[in Japanese]

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[in Japanese]

View full abstract

[in Japanese]

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[in Japanese]

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The image of the meteorological satellite NOAA contains geometric distortions. They are corrected by registration processing. This paper presents an improved method of registration processing between the meteorological satellite NOAA image and the coastline image. The coastline image contains a ground control point (GCP). An improvement of this method is the reduction of processing time. This paper shows the validity of this method through many experiments. It also shows how registration processing can be speeded up depending on the selection of GCP.

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This paper presents a method for detecting skewed symmetry axes of objects. The adaptive Hough transform an iterative approach that requires small memory size, is used to determine three parameters of the axis feature. Location of the memory address in three dimensional space is determind from the position of each paired-pixel in the adge of the image. Parameters are determined by finding the local peak location in space. Parameter range is confined by the gradient of each pixel, which result in a clear calculation of the local peak and computing cost saving, Experimental results for both computer generated and natural objects show that this method is applicable to both curved and linear objects and is suitable for a small computer system.

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Described is a ew 10kW MOS-FET transmitter composed of the new single unit type modulator and the 10kW power amplifier. The new modulator was designed on the bases of the high voltage/low current mode of operation which consists of : high load impedance ; optimum design to maximize drain efficiency ; and suitable thermal design to protect MOS-FET's and low-pass filters against local temperature increase. The MOS-FET's and other components meet the specifications defined by the above design bases. The modulator unit is 230 × 530 × 700mm³ in size and 21kg. Forced air cooling at a flow rate of 10m/s was employed to keep the temperature increase on the MOS-FET case surfaces at 9°C, and on the low-pass filter coil surfaces at 31°C. Performance of the 10kW transmitter was : 82% or better power efficiency ; 2% distortion factor, and 52dB or better signal to noise ratio.

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This paper presents a method for detecting skewed symmetry axed of objects. The adaptive Hough transform, an iterative approach that requires small memory size, is used to determine threee parameters of the axis feature. Location of the memory address in three dimensional space is determined from the position of each paired-pixel in the edge of the image. Parameters are determined by finding the local peak location in space. Paremeter range is confined by the gradient of each pixel, which results in a clear calculation of the local peak and computing cost saving. Experimental results for both computer generated and natural objects show that this method is applicable to both curved and linear objects and is suitable for a small computer system.

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[in Japanese]

View full abstract