The performance of the surface current observing network of high frequency ground wave radars (HFGWRs) in the Gulf of Thailand (GoT) is evaluated. Based on the Dilution of …
This article investigates the problem of adaptive tracking control for stochastic nonlinear systems with deferred state constraints. The novel unified universal barrier function …
Abstract Fog that refers to the concentration of ice or water droplets in the near surface air is an important short-time meteorological phenomenon. As the measure of visibility of …
针对视频版权的保护,提出了一种基于改进的JND模型的视频水印算法。此算法首先选取二值图像作为图像水印,利用Logistic混沌映射对图像进行加密;然后对载体视频进行关键帧提取,将提取的帧进行4层小波分解,结合分形理论对小波系数进行D树和R树的存储,并根据人类视觉系统(HVS)提出改进的JND模型,进而将处理后的水印信息按照三个方向自适应的嵌入到D树和R树中。 …
