نتایج جستجو برای: dual frame

تعداد نتایج: 255107  

2006
CHRISTOPHER HEIL GITTA KUTYNIOK Vern I. Paulsen

This paper proves that every frame of windowed exponentials satisfies a Strong Homogeneous Approximation Property with respect to its canonical dual frame, and a Weak Homogeneous Approximation Property with respect to an arbitrary dual frame. As a consequence, a simple proof of the Nyquist density phenomenon satisfied by frames of windowed exponentials with one or finitely many generators is ob...

2004
Athanasios Leontaris Pamela C. Cosman

Multiple frame prediction has proved successful in increasing the performance of motion compensated video coders. Region-of-interest (ROI) coding in conjunction with a dual frame predictor can lead to interesting design choices on how to allocate the available bitrate among the frame regions. In this work, we tackle the problem of applying ROI coding on aerial imagery and then on standard video...

2015
Antonio Arcos David Molina Maria Giovanna Ranalli María del Mar Rueda

Data from complex survey designs require special consideration with regard to estimation of finite population parameters and corresponding variance estimation procedures, as a consequence of significant departures from the simple random sampling assumption. In the past decade a number of statistical software packages have been developed to facilitate the analysis of complex survey data. All the...

Journal: :Communications in Statistics - Simulation and Computation 2014
Yan Lu

Dual frame surveys, in which independent samples are selected from two frames to decrease survey costs or to improve coverage, can present challenges for regression coefficient estimation because of complex designs and unknown degree of overlap. In this research, we developed four regression coefficient estimators in dual frame surveys. Simulation results show that all the proposed methods work...

Journal: :CoRR 2015
Sergio Herrería-Alonso Miguel Rodríguez-Pérez Manuel Fernández-Veiga Cándido López-García

The IEEE has recently released the 802.3bj standard that defines two different low power operating modes for high speed Energy Efficient Ethernet physical interfaces (PHYs) working at 40 and 100Gb/s. In this paper, we propose the use of the well-known frame coalescing algorithm to manage them and provide an analytical model to evaluate the influence of coalescing parameters and PHY characterist...

Journal: :Adv. Comput. Math. 2012
Jameson Cahill Shidong Li

A dimension invariance property of finite frames of translates and Gabor frames is discussed. Under appropriate support conditions among the frame and dual frame generating functions, we show that a pair of dual frames evaluated in a given space remains a valid dual set if they are naturally embedded in the underlying space of almost arbitrarily enlarged dimension. Consequently, the evaluation ...

Journal: :EURASIP J. Adv. Sig. Proc. 2006
Yonina C. Eldar Ole W. Christensen

Given a frame for a subspace W of a Hilbert space H , we consider all possible families of oblique dual frame vectors on an appropriately chosen subspace V. In place of the standard description, which involves computing the pseudoinverse of the frame operator, we develop an alternative characterization which in some cases can be computationally more efficient. We first treat the case of a gener...

2004
Athanasios Leontaris Pamela C. Cosman

A special case of multiple frame prediction is the dual frame buffer, where an encoder uses both an immediate past frame and a long term past frame for motion compensation. Using a dual frame buffer together with intra/inter mode switching improves the compression performance of the coder. In this work, we investigate the effect of feedback in making better mode-switching decisions in the conte...

Journal: :Statistical Methods and Applications 2016
Maria Giovanna Ranalli Antonio Arcos María del Mar Rueda Annalisa Teodoro

Survey statisticians make use of the available auxiliary information to improve estimates. One important example is given by calibration estimation, that seeks for new weights that are close (in some sense) to the basic design weights and that, at the same time, match benchmark constraints on available auxiliary information. Recently, multiple frame surveys have gained much attention and became...

Journal: :VNU Journal of Science: Mathematics - Physics 2022

We have built the research model of dual resonant frame parameter generator based on actual circuit diagram implemented in laboratory to evaluate mechanism frame, two-frequency generator. The oscillator produces desired frequency w2 which depends pump and w1. On basis model, we successfully tested dual-frequency transmitter, makes it possible manufacture RF oscillators with low phase noise, the...

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