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126 results on '"Li, Wangwang"'

26. Segment‐Adaptive Spread Spectrum Audio Watermarking Using NSGA‐II

Author

LI Wangwang, Zhang Guofu, Zhou Xianxian, and SU Zhao-pin

Subjects
Spread spectrum, Audio signal, Robustness (computer science), Computer science, Applied Mathematics, Genetic algorithm, Sorting, Embedding, Electrical and Electronic Engineering, Algorithm, Digital watermarking, Field (computer science)
Abstract

In the field of robust audio watermarking, how to seek a good trade-off between robustness and imperceptibility is challenging. The existing studies use the same embedding parameter for each part of the audio signal, which ignores that different parts may have different requirements for embedding parameters. In this work, the constraints on imperceptibility are first analysed. Then, we present a segment multi-objective optimization model of the scaling parameter under the constrained Signal-to-noise ratio (SNR) in Spread spectrum (SS) audio watermarking. Additionally, we adopt the Nondominated sorting genetic algorithm II (NSGA-II) to solve the proposed model. Finally, we compare our algorithm (called SS-SNR-NSGA-II) with the existing methods. The experimental results show that the proposed SS-SNRNSGA-II not only provides flexible choices for different application demands but also achieves more and better trade-offs between imperceptibility and robustness.

Published
2021

35. A steganographic method based on gain quantization for iLBC speech streams

Author

Li Wangwang, Xianxian Zhou, Zhaopin Su, Donghui Hu, and Guofu Zhang

Subjects
Steganalysis, Steganography, Computer Networks and Communications, Computer science, business.industry, Quantization (signal processing), Speech recognition, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Vector quantization, Codebook, 020207 software engineering, Cryptography, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Hardware and Architecture, 0202 electrical engineering, electronic engineering, information engineering, Media Technology, Codec, 020201 artificial intelligence & image processing, Internet Low Bitrate Codec, business, Software, Information Systems
Abstract

Under the premise of ensuring good speech quality and resistance to steganalysis, how to embed as much information as possible into low-bit-rate speech is a challenge. The existing research mainly focuses on least significant bits in the compressed speech streams or line spectral frequencies in the encoding processes of the G.723.1 and G.729a codecs. In this paper, we are concentrating on steganography in Internet Low Bitrate Codec speech streams. Specifically, we present a novel steganographic method on the basis of the gain quantization (GQS), which is included in the vector quantization of dynamic codebooks. The secret information is embedded by modifying the search range of the gain codebook to quantize the gain value. The experimental results show that the proposed GQS method achieves a higher hiding capacity, less signal distortion, and better resistance to steganalysis.

Published
2019

47. 355 nm All-Solid-State Ultraviolet Laser Direct Writing and Etching of Micro-Channels in Borosilicate Glass

Author

李旺旺 Li Wangwang, 李奇思 Li Qisi, 雷程 Lei Cheng, 林立娜 Lin Lina, 杨娇燕 Yang Jiaoyan, 熊继军 Xiong Ji-jun, and 梁庭 Liang Ting

Subjects
Materials science, business.industry, Borosilicate glass, Laser direct writing, medicine.disease_cause, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Etching (microfabrication), All solid state, medicine, Optoelectronics, Electrical and Electronic Engineering, business, Ultraviolet
Published
2018

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