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W4: Real-time surveillance of people and their activities

by Ismail Haritaoglu, David Harwood, Larry S. Davis - IEEE Transactions on Pattern Analysis and Machine Intelligence , 2000
"... w4 is a real time visual surveillance system for detecting and tracking multiple people and monitoring their activities in an outdoor environment. It operates on monocular gray-scale video imagery, or on video imagery from an infrared camera. W4 employs a combination of shape analysis and tracking t ..."
Abstract - Cited by 709 (9 self) - Add to MetaCart
and track them. W4 can also determine whether people are carrying objects, and can segment objects from their silhouettes, and construct appearance models for them so they can be identified in subsequent frames. W4 can recognize events between people and objects, such as depositing an object, exchanging

Subsequences of frames ∗

by R. Vershynin , 1999
"... Every frame in Hilbert space contains a subsequence equivalent to an orthogonal basis. If a frame is n-dimensional then this subsequence has length (1 − ε)n. On the other hand, there is a frame which does not contain bases with brackets. 1 ..."
Abstract - Cited by 3 (1 self) - Add to MetaCart
Every frame in Hilbert space contains a subsequence equivalent to an orthogonal basis. If a frame is n-dimensional then this subsequence has length (1 − ε)n. On the other hand, there is a frame which does not contain bases with brackets. 1

Hierarchical Image Caching for Accelerated Walkthroughs of Complex Environments

by Jonathan Shade, Dani Lischinski, David H. Salesin, Tony Derose, John Snyder , 1996
"... We present a new method that utilizes path coherence to accelerate walkthroughs of geometrically complex static scenes. As a preprocessing step, our method constructs a BSP-tree that hierarchically partitions the geometric primitives in the scene. In the course of a walkthrough, images of nodes at v ..."
Abstract - Cited by 184 (10 self) - Add to MetaCart
at various levels of the hierarchy are cached for reuse in subsequent frames. A cached image is reused by texture-mapping it onto a single quadrilateral that is drawn instead of the geometry contained in the corresponding node. Visual artifacts are kept under control by using an error metric that quantifies

People-trackingby-detection and people-detection-by-tracking

by Mykhaylo Andriluka, Stefan Roth, Bernt Schiele, Technische Universität Darmstadt - In CVPR’08
"... Both detection and tracking people are challenging problems, especially in complex real world scenes that commonly involve multiple people, complicated occlusions, and cluttered or even moving backgrounds. People detectors have been shown to be able to locate pedestrians even in complex street scene ..."
Abstract - Cited by 190 (12 self) - Add to MetaCart
coherency within a walking cycle are modeled using a hierarchical Gaussian process latent variable model (hGPLVM). We show how the combination of these results improves hypotheses for position and articulation of each person in several subsequent frames. We present experimental results that demonstrate how

The Camera Mouse: Visual Tracking of Body Features to Provide Computer Access for People with Severe Disabilities

by Margrit Betke, James Gips, Peter Fleming - IEEE Transactions on Neural Systems and Rehabilitation Engineering , 2002
"... The "Camera Mouse" system has been developed to provide computer access for people with severe disabilities. The system tracks the computer user's movements with a video camera and translates them into the movements of the mouse pointer on the screen. Body features such as the tip of ..."
Abstract - Cited by 123 (33 self) - Add to MetaCart
of the user's nose or finger can be tracked. The visual tracking algorithm is based on cropping an online template of the tracked feature from the current image frame and testing where this template correlates in the subsequent frame. The location of the highest correlation is interpreted as the new

QUASICONFORMAL FRAMES

by Juha Heinonen, Pekka Pankka, Kai Rajala
"... Abstract. We consider n-tuples of differential 1-forms in the Euclidean n-space that satisfy a quasiconformality condition and an asymptotic closedness condition. We show that renormalized sequences of such tu-ples have subsequences converging to differentials of quasiregular maps. We then use these ..."
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Abstract. We consider n-tuples of differential 1-forms in the Euclidean n-space that satisfy a quasiconformality condition and an asymptotic closedness condition. We show that renormalized sequences of such tu-ples have subsequences converging to differentials of quasiregular maps. We then use

An Essay on Framing and Overflowing: Economic Externalities Revisited by Sociology

by Michel Callon - The Laws of the Markets, Oxford and Keele: Blackwell and the Sociological Review , 1998
"... When reviewing the conditions required for the existence of markets, no concept is more useful or appropriate than that of ‘externality’. The concept of externality is effectively central both to economies and to economics. So an attempt to clarify its significance and scope represents a suitable po ..."
Abstract - Cited by 73 (0 self) - Add to MetaCart
the concept of externality can be defined, together with its practical and theoretical implications. This will lead on to a discussion of the various mechanisms upon which the concept is predicated. I shall then touch first upon what I shall here refer to as ‘framing/overflowing ’ and upon the various issues

Effect of heifer frame size on their subsequent reproductive performance and preweaning performance of their calves

by G. J. Taylora, F. J. C. Swanepoelb, E. C. Webbc, A. Stroebelb
"... Abstract. The effects of heifer frame size on subsequent performance and the preweaning growth of calves were evaluated using records collected from theWaterburgEstates atOtjiwarongo,Namibia.Basedonhip height at 18months of age, heifers were assigned to three different frame size groups: small (< ..."
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Abstract. The effects of heifer frame size on subsequent performance and the preweaning growth of calves were evaluated using records collected from theWaterburgEstates atOtjiwarongo,Namibia.Basedonhip height at 18months of age, heifers were assigned to three different frame size groups: small (<

Error Concealment for Frame Losses in MDC

by Mengyao Ma, Student Member, Oscar C. Au, Senior Member, Liwei Guo, Student Member, S. -h. Gary Chan, Senior Member, Peter H. W. Wong
"... Abstract—Multiple description coding (MDC) is an effective error resilience (ER) technique for video coding. In case of frame loss, error concealment (EC) techniques can be used in MDC to reconstruct the lost frame, with error, from which subsequent frames can be decoded directly. With such direct d ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Abstract—Multiple description coding (MDC) is an effective error resilience (ER) technique for video coding. In case of frame loss, error concealment (EC) techniques can be used in MDC to reconstruct the lost frame, with error, from which subsequent frames can be decoded directly. With such direct

The Feichtinger conjecture for wavelet frames, Gabor frames, and frames of translates

by Marcin Bownik, Darrin Speegle - Can. J. Math
"... Abstract. The Feichtinger conjecture is considered for three special families of frames. It is shown that if a wavelet frame satisfies a certain weak regularity condition, then it can be written as the finite union of Riesz basic sequences each of which is a wavelet system. Moreover, the above is no ..."
Abstract - Cited by 18 (3 self) - Add to MetaCart
end by giving an example of a frame of translates such that any Riesz basic subsequence must consist of highly irregular translates. 1 Introduction and Statements of Main Results A frame is a collection of elements {ei: i ∈ I} in a Hilbert space H such that there
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