Impact sound-based automatic traffic accident detection method
A traffic accident and automatic detection technology, used in traffic flow detection, measurement devices, measurement of ultrasonic/sonic/infrasonic waves, etc., can solve problems such as large computational complexity, unfavorable real-time detection, inability to achieve results, and low misjudgment rate.
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[0027] The invention simultaneously adopts the energy distribution of the acoustic signal in the time domain, the energy distribution in the frequency domain and the autocorrelation function (Auto Correlation Function, ACF) as the feature of identifying the collision sound of the traffic accident, wherein the energy distribution in the frequency domain is extracted by wavelet. Specific steps are as follows:
[0028] 1) Collect acoustic signals and divide them into frames;
[0029] 2) Time domain total energy distribution detection, if the collision conditions are met, go to 3), otherwise go to 5);
[0030] 3) Wavelet-based frequency domain energy distribution detection, if the collision conditions are met, go to 4), otherwise go to 5);
[0031] 4) Detect ACF, if the collision conditions are met, send an alarm signal, otherwise go to 5);
[0032] 5) Wait for data collection until the next frame of data is full, and then proceed to the next frame of processing.
[0033] The e...
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