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Your search keyword '"Qu, Zhiguo"' showing total 18 results
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18 results on '"Qu, Zhiguo"'

10. Contributors

Author

Arends, Hugo A., primary, Bai, Dan, additional, Chandra, Pranjal, additional, Frisch, Christian, additional, Gizeli, Electra, additional, Grammoustianou, Aristea, additional, Hentrich, Christian, additional, Hu, Jie, additional, Kakabakos, Sotirios, additional, Knappik, Achim, additional, Koets, Marjo, additional, Koukouvinos, Georgios, additional, Kumar, Suveen, additional, Lemass, D., additional, Li, Zedong, additional, Lin, Min, additional, Liu, Zhi, additional, Luong, John H.T., additional, Mahato, Kuldeep, additional, Makarona, Eleni, additional, Maurya, Pawan K., additional, Misiakos, Konstantinos, additional, Moran, K.L.M., additional, O'Kennedy, R., additional, Petrou, Panagiota, additional, Qu, Zhiguo, additional, Raptis, Ioannis, additional, Singh, Renu, additional, Srivastava, Ananya, additional, Ten Haaf, Andre, additional, van Amerongen, Aart, additional, Vashist, Sandeep K., additional, Veen, Jeroen, additional, Xu, Feng, additional, Ylera, Francisco, additional, You, Minli, additional, and Zhang, Penghui, additional

Published
2018
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17. A Blind Watermarking Algorithm Based on Modular Arithmetic in the Frequency Domain.

Author

Elleithy, Khaled, Jin, Cong, Zhang, Zhongmei, Jiang, Yan, Qu, Zhiguo, and Ma, Chuanxiang

Abstract

Robustness is the important issue in watermarking, robustness at the same time with blind watermark recovering algorithm remains especially challenging. This paper presents a combined DWT and DCT still image blind watermarking algorithm. The two-level DWT are performed on the original image, the low-frequency sub-band is divided into blocks, the DCT is performed on the every block, the DCT coefficients of every block are sorted using Zig-Zag order, the DCT low-frequency coefficient is selected as embedding watermarking. The watermarking signals are embedded into the selected embedding points using the modular arithmetic. The watermark recovering is the inverse process of the watermark embedding, according to the answer of the modular arithmetic, we can estimate the value of embedded the watermark. The algorithm is compared with a pure DWT-based scheme Experiment results shown that the proposed algorithm is robust to many attacks such as JPEG compression, addition noise, cropping, JPEG compression, median filter, rotation, and resize etc. Proposed algorithm is shown to provide good results in term of image imperceptibility, too. [ABSTRACT FROM AUTHOR]

Published
2007
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18. A Wavelet Packets Watermarking Algorithm Based on Chaos Encryption.

Author

Gavrilova, Marina, Gervasi, Osvaldo, Kumar, Vipin, Tan, C. J. Kenneth, Taniar, David, Laganà, Antonio, Mun, Youngsong, Choo, Hyunseung, Cong, Jin, Jiang, Yan, Qu, Zhiguo, and Zhang, Zhongmei

Abstract

In this paper, a wavelet packets watermarking algorithm based on chaos encryption for still digital images is presented. The watermarking is changed into bit sequence by modular arithmetic, at the same time, a random sequence is gotten by using a chaos map and deal with it also by modular arithmetic. After getting these two sequences, we do XOR arithmetic, then getting a new encrypted watermarking sequence. At the embedding stage, wavelet packets decomposition is used for original image, then embedding encrypted watermarking sequence into some frequency bands of original image by repeatedly embedding four times. At the extracting stage, wavelet packets decomposition for original image and watermarked image are used to inverse process. The experiment results demonstrated the new algorithm is robust for scaling, cropping, JPEG compression and noise attack. [ABSTRACT FROM AUTHOR]

Published
2006
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