Advances in network communications have necessitated secure local-storage and transmission of multimedia content. In particular, military networks need to securely store sensitive imagery which at a later stage may be transmitted over bandwidth-constrained wireless networks. This work investigates compression efficiency of JPEG and JPEG 2000 standards for encrypted images. An encryption techniq...

Future lithography systems must produce microchips with smaller feature sizes, while maintaining throughputs comparable to those of today’s optical lithography systems. This places stringent constraints on the effective data throughput of any maskless lithography system. In recent years, we have developed a datapath architecture for directwrite lithography systems, and have shown that compressi...

We suggest a technique for producing subfemtosecond pulses of radiation. The technique is based on using electromagnetically induced transparency to produce a strongly driven molecular coherence. This coherence results in a Raman spectrum with Bessel function amplitudes and phases corresponding to a frequency modulated signal, thereby allowing compression by the group velocity dispersion of the...

Multispectral imaging is becoming an increasingly important tool for monitoring the earth and its environment from space borne and airborne platforms. Multispectral imaging data consists of visible and IR measurements from a scene across space and spectrum. Growing data rates resulting from faster scanning and finer spatial and spectral resolution makes compression an increasingly critical tool...

This paper describes a speech coder for low bit rates using a parametric representation of voiced excitation waveforms (Glottal ARX) and standard LPC for unvoiced. For efficient compression purposes the excitation and spectrum parameters are quantized with vector quantization (VQ). This has resulted in a glottal vocoder operating at 1320 bits/s and sounding more natural than a standard LPC voco...

Delivering broadcast-quality content to consumers is one of the most challenging tasks in the new world of digital broadcasting. One of the most critical aspects is the highly efficient use of the available transmission spectrum. Consequently, a careful choice of compression schemes for media content is essential – for both the technical and the economical feasibility of modern digital broadcas...

The paper presents the results of implementation in the Matlab environment for watermarking embedder and extractor based on the Direct Sequence Spread Spectrum (DSSS). A block diagram of watermarking system, an analysis of watermarked signal reproduced as well as watermarking system robustness to degrading factors: lossy compression, signal-to-noise ratio (SNR) as well as a change in sampling f...

StirMark Benchmark is a well-known evaluation tool for watermarking robustness. Additional attacks are added to it continuously. To enable application based evaluation, in our paper we address attacks against audio watermarks based on lossy audio compression algorithms to be included in the test environment. We discuss the effect of different lossy compression algorithms like MPEG-2 audio Layer...

L ike surface water wave breaking, optical wave breaking (WB) is a phenomenon that occurs when an optical pulse propagates in a normally dispersive nonlinear fiber. It is often avoided in fiber continuum compression experiments by using lower coupling power or shorter fiber length, because the WB-extended continuum has higher-order spectral phase distortions that cannot be compensated by a quad...

A suboptimal joint bandwidth and power allocation for cooperative relay networks: A cooperative game theoretic approach Fair and efficient spectrum splitting for unlicensed secondary users in cooperative cognitive radio networks A self-adaptive regression-based multivariate data compression scheme with error bound in wireless sensor networks A midterm DBA algorithm for quality of service on agg...