Under the surveillance camera, the Devil Road Section

The special camera for road surveillance license plates was a mobile camera device with a high-speed camera. Within a certain range of road surveillance, for slow-moving vehicles, they could steadily and clearly capture colorful license plates, bodies, and other moving objects under various lighting conditions. Its characteristics included: The horizontal TV has a high definition, some can reach 700 lines; it uses specific camera components such as the original Sony-produced Super HAD CCDs; it has a unique digital noise reduction technology, which can effectively reduce the gain noise in low-light conditions to obtain clear images; it has a digital wide dynamic compensation function, which can also have clear images in backlit situations with large light contrast; The strong light suppression function can block the bright areas in the scene and increase the visibility of other areas. When the high beam lights of the car are turned on, the light can be blocked to identify the license plate. The strong light suppression can be selected to work all day or at night. The shutter speed can be adjusted to meet the needs of different vehicle speeds. There are multiple focal length automatic aperture lenses to meet the needs of license plate recognition at different distances. The camera can be controlled by local buttons or remote RS485 adjustment menu, which is convenient to use. The starting time and brightness of the array white light lamps could be adjusted. The starting time delay of the white light lamps could prevent repeated movements due to external light interference. Some of them also had built-in heater and fan, which could automatically control the temperature to be turned on and off to adapt to a wide temperature range. Its working principle was to convert optical image signals into electrical signals. When shooting an object, the light reflected by the object is collected by the camera lens and focused on the light-receiving surface of the camera device. Then, the light is converted into electric energy by the camera device to obtain a video signal, which is amplified by the pre-amplifier circuit, and then processed and adjusted by various circuits to obtain a standard signal, which can be used for recording, transmission or display. Different types of license plate cameras had different functions. For example, some smart license plate cameras could work within a 30-meter road monitoring range. The brightness of the lights could be smoothly adjusted through remote control buttons or remote RS485 to achieve smart license plate monitoring with the car lights on and off. There was also Zhongwei Century's license plate recognition camera. It was affordable and had a variety of functions. It could recognize the license plate number, car color, and license plate type. It came with a certain amount of computing power and a built-in memory card. It was easy to use, and the recognition speed was basically no problem during the day. At night, it could also see the license plate under poor conditions such as the high beam lights of the car. Although it could only recognize vehicles driving below 60 kilometers per hour, it could be connected to an app alone, or it could be connected to a computer client or a hard disk recorder. It could also customize functions according to needs. Appearance, parameters, etc. These cameras were mainly used at toll stations, entrances, toll gates, and other places. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The country did not have a unified regulation on the length of time the road surveillance cameras could keep their recordings. The duration of the surveillance video recording was usually between one week and January, but it could not be less than one week. With the development of technology and the update of storage equipment, most of the previous front-end storage was now changed to central storage. The design parameters were no less than one month, and some places could reach three months or even half a year. Taking Hangzhou as an example, if the traffic violation of motor vehicles that had been monitored and seized had not been dealt with, it would be retained for a long time; if it had been dealt with, it would be retained for three months. If one only wanted to check which cars passed by this intersection at a certain time, such continuous normal surveillance would usually be kept for fifteen days unless there were special circumstances. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following are some application cases of license plate recognition for road surveillance cameras: 1. ** Car park management ** - In the parking lot, the license plate recognition system was used to distinguish between monthly rental owners and temporary parking vehicles. For example, the Haoyue license plate recognition machine launched by Aike Zhibo was applied to the parking lot license plate recognition system. When the car entered the parking lot, the system accurately identified the license plate, protected the interests of the monthly rental car owners, and ensured the order of the parking lot. Different types of parking lot lanes had different camera installation and recognition modes. - On the straight lane, the parking lot license plate recognition system and the gate were installed on the same side of the lane, and the recognition system was at least 30cm away from the gate. The ground sensor coil and the recognition system maintained a suitable distance (4m for capture or video recognition, 3m for video plus ground sensor recognition) to achieve accurate license plate recognition. - If the wide lanes could not be separated, dual cameras could be installed to ensure that the license plate could be photographed regardless of the direction of the vehicle. When the curve was installed, the license plate recognition system was installed on one side of the periphery of the lane to adapt to the situation where the vehicle's driving direction pointed to the outside of the curve, ensuring that the license plate could be accurately photographed and identified when the vehicle entered the recognition area. During the installation of the basement, the identification system at the entrance was installed on the level road above the basement ramp, and the exit was installed on the level ground below the basement ramp to prevent the vehicle from being trapped on the basement ramp when the all-in-one machine could not recognize the license plate. 