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Quantization Index Modulation is an important class of watermark methods, which has been widely used in blind watermark applications. And it is well known that spread transform dither modulation (STDM), as an extension of QIM, has good performance in robustness to random noise and re-quantization. However, the quantization step sizes used in STDM are random numbers not taking the feature of the image...
In the paper, the original image is divided into four parts by two different methods, which are taken as the observation signals in Independent Component Analysis (ICA) model. Then the watermark is embedded into DCT domain of the feature with the largest variance using iterative Adaptive Quantization Index Modulation (AQIM) and AQIM algorithms respectively. By comparing the performance of four kinds...
In this paper, we propose a novel video watermarking scheme based on motion location. In the proposed scheme, independent component analysis is used to extract a dynamic frame from two successive frames of original video, and the motion is located by using the variance of 8 × 8 block in the extracted dynamic frame. Then according to the located motion, we choose a corresponding region in the former...
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