18 research outputs found

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    Omnidirectional Video Applications

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    In the past decade there has been a significant increase in the use of omni-directional video --- video that captures information in all directions. The bulk of this research has concentrated on the use of omni-directional video for navigation and for obstacle avoidance. This paper reviews omni-directional research at the VAST lab that address other applications; in particular, we review advances in systems to address the questions " What is/was there?" (tele-observation), "Where am I?" (location determination), "Where have I been?" (textured-tube mosaicing), and "What is moving around me and where is it?" (surveillance). In the area of tele-observation, we briefly review recent results in both human factors studies on user interfaces for omni-directional imaging in Military Operations in Urban Terrain (MOUT). The study clearly demonstrated the importance of omni-directional viewing in these situations. We also review recent work on the DOVE system (Dolphin Omni-directional Video Equipment) and its evaluation. In the area of location determination, we discuss a system that uses a panoramic pyramid imager and a new color histogram-oriented representation to recognize the room in which the camera is located. Addressing the question of "Where have I been?", we introduce the idea of textured tubes and present a simple example of this mosaic computed from omni-directional video. The final area reviewed is recent advances on target detection and tracking from a stationary omni-directional camera

    Analysis of recent empirical challenges to an account of time-to-collision perception

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    How do we perceive how long it will be before we reach a certain place when running, driving, or skiing? How do we perceive how long it will be before a moving object reaches us or will arrive at a place where it can be hit or caught? These are questions of how we temporally coordinate our actions with a dynamic environment so as to control collision events. Much of the theoretical work on the control of these interceptive actions has been united in supposing that (1) timing is functionally separable from positioning and the two are controlled using different types of information; (2) timing is controlled using special-purpose time-to-arrival information; (3) the time-to-arrival information used for the timing of fast interceptive actions is a first-order approximation to the actual time-to-arrival, which does not take accelerations into account. Challenges to each of these suppositions have recently emerged, suggesting that a complete rethinking of how interceptions are controlled may be necessary. These challenges are analyzed in detail and it is shown that they are readily accommodated by a recent theory of interceptive timing based on the points just noted
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