Good quality compressed video can be obtained with a subband coding structure using a wavelet-based Digital Filter-Bank (DFB). For an eecient implementation , the lter-bank can be decomposed into a ladder structure. The lowest frequency subband is coded with a modiied H.261 codec, and the higher frequency subbands are coded using either Entropy-Constrained Vector Quantization (ECVQ) or Entropy-...

This paper presents a model-based transrating (bit-rate reduction) system for H.264 coded video via requantization. In works related to previous standards, optimal requantization step-sizes were obtained via Lagrangian optimization that minimizes the distortion subject to a rate constraint. Due to H.264 advanced coding features, the choices of quantization step-size and coding modes are depende...

9 S. J. Barnett, Physic. Rev., 25, 835, 1925. 10 This can, for instance, be seen from Darwin's Lagrangian and Hamiltonian functions for atoms in magnetic fields, Phil. Mag., 39, 537, 1920. 11 P. Tartakowsky, Zeits. f. Physik, 34, 216, 1925. 12 P. Debye, Physic. Rev., 25, 586A, 1925. 13 A. Pascal, numerous references listed in Jahr. d. Rad. and Elektr., 17, 184, 1920. 14 The value e = 1.0000693 ...

Layered Wyner-Ziv Video Coding for Noisy Channels. (August 2004) Qian Xu, B.S., University of Science & Technology of China Chair of Advisory Committee: Dr. Zixiang Xiong The growing popularity of video sensor networks and video celluar phones has generated the need for low-complexity and power-efficient multimedia systems that can handle multiple video input and output streams. While standard ...

Two new design techniques for adaptive orthogonal block transforms based on vector quantization (VQ) codebooks are presented. Both techniques start from reference vectors that are adapted to the characteristics of the signal to be coded, while using different methods to create orthogonal bases. The resulting transforms represent a signal coding tool that stands between a pure VQ scheme on one e...

This paper presents a new method for speech coding at rates around 1.2 kbps based on STRAIGHT, a high quality speech analysis-synthesis method. For encoding spectral information, Modified Restricted Temporal Decomposition (MRTD) based vector quantization is used, where MRTD is a method of temporal decomposition for line spectral frequency parameters. Meanwhile, pitch and gain parameters are cod...

A new algorithm for wavelet compression is presented. This algorithm was developed speciically for the Small Spacecraft Technology Initiative (SSTI) Clark mission which requires 3m ground resolution data to be transmitted down over a relatively slow data link. Hence the data needs to be reduced by at least an order of magnitude, yet has to maintain the high resolution as much as possible. Our a...

PHYSICAL LAYER SECRET KEY AGREEMENT USING ONE-BIT QUANTIZATION AND LOW-DENSITY PARITY-CHECK CODES John A. Snoap Old Dominion University, 2016 Director: Dr. Dimitrie C. Popescu Physical layer approaches for generating secret encryption keys for wireless systems using channel information have attracted increased interest from researchers in recent years. This paper presents a new approach for cal...

This paper considers the joint problem of dirty-paper and Wyner-Ziv coding with partial host information at the receiver. The rate-distortion and the capacity expressions have been derived for the Gaussian case. It is shown that the availability of the partial host information to the receiver has positive effects to the compression performance and the overall capacity. Moreover, a practical cod...