IEEE Trans Image Process - A combined microphone and camera calibration technique with application to acoustic imaging.

Tópicos

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Resumo

We present a calibration technique for an acoustic imaging microphone array, combined with a digital camera. Computer vision and acoustic time of arrival data are used to obtain microphone coordinates in the camera reference frame. Our new method allows acoustic maps to be plotted onto the camera images without the need for additional camera alignment or calibration. Microphones and cameras may be placed in an ad-hoc arrangement and, after calibration, the coordinates of the microphones are known in the reference frame of a camera in the array. No prior knowledge of microphone positions, inter-microphone spacings, or air temperature is required. This technique is applied to a spherical microphone array and a mean difference of 3 mm was obtained between the coordinates obtained with this calibration technique and those measured using a precision mechanical method.

Resumo Limpo

present calibr techniqu acoust imag microphon array combin digit camera comput vision acoust time arriv data use obtain microphon coordin camera refer frame new method allow acoust map plot onto camera imag without need addit camera align calibr microphon camera may place adhoc arrang calibr coordin microphon known refer frame camera array prior knowledg microphon posit intermicrophon space air temperatur requir techniqu appli spheric microphon array mean differ mm obtain coordin obtain calibr techniqu measur use precis mechan method

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