Various aspects of plasma diagnostics for magnetic-confinement fusion reactors and material processing by the aid of laser techniques, were discussed and reviewed. The outline of 'System for Laser-aided Plasma Diagnostics', which was recently being equipped in Kyushu University, was de-scribed, and our research projects on the following two items were introduced: 1) novel techniques on the Thomson scattering to determine the electron and ion temperatures, and 2) particle measurement in plasmas by the application of laser spectroscopy. Laser spectroscopy made the determination of following parameters possible, namely the spatical distribution of the velocity, the temperature, the electric field, and the magnetic field, as well as the density distri-bution of various particles in plasmas.
In this paper, the new reduction method for bi-level image with tine line preservation, which is called LIP method, is proposed. In § 2, the conventional reduction methods are described. They have a demerit that eliminates the thin lines. In § 3, the algorithm of LIP method is described. This method can perfectly preserve the thin lines. In § 4, the image quality of processed images is discussed. LIP method makes a good combination with conventional reduction methods. In § 4, how to combine LIP method with a conventional reduction method is presented and the image quality processed by the combination method is also discussed.
Several methods determining optical flow have been proposed for stereo vision (passive ranging of depth and shape perception). "Gradient method" and "Matching method" are well known and representatives among them. But, there are many restrictions and problems to apply these methods to actual scene analysis. Recently, two of our authors proposed a new method for the optical flow determination with spatio-temporal correlation analysis of sequential image. In this paper, we develop our correlation method and try to apply out algorithms to Usefulness of the new algorithms is the stereo vision analysis. confirmed with artificial images and actual 3-D scenes.
This paper describes a dijital phase-locked oscilator for color demoduration in NTSC signals sampled by international standardized sampling frequency 13.5MHz. The phase lock is established by making phase difference a between local color subcarrier and color burst signals zero. Therefore, for generating of local color subcarrier sin(ωsc+θ). cos(ωsc+θ) and calcurating of θ= tan^<-1>(sinθ/cosθ). large capacity of ROM are required. In this paper, for reduction of the capacity of ROM, phase generating is carried out by using an accumulator, and detecting range of θ is limitted to ±π/4. Experimental results using a developed phase-locked circuit show that the standard and nonstandard NTSC signals are demodulated with good quality.