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This paper describes a kind of vision chip, which is an integration of an image processing circuit with photo receptors, that has a function of extracting objects' positions in focal plane. The objects' positions are output as their coordinates, which are useful for further detailed image recognition processing. The extraction processing has two steps; first, the flags indicating the objects' center positions are generated by analog parallel processing circuit implemented by resistive network and comparators, and next, the coordinates of such flags are generated by-and-priority encoders and a novel successive masking circuit. The designed circuit is capable of centroid detection for 23 23 pixels within 50 s, and the processing time is expected not to increase so much even if the number of pixels increases, which will represent an improvement over the conventional processor-based image processing system. We also proposed and evaluated another implementation of a centroid detector using pulse-width adder.

Abstrac-In Japan western 60Hz System, it is generally known that its longitudinal structure produces various system oscillations, such as long term osdation, l a d generator oscillation and oscillation caused by frequency control among systems.However, little is known ahout the wide-area phenomenon in systems. The purpase of this study is to establish the analysis method used aclual measurements and to clarify the oscillations in the power systems. Authors placed PMU (Phasor Measurement Unit) connected to lOOV outlets in some Universities in the 60Hz power system. PMU is synchronized based on the global positioning system (GPS) and measured data are transmitted via Internet. In present, the technique for clarifying the osdllation in the power systems is being investigated. This paper describes some results to evaluate the power system oscillation chamcteristics by PMU.