Acoustic camera positioning error correction method based on point sound source

A positioning error and point sound source technology, which is applied in the field of point sound source-based acoustic camera positioning error correction, can solve the problems of camera image distortion, incomplete coincidence of the origin, inability to guarantee consistent phase and consistent sensitivity, etc., to improve calibration The effect of efficiency

Inactive Publication Date: 2020-10-16
杭州兆华电子股份有限公司
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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 ...

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  • Acoustic camera positioning error correction method based on point sound source

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Embodiment Construction

[0028] A method for correcting the positioning error of an acoustic camera based on a point sound source of the present invention comprises the following steps in sequence:

[0029] S1. Selection of calibration environment: the calibration process is performed in a full anechoic room environment;

[0030] S2. The position of the point sound source: fix the point sound source at the diagonal position of the full anechoic chamber;

[0031] S3. The location of the device: place the device to be calibrated on the same diagonal line as the point sound source, at a distance L from the point sound source;

[0032] S4. Turn on the point sound source, and the ring light 4 on the point sound source;

[0033] S5. The device recognizes the position of the ring light 4 through the video image, and determines the position of the point sound source in the picture; the device recognizes the position of the electric point sound source on the acoustic image through the microphone array; the al...

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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...

Claims

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Application Information

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IPC IPC(8): G01S5/24H04N17/00H04N5/232
CPCG01S5/24H04N17/002H04N23/60
Inventor 曹祖杨张凯强包君康周航陈卓楠
Owner 杭州兆华电子股份有限公司
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