User Model for Predictive Calibration Control on Interactive Screens

Abstract

Abstract-On interactive surfaces, a precise calibration of the tracking system is necessary for an exact user interaction. So far, common calibration techniques focus on eliminating geometric distortions. This static calibration is only correct for a specific viewpoint of one single user and parallax error distortions still occur if this changes (i.e. if the user moves in front of the digital screen).In order to overcome this problem, we present an empirical model of the user's position and movement in front of a digital screen. With this, a model predictive controller is able to correct the parallax error for future positions of the user. We deduce the model's parameters from a user study on a large interactive whiteboard, in which we measured the 3D position of the user's viewpoint during common interaction tasks.

Interaction Prediction for Content Synchronization of Net-based Shared Workspaces

“…The results confirm the findings in [4]. They showed that the user interacts mainly in the left partition of the screen in office environments.…”

“…We deduce a model for predicting the user's next interaction area from a user study on two synchronized large interactive stations. The results show that the interaction position is not -as initially assumed -simply Gaussian distributed around the last interaction position, since it depends on the use case as also proposed in [4].…”

“…In the context of overcoming the parallax error on interactive screens [12], Migge et al present a Markovian model to predict the user's position in front of large interactive screens between interactions [4]. They presented an interaction position model for single user office applications [4].…”

EyePACT

“…In contrast to the aforementioned types of parallax, we focus on the parallax error induced by large distances between the touchscreen and the display, which results in a displacement between the perceived and detected touch point on a touch-enabled public display. This was previously referred to as "parallax error" [28] or "visual parallax" [24]. Parallax was a major issue in touch-based interaction in the early days of touchscreens [34].…”

An interactive whiteboard for immersive telecollaboration

“…Thus, the overlay's glass pane is in a certain distance to the matrix of the LC-screen. This results in a noticeable parallax distortion, which has a significant impact on the interaction precision of the user [18]. Small objects (targets) cannot be hit easily and the user has to continuously correct the position during his interaction.…”