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We present a high‐order solver for simulating vortex‐induced vibrations (VIVs) at very challenging situations, for example, VIVs of a row of very closely placed objects with large relative displacements. This solver works on unstructured hybrid grids by employing the high‐order tensor‐product spectral difference method for quadrilateral grids and the Raviart‐Thomas spectral difference method for triangular...
A novel semi-fragile image watermarking scheme based on wavelet is presented in this paper. The original image is first transformed into wavelet domain. The image features are subsequently generated from the lowest-frequency subband as embedded watermark by the condition judgment based on the mean value. Lastly, the watermark is embedded into the predetermined bit-plane in the given lower-frequency...
This paper describes a novel video coding scheme based on spatial resolution regulation. By comparing the R-D performance of spatially down-sampling coding scheme with standard coding schemes, the proposed coding scheme begins with coding the low-resolution edition of video sequence and subsequently coding difference video sequence when the bit-rate exceeds a threshold. The new scheme can be easily...
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