[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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The change of electronic property produced by the writing pressure was utilized in designing a basic device for an electronic blackboard system.
The irregular time interval output signal corresponding to the change of resistance value of a conductive sheet is stored in RAM as address information. The signal rearranged by the microcomputer is possible to transmit as a regular pulse train on the ordinary telephon lines. The frequency bandwidth is reduced as pressure points are successively monitored as moving information by line and local scanning. Further more, the image is successfully reproduced on CRT by the method that detects the maximum pressure points.

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This paper describes a color TV camera using a single interline-transfer CCD image sensor with Bayer geometry color filter array. Since this color camera obtains red and blue signals by a line sequential system and interpolates them by a zero-order hold circuit, a coloring like missregislation occurs at vertical contours and a lateral striped color distortion, tint changing repeatedly at every scanning line, occurs at scenes which brightness changes gradually in the vertical direction. The causes of these phenomena are explained. The methods compensating for them and these effects are specified. Further, a effect of an optical low-pass filter and a effect of adding an upper frequency component of green signal to input signals of three gamma correcting circuits are also described. These counter plans are very effective to improve the picture quality and this color camera satisfies the performance for home use by far.

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