In this paper we introduce two innovative image and video watermarking algorithms. The paper’s main emphasis is on the use of chaotic maps to boost the algorithms’ security and resistance against attacks. By encrypting the watermark information in a one dimensional chaotic map, we make the extraction of watermark for potential attackers very hard. In another approach, we select embedding po...

Applying the particle filter (PF) technique, this paper proposes a PF-based algorithm to blindly demodulate the chaotic direct sequence spread spectrum (CDS-SS) signals under the colored or non-Gaussian noises condition. To implement this algorithm, the PFs are modified by (i) the colored or non-Gaussian noises are formulated by autoregressive moving average (ARMA) models, and then the paramete...

We study the properties of the two-point spectral form factor for classically chaotic systems with spin 1/2 in the semiclassical limit, with a suitable semiclassical trace formula as our principal tool. To this end we introduce a regularized form factor and discuss the limit in which the so-called diagonal approximation can be recovered. The incorporation of the spin contribution to the trace f...

the problem discussed in this paper is the effect of latency time on the ogy chaos control methodology in multi chaotic systems. the smith predictor, rhythmic and memory strategies are embedded in the ogy chaos control method to encounter loop latency. a comparison study is provided and the advantages of the smith predictor approach are clearly evident from the closed loop responses. the comple...

Qinghai Song, Wei Fang, Boyang Liu, Seng-Tiong Ho, Glenn S. Solomon, and Hui Cao* Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482, USA Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899, USA Department of Electrical Engineering and Computing Science, Northwestern University, Evanston, Illinois 60208, USA Received 31 May 2009;...

– The quantum-limited linewidth of a laser cavity is enhanced above the Schawlow-Townes value by the Petermann factor K, due to the non-orthogonality of the cavity modes. The average Petermann factor 〈K〉 in an ensemble of cavities with chaotic scattering and broken time-reversal symmetry is calculated non-perturbatively using random-matrix theory and the supersymmetry technique, as a function o...

In this paper, the influences of linewidth enhancement factor on output characteristics a semiconductor ring laser (SRL) are numerically investigated. By constructing master–slave injection model, we discuss influence SRL. addition, 0–1 chaos test is introduced to study effects factor, feedback strength, time delay and normalized current dynamic master laser. Furthermore, simulation carried out...

The purpose of this paper is to give a combinatorial characterization and also construct representations of the chaotic homology groups of the chaotic submanifolds of chaotic Buchdahi space by using some geometrical transformations. The chaotic homotopy groups of the limit for chaotic Buchdahi space are presented. The chaotic homology groups of some types of chaotic geodesics in chaotic Buchdah...