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Image matching technology is an important part of image processing technology. In this paper, the normal distributions transform (NDT) image matching algorithm and its application in the sonar image processing is studied. The NDT algorithm is based on a probability model. It calculates the co-ordinate of the image of the target point instead of the grey value, and this speeds up the sonar image matching...
The Underwater acoustic beacon is one of the most commonly used ocean acoustic instruments. It is installed in the underwater carrier and transmits signals according to certain rules. In this paper, we introduce an underwater acoustic beacon detection system based on a wavelet packet transform. The system is composed of a ruggedized computer, a directional receiving transducer, an angle sensor, a...
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