Abstract：Based on image processing, an acoustic phase image evaluation method is proposed to evaluate the sound source positioning error of the sound imaging instrument. Analyzing the imaging principle of sound imaging instrument, and the azimuth error and the pitch angle error are proposed as the evaluation indexes of the acoustic phase images sound source positioning error. The difference image method is used to extract the sound source localization imaging region of the acoustic phase image. After going through grayscale, binary, corrosion, expansion and the weighted average, the pixel coordinates of the imaging regioncenter are calculated. In the different capture distance planes of the sound imaging instrument, the position coordinates of the imaging regionscenteron the actual physical space are obtained by image calibration.Then comparing with the actual position coordinates of the positioned sound source, the azimuth error and the pitch angle error are calculated.The experimental results show that comparing the azimuth and pitch angle obtained by the proposed method with the actual value obtained by calculating the actual position coordinates of the sound source, the difference is small, which means that the sound source positioning error can be objectively evaluated and the method is easy to be operated.
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2020, Vol. 41 
