Let D be a self-adjoint differential operator of Dirac type acting on sections in a vector bundle over a closed Riemannian manifold M . Let H be a closed D-invariant subspace of the Hilbert space of square integrable sections. Suppose D restricted to H is semibounded. We show that every element ψ ∈ H has the weak unique continuation property, i.e. if ψ vanishes on a nonempty open subset of M , ...

We measured the mechanical properties of the respiratory system of C57BL/6 mice using the optimal ventilation waveform method in closed- and open-chest conditions at different positive end-expiratory pressures. The tissue damping (G), tissue elastance (H), airway resistance (Raw), and hysteresivity were obtained by fitting the impedance data to three different models: a constant-phase model by ...

‎In this paper we consider the minimization of a positive semidefinite quadratic form‎, ‎having a singular corresponding matrix $H$‎. ‎We state the dual formulation of the original problem and treat both problems only using the vectors $x in mathcal{N}(H)^perp$ instead of the classical approach of convex optimization techniques such as the null space method‎. ‎Given this approach and based on t...

Encrypting regions of interest in H.264/AVC and SVC bit streams after compression is a challenging task due to drift. In this paper, we assess whether the use of slice groups makes this task easier and what its expense in terms of bit rate overhead is. We introduce the concept of all-grey base layers for SVC which simplify the encryption of regions of interest in surveillance camera application...

The objective of this investigation is to produce recommendations for acceptable bit-rates of CCTV footage of people onboard London buses. The majority of CCTV recorders on buses use a proprietary format based on the H.264/AVC video coding standard, exploiting both spatial and temporal redundancy. Low bit-rates are favored in the CCTV industry but they compromise the image usefulness of the rec...

Surveillance video is characterized by short periods of activity in a small region of the image, and long periods of inactivity. When transmitting such video sequences over a wireless network, it is important to dynamically adapt the encoding of each stream according to both the video content and the underlying network conditions. We propose a video surveillance system that exploits H.264/AVC c...

A permutation group G?Sym(?) is said to be 2-closed if no H such that G<H?Sym(?) has the same orbits on ?×? as G. simple and efficient inductive criterion for 2-closedness established abelian groups with cyclic transitive constituents.

As security risks increase, the need to visually monitor and record events in the most remote areas becomes even greater. Moreover, the value of video surveillance has grown significantly with the advancement of high resolution megapixel video recording and video analytics. High quality megapixel H.264 video recording, combined with video analytics & intelligent sensors, bring forth the newest ...

The extension of H.264/AVC hybrid video coding towards scalable video coding (SVC) using motion-compensated temporal filtering (MCTF) is presented. Utilizing the lifting approach to implement MCTF, the motion compensation features of H.264/AVC can be re-used for the MCTF prediction step and extended in a straightforward way for the MCTF update step. The MCTF extension of H.264/AVC is also incor...

Automatic moving object detection is essential for various computer vision applications like video surveillance systems. Many previous moving object detection methods work for usually low-res video sequences under certain constraints. Either they perform detection process based on background learning and/or pixel-level motion analysis or they focus on detecting particular objects such as faces....