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An algorithm of digital watermarking based on hyper chaos sequence and the discrete fractional Fourier transform (DFRFT) is proposed. First, the watermark image is scrambled in the spatial domain. The original image and the watermark image are discrete fractional Fourier transformed respectively with different order. Secondly, the watermark image's real part and imaginary part are encrypted by the...
In order to accommodate the different applications in wireless transmission environment, communication systems usually provide several configurable transmission modes. Therefore, transmission parameter signalling (TPS) is critical for the receiver to recognize the signal transmission modes. In this paper, the pseudo-noise (PN) training sequence with embedded signalling in the time domain synchronous...
The design problem of state feedback robust variance controller which guarantee the closed-loop steady-state variance to be less than a given upper bound and some H∞ performance is concerned for a class of Markov jump systems which mode is not available completely. Based on LMI method, system variance has been analyzed and the existence conditions for such controllers are proposed and proved. A parameterized...
Large number of watermarks is crucial for some real watermarking applications, such as transaction tracking. The purpose of this paper is to enlarge the structured watermarks based on balanced incomplete block designs (BIBD). An approach is proposed to generate new structured watermarks by combining existing BIBD-based watermarks. The corresponding recognition rules for the new set of watermarks are...
A robust adaptive PID controller is proposed for electromechanical speed control system with unknown uncertainties and external load disturbances. The robust adaptive controller is comprised of an optimal PID controller and a CMAC controller. The optimal PID controller is designed to stabilize the nominal system, and the CMAC controller is designed to compensate for the system unknown uncertainties...
Robustness is one essential requirement for watermarking systems. In order to improve robustness of watermarking systems, the purpose of this work is to design a new kind of watermarks based on balanced incomplete block designs (BIBD). The corresponding recognition rules for the proposed watermark are designed based on the structure information contained in the BIBD-based watermark. Experimental results...
In this paper, a robust digital watermarking algorithm against shearing is introduced. The proposed method makes use of the complete generalized orthogonal properties of orthogonal function system to achieve the piece-based orthogonal transform on the image. To strengthen the robustness of watermark, the significant middle frequently coefficients in the transformation matrix are picked up, based on...
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