A Real-Time Face Tracking System Based On A Single PTZ Camera

It is evident that the effectiveness of education is strengthened from the assistance of distance learning which provides lectures online. The benefits of online education include enabling more distance courses based on local programs and increasing participation and interaction between the students and the instructor. Nowadays, conventional systems commonly implement a combination of static and PTZ cameras. However, such systems are not only costly but also require operators and high computational power in exchange. Thus, this thesis proposes a real-time face tracking system based on a single PTZ camera as a cost effective solution by minimizing hardware requirements and functioning automatically. The proposed system focuses on the delay possible to occur due to the movement of the PTZ camera and the network delay which varies the video frame rate which alters the performance from a software perspective. The main contributions include the low cost and flexibility regarding installation. Preliminaries are introduced as a basis of the proposed system such that hardware is maintained to be minimal and universal while software is retained to use less computational power. The proposed system minimizes the delays to maintain pace with the subject of interest, provides a smooth and natural movement of the camera as if an actual operator controls the camera, and produces competitive results regarding performance compared to conventional systems

Configuration entropy and instability of accelerating black hole in AdS

We consider the accelerating black hole with the negative cosmological constant in four-dimensional spacetime. There are two configurations such as the black string (BS) phase when the mass parameter is zero and the black hole (BH) phase when the mass parameter is non-zero. We investigate their stability via the configuration entropy (CE). It is found that the BS is not always stable but the BH has a thermally stable range below the critical mass of the BH, which is consistent with thermodynamic instability.Comment: 7 pages, 7 figure

Cosmic Microwave Background Radiation anisotropy with primordial magnetic fields

Galactic magnetic fields are observed of order $\sim 10^{-6}G$, but their origin is not definitely known yet. In this paper we consider the primordial magnetic fields generated in the early universe and analyse their effects on the density perturbations and the CMBR anisotropy. We assume that the random magnetic fields have the power law spectrum and satisfy the force-free field condition. The peak heights of the CMBR anisotropy are shown to be shifted upward depending on the magnetic field strengths relative to the no-magnetic field case.Comment: 22 pages, 5 figure

Constraints on the Reheating Parameters after Gauss-Bonnet Inflation from the Primordial Gravitational Waves

We study the effects of the Gauss-Bonnet term on the energy spectrum of inflationary gravitational waves. The models of inflation are classified into two types based on their predictions for the tensor power spectrum: red-tilted ($n_T0$), respectively, and then the energy spectra of the gravitational waves are calculated for each type of model. We find that the gravitational wave spectra are enhanced depending on the model parameter if the predicted inflationary tensor spectra have a blue tilt, whereas they are suppressed for the spectra that have a red tilt. Moreover, we perform the analyses on the reheating parameters involving the temperature, the equation-of-state parameter, and the number of $e$-folds using the gravitational wave spectrum. Our results imply that the Gauss-Bonnet term plays an important role not only during inflation but also during reheating whether the process is instantaneous or lasts for a certain number of $e$-folds until it thermalizes and eventually completes.Comment: 27 pages, 8 figures, v2: matches the published versio