For traditional coherent effects, two separated identical point sources can be interfered with each other only when the optical path difference is integer number of wavelengths, leading to alternate dark and bright fringes for different optical path difference. For hundreds of years, such a perfect coherent condition seems insurmountable. However, in this paper, based on transformation optics, two separated in-phase identical point sources can induce perfect interference with each other without satisfying the traditional coherent condition. This shifting illusion media is realized by inductor-capacitor transmission line network. Theoretical analysis, numerical simulations and experimental results are performed to confirm such a kind of perfect coherent effect and it is found that the total radiation power of multiple elements system can be greatly enhanced. Our investigation may be applicable to National Ignition Facility (NIF), Inertial Confined Fusion (ICF) of China, LED lighting technology, terahertz communication, and so on.
A video watermarking scheme based on geometric moment corrected is proposed. This algorithm used the geometric moment’s good characteristic of corrected parameters of scaling attack, and combined with the randomness and fuzziness of Cloud model. In watermarking forming process we use the Cloud model. In detection process, first corrected the detected video sequence parameters of possible scaling attack by using geometric moment, and then extracted watermark from corrected video sequence. The experimental results show the robustness to lossy compression, filtering, frame dropping, additive noise, scaling and translation attacks.
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