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A Reframed Watermark Extraction Approach Using the ABC Algorithm

Chinese Journal of Electronics 2021年第4期30卷 736-742页

作者： KRICHA Anis KRICHA Zied SAKLY Anis LATIS Lab National School of Engineers of Sousse University of Sousse National School of Engineers of Monastir University of Monastir Higher Institute of Applied Science and Technology of Sousse University of Sousse esir research unit National School of Engineers of Monastir University of Monastir

The fast development and the rapid spread of information technology have raised the issue of digitalimage copyright protection, which was mostly addressed through robust watermarking. To ensure the survival of the watermark after attacks, most works have been making use of an additional step at the embedding phase,and by so making the scheme unsuitable for real-time implementation. However, to be effective and secure, it is recommended to combine the watermarking algorithm and the capture sensor in one device. In this paper, we brought the extra stage to the detection side. We firstly studied the effect of some signal processing operations on a watermarked image, then we proposed a general model for watermark extraction whose parameters were determined using the artificial bee colony. The efficacy of the proposed method was validated by comparing its robustness with two state-of-art schemes focusing on the watermark extraction.

关键词： Robust watermarking Artificial bee colony(ABC) Adaptive extraction

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Effect of vibrating electrode on temperature profiles,fluid flow,and pool shape in ESR system based on a comprehensive coupled model

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China Foundry 2015年第4期12卷 285-292页

作者： Fang Wang Yan-chun Lou Rui Chen Zhao-wei Song Bao-kuan Li School of Materials and Metallurgy Northeastern University Shenyang research Institute of Foundry

The vibrating electrode method was proposed in the electro-slag remelting(ESR) process in this paper,and the effect of vibrating electrode on the solidification structure of ingot was studied.A transient threedimensional(3D) coupled mathematical model was established to simulate the electromagnetic phenomenon,fluid flow as well as pool shape in the ESR process with the vibrating electrode.The finite element volume method is developed to solve the electromagnetic field using ANSYS mechanical APDL software.Moreover,the electromagnetic force and Joule heating are interpolated as the source term of the momentum and energy equations.The multi-physical fields have been investigated and compared between the traditional electrode and the vibrating electrode in the ESR process.The results show that the drop process of metal droplets with the traditional electrode is scattered randomly.However,the drop process of metal droplets with the vibrating electrode is periodic.The highest temperature of slag layer with the vibrating electrode is higher than that with the traditional electrode,which can increase the melting rate due to the enhanced heat transfer in the vicinity of the electrode tip.The results also show that when the amplitude and frequency of the vibrating electrode increase,the cycle of drop process of metal droplets decreases significantly.

关键词： electro-slag remelting process vibrating electrode magneto-hydrodynamic numerical simulation

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