Principle of taking pictures at the intersection of carsThe principle of taking photos at a car intersection was as follows:
1. ** Sensing line sensing pressure **: The electronic eye uses the sensing line to sense the pressure of the car on the road. The signal is collected by the sensor and sent to the central processor. The collected information will be sent to the register for temporary storage (the data is valid for a red light cycle). Within the same time interval (red light cycle), if two pulse signals are generated at the same time, it is considered "effective". For example, when the front wheel crossed the line and the rear wheel did not, only one pulse was generated, and no photos were usually taken. However, if the front wheel crossed the line and then reversed back into the line, a pair of pulse signals (this pair of pulses was generated in the same red light cycle) would be taken.
2. ** Real-time camera recording **: The camera will record speeding, running red lights, and illegal parking in real time. Some cameras would bury an induction coil underground, and electronic monitors would sense the situation of the vehicle through the induction wire to capture the car that ran the red light.
3. ** Picture taken to confirm the situation of running a red light **:
- Usually, three photos of a car that violated the traffic rules would be recorded as running a red light. One was an instant violation photo, one was a license plate recognition photo, and the last was a panoramic photo. For example, when a car ran a red light, the first photo might be the front wheel crossing the police line, the second one the rear wheel crossing the police line, and the third one the police line crossing the opposite intersection.
- When the car passed the traffic light, if the car just crossed the stop line when the red light was on, it needed to stop immediately. Because the surveillance system would not capture three illegal photos, the traffic police department would not punish it, but it could not reverse.
- When the yellow light was on, the camera system would start after a delay of 2 seconds; when the red light was on, the system had already started; when the green light was about to light up, the system would be turned off 2 seconds in advance to prevent accidental shooting.
4. ** Electronic fill light flashing **:
- [Flash: The capture process of the electronic eyes is usually forensics, analysis, confirmation, and uploading to the MDT.] If it only flashed once when passing through the camera (when passing through a row of cameras, it might appear as several fill lights flashing at the same time), this was a pre-photo taken by the electronic eye when it recognized the passing vehicle. The fill light filled it in advance to take a bright and clear photo, which was the original evidence for the second conviction of the illegal act.
- Two flashes: If the fill light flashes twice when driving through the electronic eyes, it means that two photos have been taken. At this time, it was necessary to reflect on whether there were illegal driving behaviors, such as squeezing lines, driving to pick up mobile phones, or rushing yellow lights (running red lights). Under normal circumstances, only one photo would be taken when a car passed by the electronic camera. If two photos were taken, it might be the system evaluating whether the driving behavior was suspected of violating the rules. Once the analysis was confirmed, it would be uploaded to the traffic control department's vehicle violation information system. In addition, flashing twice might also mean that it was continuously identifying nearby vehicles, creating the illusion that it had been photographed twice.
- Three flashes: Electronic eye flashes usually only occur on the highway or when a car runs a red light. If it flashed three times on the highway, it meant that the electronic eye was taking photos. If the fill light flashed three times when passing through the intersection in the city, it meant that it was likely to be recorded illegally for running a red light.(The first time it appeared when the red light was on, the vehicle had just crossed the stop line. The second time it appeared when the red light was on, the vehicle was passing through the intersection. The third time it appeared when the red light was on, the vehicle had already passed through the intersection.)
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2025-09-14 11:04
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