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[IEEE 2018 IEEE 3rd International Conference on Image, Vision and Computing (ICIVC) - Chongqing (2018.6.27-2018.6.29)] 2018 IEEE 3rd International Conference on Image, Vision and Computing (ICIVC) - Angle Quantization Index Modulation Based on Block Compressive Sensing for Robust and Secure Image Watermarking
摘要： A novel angle quantization index modulation watermarking scheme based on block compressive sensing (BCS-AQIM) is proposed to embed robust and secure watermark. In this algorithm, sparse random matrices constructed by chaotic sequence are chosen as the measurement matrix and the measurement vector of host image is obtained by block compressive sensing. In each block, two optimal measurements are chosen to embed the watermark into their angle. Then, the watermarked image is recovered through the algorithm. The measurement matrix and the position of watermarked measurements are used as a key. The performance of BCS-AQIM under AWGN attacks and its security are analyzed and assessed by simulations. Experiment results demonstrate that the proposed method is robust to different types of attacks and outperforms common existing methods in terms of the robustness.
关键词： robustness,angle quantization index modulation,block compressive sensing,security
更新于2025-09-09 09:28:46
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Enhanced Index Modulated OFDM Spread Spectrum
摘要： Index modulated OFDM spread spectrum (OFDM-IM-SS) is a recently proposed scheme, which transmits the additional bits (index bits) through the code domain. In this paper, we propose a novel variant of OFDM-IM-SS, called index modulated OFDM with in-phase/quadrature spread spectrum (OFDM-IM-SS-IQ), to increase the spectrum efficiency of OFDM-IM-SS. In OFDM-IM-SS-IQ, the transmitted symbols are divided into in-phase and quadrature parts, which are combined by the corresponding spreading codes selected by their respective index bits. A low complexity detection algorithm for OFDM-IM-SS-IQ is investigated to relieve the computational complexity of the optimal maximum-likelihood detection. A closed-form of the upper bound on the bit error rate is then derived to evaluate the error performance of OFDM-IM-SS-IQ. In addition, a diversity-enhancing scheme of OFDM-IM-SS, named index modulated OFDM spread spectrum enhancement (OFDM-IM-SS-E), is also designed to achieve a full diversity order. Computer simulation results validate the theoretical analysis and show that OFDM-IM-SS-IQ outperforms the conventional OFDM-IM-SS scheme. They also prove that the proposed OFDM-IM-SS-E obtains full diversity and achieves a better bit error rate performance than OFDM-IM-SS.
关键词： diversity,OFDM,index modulation,low complexity,spread spectrum
更新于2025-09-04 15:30:14