Vehicle speed measurement method, supervisory computer and vehicle speed measurement system
A measuring method, technology of monitoring machine
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Example Embodiment
[0064] Example one
[0065] See figure 1 , Is a vehicle speed measurement method provided by an embodiment of the present invention, including the following steps:
[0066] Step S101: The monitoring machine receives multiple frames of images collected by the close-up camera at a preset frequency for the vehicle to be tested.
[0067] Because the time for the vehicle to pass through the field of view is very short, generally less than 1 second, in order to ensure real-time requirements, it is preferable that the close-up camera collects 25 frames of images per second, and the interval between the close-up camera images is required to be as equal as possible, so that It uses the number of frames passed by the vehicle to estimate the time spent.
[0068] Step S102: The monitoring machine calculates the license plate running trajectory of the multi-frame images, determines whether the license plate running trajectory is correct, and selects a multi-frame image with the correct license pla...
Example Embodiment
[0131] Example two
[0132] See Figure 4 , Is a monitoring machine provided by an embodiment of the present invention for vehicle speed measurement, including:
[0133] Receiving module 401: used to receive multiple frames of images collected by the close-up camera for the vehicle under test at a preset frequency;
[0134] Image selection module 402: used to calculate the license plate running trajectory of the multi-frame images, determine whether the license plate running trajectory is correct, and select multi-frame images with the correct license plate running trajectory as the image group to be analyzed;
[0135] Vehicle speed calculation module 403: used to track and calculate the license plate imaging distance of multiple frames of images in the image group to be analyzed, and calculate the actual distance corresponding to the imaging distance according to the corresponding relationship between the real world coordinate system and the imaging coordinate system, and use the actu...
Example Embodiment
[0145] Example three
[0146] See Figure 5 , Is a vehicle speed measurement system provided by an embodiment of the present invention, including: a close-up camera 501, a supplementary light source 502, and the monitoring machine 503 described in the foregoing embodiment,
[0147] The optical axis of the close-up camera 501 is on the driving route of the vehicle under test, and images are collected at a preset frequency and sent to the monitoring machine 503;
[0148] The supplemental light source 502 is used to supplement the brightness of the close-up camera 501 when the light is insufficient;
[0149] The monitoring machine 503 is used to calculate the license plate running trajectory of the multi-frame images sent by the close-up camera 501, determine whether the license plate running trajectory is correct, and select the multi-frame image with the correct license plate running trajectory as the image group to be analyzed; Analyze the license plate imaging distance of the multip...
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