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Cui D.,Guangdong University of Petrochemical Technology | Cui D.,Guangdong Provincial Key Laboratory of Fault Diagnosis of Petrochemical Equipment | Gong Y.,Guangdong University of Petrochemical Technology | Yu G.,Guangdong University of Petrochemical Technology
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2015

In view of the low-level steady statistics of audio signal and uncorrelated property of discrete cosine transform(DCT), an adaptively quantized audio blind watermarking algorithm based on normed centre of gravity(NCG)is proposed here to achieve the copyright protection of digital audio. The original audio signal is framed by equalized length. The coordinates of NCGs are detected from the framed audio, and the watermark is embedded into the region which includes the NCGs. The adaptively quantized watermarking information is embedded in the low frequent coefficients of DCT domain. Experimental results show that the scheme has robustness and effectiveness and the algorithm security is guaranteed by using secret keys. ©, 2015, Nanjing University of Science and Technology. All right reserved. Source


Zuo J.,Guangdong University of Petrochemical Technology | Cui D.,Guangdong University of Petrochemical Technology | Cui D.,Guangdong Provincial Key Laboratory of Fault Diagnosis of Petrochemical Equipment | Gong Y.,Guangdong University of Petrochemical Technology | Liu M.,Guangdong University of Petrochemical Technology
Proceedings - 2015 2nd International Conference on Information Science and Control Engineering, ICISCE 2015 | Year: 2015

In order to trade-off between computational effects and computational cost of present image encryption algorithm, a novel image encryption algorithm based on lifting-based wavelet transform is proposed in this paper. The image encryption process includes three steps: first the original image was divided into blocks, which were transformed by lifting based wavelet, secondly the wavelet domain coefficients were encryption by random mask which generated by user key, and finally employing Arnold scrambling to encrypt the coefficients. The security of proposed scheme is depended on the levels of wavelet transform, user key, and the times of Arnold scrambling. Theoretical analysis and experimental results demonstrate that the algorithm is favourable. © 2015 IEEE. Source


Cui D.,Guangdong University of Petrochemical Technology | Cui D.,Guangdong Provincial Key Laboratory of Fault Diagnosis of Petrochemical Equipment | Gong Y.,Guangdong University of Petrochemical Technology | Liu M.,Guangdong University of Petrochemical Technology
Proceedings - 2015 2nd International Conference on Information Science and Control Engineering, ICISCE 2015 | Year: 2015

Digital watermarking is a technique used to embed an extra piece of information into multimedia signals. Aiming at content-based audio retrieval applications, a robust audio watermarking scheme resist to low bits rates compression is proposed. The performance of proposed algorithm is analysis by common signal processing such as Mp3 compression, Real compression, filtering, amplitude compression, equalization, echo, resembling, etc. Experiment results show that proposed algorithm is insensitive to small local change, and therefore is suitable for distinguishing different audios. © 2015 IEEE. Source


Delong C.,Guangdong University of Petrochemical Technology | Delong C.,Guangdong Provincial Key Laboratory of Fault Diagnosis of Petrochemical Equipment | Qirui L.,Guangdong University of Petrochemical Technology | Guilan Y.,Guangdong University of Petrochemical Technology | And 2 more authors.
IET Conference Publications | Year: 2014

According to the low-level steady statistics of audio signal and uncorrelated property of Stationary wavelet transform (SWT), a blind adaptively quantized audio watermarking algorithm based on NCG (Normed Centre of Gravity, NCG) is proposed in this paper to resist de-synchronization attacks. Firstly, the audio signal is framed by equalized length. Secondly, the coordinates of NCGS are detected from the framed audio, Finally, the copyright information is embedded into the low frequent coefficients of SWT domain region which includes the NCGS. Experimental results show that the scheme is robust against common signal processing attacks and malicious tampering attacks. More importantly, meanwhile security of the algorithm is guaranteed by using secret keys. Source


Yunfeng G.,Guangdong University of Petrochemical Technology | Delong C.,Guangdong University of Petrochemical Technology | Delong C.,Guangdong Provincial Key Laboratory of Fault Diagnosis of Petrochemical Equipment | Guilan Y.,Guangdong University of Petrochemical Technology | And 2 more authors.
IET Conference Publications | Year: 2014

In order to solve the shortages of present digital image watermarking algorithm, such as: perceptible quality degradation and the inherent conflict between imperceptibility and robustness. A novel image watermark algorithm based on non-negative matrix factorization (NMF) and discrete wavelet transform (DWT) is proposed in this paper. The processes of watermark embedding include three steps: Firstly, the preprocessing digital image is divided to not overlap image blocks and then decomposable coefficients are obtained by three-level DWT in each image blocks. Secondly, low frequency decomposition coefficients of block images are selected and then approximately represented as a product of a base matrix and a coefficient matrix using NMF. Finally, the feature vector represent original image is obtained by quantizing coefficient matrix, and then the copyright information is embedding by calculating the watermark and feature vector. Simulation results show that the scheme is robust against common signal processing attacks, and sensitive to malignity tamer, meanwhile security of the algorithm is guaranteed by using secret keys. Source

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