This study suggests an algorithm that creates ASCII art from a binary image. Our approach aims to generate ASCII art in a short period of time using multi-threaded local optimizations for a text placement method instead of a global optimization. To generate ASCII art from various images, the original image is first converted into a thinned black and white image suitable for generating ASCII art. We then extract the pixel orientations from the input image and introduce a character similarity scheme that considers these orientations. We also propose a novel text placement algorithm to complete ASCII art in a swift manner. Our final system suggested here can generate ASCII art using a variety of proportional fonts. The results of the experiments of this study show that the suggested system can generate ASCII art much faster than existing state-of-the-art techniques using proportional fonts.INDEX TERMS ASCII arts, black-and-white image, grayscale image, image processing.
The frequency characteristics of dielectric harrier discharge (DBD) have been studied for optimizing discharge efficiency. The experiment was performed with various experiment conditions to find the relation between the discharge frequency and power consumption. There is the optimum discharge frequency, which minimizes the consumption of the electrical power. Physically, the optimum discharge frequency means the inverse of the charge build-up time on the dielectric materials. Hence, the optimum discharge frequency depends on the capacitance of a reactor, which is a function of the geometry of the reactor and dielectric materials, and discharge conditions, which depends on the discharge voltage, and gases. From the experimental results, a semi empirical relation on the optimum frequency can he expressed as a function of the discharge gap, dielectric materials, sort of electrodes, and discharge gases.The use of atmospheric pressure air plasmas as reflectors for microwave radiation with frequencies up to 30 GHz requires electron densities of approximately IO" cm". It has been shown, that direct cument microhollow cathode sustained (MCS) discharges meet this requirement [I]. However, the power consumption of such air glow discharges of 5 kW/cm3 does not permit scaling to large volumes. Pulsing the discharge on a time scale, which is less than the characteristic time for glow-to-arc transition allows us to reduce the power density while keeping the average electron density at the required high value 121. So far the electron density in these pulsed discharges has been estimated using information on the plasma conducCvity; data on the electron energy which is sharply shifted towards higher energies during the pulse have only been obtained through modeling. We have measured the eleclron density in a pulsed atmospheric air plasma by means of heterodyne interferometry 131. A measure for the electron energy. the electron temperature, was obtained by means of emission spectroscopy. 20% argon was added to atmospheric air, and the relative intensities of two argon lines, at 810.37 nm and 811.52 nm, were measured. Assuming a Maxwell-Boltamann distribution of the electron energies allowed us to determine a value for the electron temperature. For a 10 ns pulse of 1.6 kV superimposed to a direct current discharge between electrodes 1.6 mm a art, the electron density increased from IO" cm" to more than 3 IO cm I. Over a time of 600 ns it decayed by one order of magnitude. Higher values of the electron density, and correspondingly longer decay times, which are determined by recombination, can be achieved by increasing the pulsed electric field 121. The electron temperature reached values of 50 eV. This value is in accordance with modeling results. The presence of such high energy in relatively large plasma volumes indicates that pulsed high pressure discharges in air, but also in other gases, have applications not only a plasma ramparts but also a plasma reactors, e.g for chemical decontamination. Other applications, where both high...
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