Imperceptible Calibration for Radiometric Compensation

We present a novel multi-step technique for imperceptible geometry and radiometry calibration of projector-camera systems. Our approach can be used to display geometry and color corrected images on non-optimized surfaces at interactive rates while simultaneously performing a series of invisible structured light projections during runtime. It supports disjoint projector-camera configurations, fast and progressive improvements, as well as real-time correction rates of arbitrary graphical content. The calibration is automatically triggered when mis-registrations between camera, projector and surface are detected

Erwerbsminderung - ein erhebliches Armutsrisiko: empirische Befunde zur sozioökonomischen Situation von Personen mit Erwerbsminderung

Laut einer aktuellen Umfrage von Infratest Dimap für den ARD-Deutschland Trend befürchtet rund ein Drittel der Erwerbstätigen, im Alter arm zu sein. Auch für das Bundesministerium für Arbeit und Soziales ist die Vermeidung von Altersarmut zu einem zentralen Anliegen geworden, wie sein Entwurf zu einem Alterssicherungsstärkungsgesetz belegt. Derzeit ist die Armutsgefährdung der über 65-Jährigen nicht besonders ausgeprägt, wenngleich Noll/Weick (2012) in ihren Analysen für den Zeitraum 2003 bis 2008 eine steigende Tendenz der Altersarmut beobachten, die in den neuen Bundesländern deutlicher zu erkennen ist als in den alten Bundesländern. Als mögliche Ursachen für eine künftige Zunahme der Altersarmut werden die gegenüber früheren Erwerbsbiografien zunehmend unstetigen Erwerbsverläufe, Langzeitarbeitslosigkeit, Beschäftigung im Niedriglohnbereich, aber auch das Risiko einer Erwerbsminderung (EM) gesehen (Rische/Kreikebohm 2012). Erwerbsgeminderte Personen haben ein höheres Risiko im Alter arm zu sein, und es stellt sich die Frage, ob durch die Erwerbsminderungsrente – und gegebenenfalls vorhandene andere Einkünfte – eine ausreichende materielle Absicherung des betroffenen Personenkreises gewährleistet ist

PROCEEDINGS OF THE IEEE SPECIAL ISSUE ON APPLICATIONS OF AUGMENTED REALITY ENVIRONMENTS 1 Augmented Reality for Construction Site Monitoring and Documentation

Abstract—Augmented Reality allows for an on-site presentation of information that is registered to the physical environment. Applications from civil engineering, which require users to process complex information, are among those which can benefit particularly highly from such a presentation. In this paper, we will describe how to use Augmented Reality (AR) to support monitoring and documentation of construction site progress. For these tasks, the staff responsible usually requires fast and comprehensible access to progress information to enable comparison to the as-built status as well as to as-planned data. Instead of tediously searching and mapping related information to the actual construction site environment, our AR system allows for the access of information right where it is needed. This is achieved by superimposing progress as well as as-planned information onto the user’s view of the physical environment. For this purpose, we present an approach that uses aerial 3D reconstruction to automatically capture progress information and a mobile AR client for on-site visualization. Within this paper, we will describe in greater detail how to capture 3D, how to register the AR system within the physical outdoor environment, how to visualize progress information in a comprehensible way in an AR overlay and how to interact with this kind of information. By implementing such an AR system, we are able to provide an overview about the possibilities and future applications of AR in the construction industry

Incipient Social Groups: An Analysis via In-Vivo Behavioral Tracking

Social psychology is fundamentally the study of individuals in groups, yet there remain basic unanswered questions about group formation, structure, and change. We argue that the problem is methodological. Until recently, there was no way to track who was interacting with whom with anything approximating valid resolution and scale. In the current study we describe a new method that applies recent advances in image-based tracking to study incipient group formation and evolution with experimental precision and control. In this method, which we term "in vivo behavioral tracking," we track individuals' movements with a high definition video camera mounted atop a large field laboratory. We report results of an initial study that quantifies the composition, structure, and size of the incipient groups. We also apply in-vivo spatial tracking to study participants' tendency to cooperate as a function of their embeddedness in those crowds. We find that participants form groups of seven on average, are more likely to approach others of similar attractiveness and (to a lesser extent) gender, and that participants' gender and attractiveness are both associated with their proximity to the spatial center of groups (such that women and attractive individuals are more likely than men and unattractive individuals to end up in the center of their groups). Furthermore, participants' proximity to others early in the study predicted the effort they exerted in a subsequent cooperative task, suggesting that submergence in a crowd may predict social loafing. We conclude that in vivo behavioral tracking is a uniquely powerful new tool for answering longstanding, fundamental questions about group dynamics

EUROGRAPHICS 2007 / P. Cignoni and J. Sochor Short Papers Imperceptible Calibration for Radiometric Compensation

We present a novel multi-step technique for imperceptible geometry and radiometry calibration of projectorcamera systems. Our approach can be used to display geometry and color corrected images on non-optimized surfaces at interactive rates while simultaneously performing a series of invisible structured light projections during runtime. It supports disjoint projector-camera configurations, fast and progressive improvements, as well as real-time correction rates of arbitrary graphical content. The calibration is automatically triggered when misregistrations between camera, projector and surface are detected

Passive-Active Geometric Calibration for View-Dependent Projections onto Arbitrary Surfaces

In this paper we present a hybrid technique for correcting distortions that appear when projecting images onto geometrically complex, colored and textured surfaces. It analyzes the optical flow that results from perspective distortions during motions of the observer and tries to use this information for computing the correct image warping. If this fails due to an unreliable optical flow, an accurate -but slower and visiblestructured light projection is automatically triggered. Together with an appropriate radiometric compensation, view-dependent content can be projected onto arbitrary everyday surfaces. An implementation mainly on the GPU ensures fast frame rates