Three-Dimensional Imaging by Using Singularity-Spreading Phase Unwrapping Method
When ultrasound is used to measure a three-dimensional (3D) object’s shape, the interference often results in amplitude reduction of the backscattered wave so that its arrival time cannot be calculated properly. This leads to inaccurate measurement of the distance between the ultrasonic transmitter/receiver and the object. To resolve this problem, we propose a novel method. We assume that the problem of irregular distance is the same problem as the cancellation of singular points in the so-called phase-unwrapping process. The technique that we propose cancels singular points by spreading the singularity. In this paper, we compare experimental results of our technique, the singular-spreading phase unwrapping method, and a conventional technique, the minimum cost network flow method. The experiments demonstrate that our technique performs imaging better than the conventional technique.
Key wordsThree-dimensional imaging Phase unwrapping Singularity-spreading phase unwrapping
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