Analisa Perbandingan Deteksi Tepi Pada Citra Digital Mengalami Blur Menggunakan Shen-Castan Dan Canny-Deriche

Algoritma pada Filter Infinite Impulse Response (FIIR) terdiri dari dua buah yaitu Algoritma Shen-Castan dan Algoritma Canny-Deriche. Dua algoritma ini menggunakan cara yang berbeda untuk melakukan deteksi tepi. Tujuan dari penelitian ini adalah membandingkan algoritma Canny-Deriche dengan algoritma Shen-Castan pada kondisi citra  uji yang mengalami gangguan noise dan juga mengalami gangguan efek blur. Hasil pengujian adalah algoritma Canny-Deriche cukup mampu dengan jelas mendeteksi tepi citra walau citra uji mengalami gangguan efek buram dibandingkan dengan algoritma Shen-Castan dimana intensitas tepi objek lebih tinggi dibandingkan dengan intensitas noise yang terfilter. Kata Kunci— Deteksi Tepi, Shen-Castan, Canny-Deriche, Citra Bura

Generalized theory and application of Stokes parameter measurements made with a single photoelastic modulator

We report in this paper a generalized theory that describes the interaction between a monochromatic light beam and an optical system that includes one photoelastic modulator, one analyzer, and one photodetector. Based on the theory, a detailed four-step procedure is presented, which allows a precise measurement of the four Stokes parameters. An analysis of the systematic and random errors arising from the four-step measurements is also given as well as a calibration procedure that involves the use of a general retardation plate. As a practical application the procedure is used to analyze the magneto-optical properties of magnetic thin films grown on GaAs(001) substrates

Combined Generation and Optimization of a Wind-Solar-Battery Power System

Compared with other renewables, wind and solar have been established as proven future sources of energy, because of their environment-friendly, safe and cost-effective characteristics. However, there are some difficulties associated with combined utilization of solar and wind, e.g. intermittency of wind and of the solar radiation, and their variation do not match the time distribution of the demand. For this purpose, advanced network of multiple renewable energy systems with storage units have been proposed. Small-scale standalone combination of solar, wind and battery has been found effective in some independent power supply system. Proposed in this research on a standalone distributed hybrid power system which consists of solar power, wind power and battery storage. A control strategy is introduced to maximize the simultaneous energy harvesting from both renewable sources. The supervisory controller results in five contingencies considering the level of power generation available at each renewable energy source and the state of charge in the battery. Power converters interface the source with a common DC bus. The interfacing converter is controlled either as a current or a voltage source. A supervisory controller is proposed to accomplish the source type allocations and balance of energy in the operating contingencies. Simulation results demonstrate accurate operation of the controllers and functionality of the maximum power point tracking algorithm in each operating condition both for solar and for wind power

Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model

We study a new version of the one-dimensional spin-orbital model with spins S=1 relevant to cubic vanadates. At small Hund's coupling J_H we discover dimerization in a pure electronic system solely due to a dynamical spin-orbital coupling. Above a critical value J_H, a uniform ferromagnetic state is stabilized at zero temperature. More surprisingly, we observe a temperature driven dimerization of the ferrochain, which occurs due to a large entropy released by dimer states. This dynamical dimerization seems to be the mechanism driving the peculiar intermediate phase of YVO_3.Comment: 5 pages, 4 figure