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With the development of flow visualizations and measuring techniques, the particle image velocimetry(PIV) is applied in experiments and researches of fluid gradually. But, the background noise is unavoidable in acquiring partical images. The experimental researches showed: the background noise, which will lead to errors or deviations in gray value of partical images, introduces errors in velocity...
Most traitor tracing schemes in the literature assume that pirate decoders are stateless. This stateless assumption, however, is unrealistic especially in case of hardware decoders. Any tracing algorithm based on the above assumption may draw a wrong detecting conclusion. The present approach converts a tracing algorithm for stateless decoder into a tracing algorithm for stateful decoder. By employing...
In a palette image file, each color is pointed by at least one palette entry and each pixel is represented with one of the color pointers. Since many palette images use a portion of palette entries only, this paper presents a distortion-free watermarking on palette images by exploiting the unused entries. It allocates x palette entries to one color such that each pixel of the color is able to embed...
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