR \vs \VR) on the perception of wearable haptic texture augmentation.
In this chapter, we explore the perception of wearable visuo-haptic texture augmentation of real surfaces touched directly with the finger in an immersive \AR context and without a virtual hand overlay.
When we look at the surface of an everyday object, we then touch it to confirm or contrast our initial visual impression and to estimate the properties of the object, particularly its texture (\secref[related_work]{visual_haptic_influence}).
Among the various haptic texture augmentations, data-driven methods allow to capture, model and reproduce the roughness perception of real surfaces when touched by a hand-held stylus (\secref[related_work]{texture_rendering}).
Databases of visuo-haptic textures have been developed in this way \cite{culbertson2014one,balasubramanian2024sens3}, but they have not yet been explored in an immersive and direct touch context with \AR and wearable haptics.