基于图像处理的声相云图评价方法研究

doi:10.3969/j.issn.1000-1158.2020.08.15

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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 images 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 regioncenter are calculated. In the different capture distance planes of the sound imaging instrument, the position coordinates of the imaging regionscenteron 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.

Key words： metrology;sound imaging instrument image processing acoustic phase image positioning error

Received: 22 September 2019 Published: 13 August 2020

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TB95

Fund:National Key R&D Program of China

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	Articles by authors
	ZHANG Mo
	ZHENG Hui-feng
	ZHU Qin-feng

Cite this article:

ZHANG Mo,ZHENG Hui-feng,ZHU Qin-feng. Research on Evaluation Method of Acoustic Phase Image Based on Image Processing[J]. Acta Metrologica Sinica, 2020, 41(8): 983-988.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2020.08.15 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2020/V41/I8/983

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