Conference Publications
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PublicationEnhancing watermark robustness in medical images through knight’s tour-based algorithm(AIP Publishing, 2024-06)The paper introduces a novel watermarking scheme to enhance robustness and integrity in medical images using the Knight's Tour algorithm. Medical image digitization and sharing necessitate robust techniques for data security. Existing watermarking methods often lack resilience against attacks and maintain imperceptibility. To address these issues, the proposed scheme employs the Knight's Tour algorithm to determine the optimal pixel locations for watermark embedding. Extensive evaluations demonstrate its effectiveness against geometric attacks, specifically image rotation and scaling. The study's significance lies in providing a reliable solution for safeguarding medical image data, ensuring authenticity, and bolstering trust in healthcare applications. Moreover, the scheme's adaptability extends its significance to multimedia data protection and content authentication.
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PublicationEfficiency improvement of class E capacitive power transfer system using state feedback controller(IOS Press, 2024)This paper addresses the enhancement of efficiency in Class E Capacitive Power Transfer (CPT) systems by using a state feedback controller. Efficient operation is a critical concern in CPT systems due to their sensitivity to parameter variations, notably changes in coupling capacitance and load conditions. Variations in these parameters can substantially reduce the overall system efficiency. Therefore, this paper aims to develop a state feedback controller that can bolster system efficiency even in the presence of parameter variations. To be specific, this study begins by modelling the Class E CPT system using a combination of Generalized State-Space Averaging (GSSA) and Frequency-Domain Harmonic Analysis (FHA) techniques. Subsequently, a Lyapunov function is employed to devise the state feedback controller. The problem is then formulated using Linear Matrix Inequalities (LMIs) and tackled through the utilization of Yalmip. The efficacy of the proposed solution is validated through simulation work. The simulation results demonstrate that the proposed controller is capable of maintaining the CPT system’s output efficiency at a level exceeding 98%, even when subjected to a maximum of 30% variation in load conditions.
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PublicationA review paper on face recognition techniques(IEEE, 2023)The study of computer vision and pattern recognition is growing because of the various commercial and practical applications of these disciplines. Identification of individuals in a multitude, access control, forensics, and human-computer interactions are only among the topics studied by these areas. However, analyzing unconstrained face recognition poses ethical issues and privacy concerns. Many recent proposals employ Holistic Methods, Geometric Approach and Local-Texture Approach, methods and databases like ORL, FERET and AR Dataset to study constrained face recognition. At least some understanding of 2D perspective was achieved. This occurred in highly controlled environments where parameters such as camera angles, lighting and distance were strictly regulated. However, significant degradation in recognition performance occurred if the environment changed or the subject smiled or frowned. This critique discusses the technology utilized in face recognition, as well as the databases of methods that utilize this technology. To help guide future research, this article discusses current knowledge and suggests future directions for study in the field of facial recognition.
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PublicationShort-time fourier transform with optimum window type and length: an application for sag, swell and transient(Springer, 2023)The characteristics of power quality signals are non-stationary, where the behaviour confirms the negative consequence in sensitive equipment. Modern cross-term time-frequency distributions (TFDs) are able to characterize the power quality accurately but suffer from a delay in measurement since the power quality signals, in this case, sag, swell and transient, need to be analyzed in real-time. It is shown that one window shift (OWS) properties of linear time-frequency representation (TFR) results from short-time Fourier transform (STFT) satisfies accuracy, complexity and memory. By optimally selecting the window length of 512, the TFR is able to provide optimal time, and frequency localization, as well as the spectral leakage, can be reduced by the Hanning window. The proposed technique can accurately characterize the power quality signals averagely by 95%, as well as the complexity and memory usage is low. Finally, the paper is concluded by the recommendation of pre-setting for optimum window type and length for real-time power quality measurement.
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PublicationAn emerging detection design adopting two-keying technique in SAC-OCDMA-based MDW code(IEEE, 2023)This paper aims to enable the two-keying approach in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) system that employs modified double weight (MDW) code. To achieve this goal, two-keying subtraction detection (TKSD) is suggested, which also declines the impact of multiuser interference (MUI) and phase-induced intensity noise (PIIN). The results of simulation test demonstrate that the TKSD is efficient in realizing the two-keying detection feature in SAC-OCDMA system with superior bit-error rate (BER) performance, security, and transmission rate.