Abstract
Digital picture processing is widely used in almost every field of engineering with aid of computer and optoelectronics. In recent years the ultrasonic imaging with use of digital processing technique grows more important in the computer tomo-graphic scanning for medical examination or nondestructive testing. But there are very few papers about the fundamental research of ultrasonic imaging. In the present paper, we have made the underwater ultrasonic imaging system using microcomputers and discussed the power of resolution in the horisontal plane and the appropriate method for three dimensional display of ultrasonic image. Through some experiments the objects under water can be resolved and recognized with the error of at least 1.5mm. The psudo-color representation, edge-enhancement and isometric display are found to be effective to understand the three dimensional figure of objects.
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