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In studies of fish behavior or the ecology of schooling fish and in estimating fish biomass, information on fish position and size are required.A method was designed for determining the position of fish in three dimensions using stereo photographs taken with an under water stereo camera system. From the obtained fish positions, the distance between fish and the camera, the size, aspect and bearing angles of fish in the field of view of the camera were calculated. The absolute errors in measurement using the present method are 0.75% for length and 0.77% for distance. The method can be successfully applied to fish with any aspect within the field of view of the stereo camera system.The results suggest that in situ information on fish can be studied in detail using this technique.

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FPGA has been widely used in data acquisition and processing in modern industrial production and scientific research due to its integration of VLSI and programmable devices. In this paper, a multi-channel data acquisition system based on FPGA is designed to meet the requirements of data acquisition in aircraft power supply inspection. The designed system realizes the conversion from FPGA local bus to PCI bus through PCI9054 bridge chip, and then completes the connection and communication between the data acquisition system and the upper motherboard through PCI bus. The system debugging results show that the designed system can realize the data acquisition and processing function.