Acoustic camera positioning error correction method based on point sound source

Abstract

The invention provides an acoustic camera positioning error correction method based on a point sound source. The method sequentially comprises the following steps that the point sound source is fixedto the diagonal position of a full anechoic chamber; equipment to be calibrated is placed in the same diagonal line of the point sound source position; a point sound source and an annular lamp are switched on; the equipment identifies the position of the annular lamp through a video image and determines the position of the point sound source in the picture; the position of the electric point soundsource in the acoustic image is identified through a microphone array; fusion parameters of the acoustic image point sound source position and the video picture point sound source position are calculated by an algorithm; the deflection equipment enables the point sound source to fall on the other position of the picture; the steps are repeated to test the position of the point sound source for multiple times; after calibration of a certain frequency point is completed, the point sound source is switched to other frequency points for calibration; and the steps are repeated to complete a complete calibration process. According to the method, the positioning error of the acoustic camera can be corrected, and the acoustic image can accurately coincide with the video image.

Description

【Technical field】 [0001] The invention relates to the technical field of acoustic cameras, in particular to a method for correcting positioning errors of acoustic cameras based on point sound sources. 【Background technique】 [0002] Acoustic cameras generally consist of a camera and a microphone array to capture video streams and acoustic images, respectively. When the microphone array is designed, the capture range of the acoustic image generally introduces the concept of viewing angle and resolution (same as the camera). The captured acoustic image and video stream need to be fused together for complete acoustic imaging functionality. [0003] The following factors will cause the perspectives of the acoustic image and the video image to not completely overlap: [0004] 1) The two viewing angle parameters themselves are inconsistent; [0005] 2) In terms of structural design, the origins of the two perspectives cannot completely coincide; [0006] 3) The signals between...

AI Technical Summary

Problems solved by technology

[0005] 2) In terms of structural design, the origins of the two perspectives cannot completely coincide;

[0006] 3) The signals between the channels of the microphone array cannot guarantee the ideal phase consistency and sensitivity consistency;

[0007] 4) The physical position of each channel of the microphone array has a certain drift due to assembly problems;

[0010] 7) There is a certain degree of picture distortion in the camera picture itself

Images