2. ** Management of traffic violation and charging ** - For example, the Beijing Transportation APP used the license plate recognition function of the road surveillance camera to manage and charge parking vehicles. However, there were also some problems, such as the possibility of identification errors, which would cause the wrong license plate to be recognized as the owner's license plate, resulting in wrong charges, such as the confusion of the numbers "1" and "7" and the misreading of the letters "J" and "A". 3. ** Vehicle traffic management ** - In some places, different license plate recognition modes were selected according to different needs. For example, the ground sensing recognition mode is used for scenes that require precise control of the parking position of the vehicle; the video detection recognition mode is suitable for places with high requirements for the smooth flow of vehicles; the ground sensing + video detection recognition mode is suitable for places with strict requirements for vehicle traffic control. These modes ensured the orderly and efficient passage of vehicles in different scenarios. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The pinhole monitor was the smallest and most convenient monitor. It could be installed in a hidden place and was not easily discovered. If there was an internet connection, it could also be used for remote monitoring. In terms of size, the world's smallest SS-L1475 camera was about 4.4mm in diameter and 15mm in length. It could shoot 320x240-pixel-QVP video and had an LED flash at the top. In addition, there were some miniature monitors on the market that were less than the size of a jelly bean and could be easily placed in the palm of one's hand or hidden in other objects. However, these miniature monitors were usually used for security monitoring or spying. There was also a 12 * 12mm ultra-miniature color camera. Its appearance and workmanship were exquisite and beautiful. The wires were precise, and the structure was rigorous and reasonable. It was extremely convenient to install and use. It was small, flexible, and had low illumination. It could be carried around. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The brands in the security surveillance camera industry mainly included Seiko, Tenglong, Computar, Fujineng, Tuli, and so on. In addition, there were also Hikvision, EZVI, Dahua, 360, KEDA, Philip, Samsung, D-Link, Ithink, Jooan, VStarcamera, Huamai, Datang Bodyguard, lenova, Huaxin, Anda, Shibojia, Tianshida, Aochman, Tiandi, Longse, Hengsi, Luowice, Transcendence, Watec, Gangqi, Zhongtian Lingzhi, Hongxiang, and other manufacturers. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The surveillance camera was just a single video capture device. The resolution and resolution of the lens were higher than that of the computer's video head, but it could not catch up with professional digital cameras or DVs. In reality, cameras and lenses were mostly purchased separately. The user can calculate the focal length of the lens according to the size of the target object and the distance between the camera and the object to determine the required lens. The lens required by each user depends on the actual situation. It cannot be assumed that the camera (head) already has a lens and does not need to be equipped with another lens. The focal length of the lens determined the field of view of the camera. For example, a wide-angle lens was suitable for shooting in a large space and could capture more content. A telephoto lens was suitable for long-distance shooting and could see details in the distance. Indoors, they usually chose short focal lenses, such as 2.8mm or 3.6mm lenses, while outdoors, they chose lenses based on distance. Moreover, different focal length lenses had different imaging effects. Long focal length lenses could see more details of distant objects, but the field of view became smaller and the viewing range became narrower. Wide-angle lenses had a wide viewing range, but it might be difficult to distinguish some details. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The video surveillance on the highway might have a camera function. For example, the violation camera was generally spherical in shape. Its function was to capture and punish the captured vehicle. Many traffic accidents were caused by parking violation. This kind of camera was installed in the no-parking section, and it was also installed in the parking area of the highway bus. Electronic eyes were used to detect illegal behavior while driving, such as running red lights, changing lanes, etc. Although there was no explicit mention of taking photos, detecting these behaviors usually required taking photos for evidence. Therefore, there were video surveillance cameras on the highway. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

If it was a general non-integrated surveillance camera, the method of adjusting the focal length was as follows: First, remove the camera, check the small screw like parts at the lens and loosen it, then turn the circle on the lens to adjust the focal length. When adjusting the focal length, it was best to take it off and adjust it while facing the monitor screen. If it was inconvenient to take it off, two people were needed. One person looked at the screen and cooperated with gestures or words, and the other person adjusted it next to the camera to achieve the best effect. It could also be adjusted manually. Some surveillance cameras had two buttons that could be rotated. One was used to adjust the distance and the other was used to adjust the clarity. There was another adjustment method: first loosen the fixing screw of the camera's rear focal length adjustment ring; adjust the zoom lens to the maximum telephoto position, and use the focal length adjustment ring on the lens to set the focal length until the image is the clearest; then adjust the zoom lens to the maximum wide-angle position, and turn the rear focal length adjustment ring until the image is the clearest; when switching from telephoto to wide-angle, repeat the above two steps until the image is in focus; finally, after the setting is complete, tighten the rear focal length adjustment ring. In addition, he added a new experience of adjusting the lens. He loosened the screw that fixed the standard lens, adjusted the magnification, and adjusted the lens to a telephoto state. Then, he zoomed in on the distant object, and then adjusted the focal length to make the close-up image clear. Then, he pulled the lens back to the wide-angle state by zooming out. The image he just shot should be a panoramic view. Don't adjust the focal length of this panoramic view (even if the image is blurry, don't adjust it). Go straight to the next step, which is to adjust the back focal length to adjust the image to the best picture. Finally, tighten the small screw of the lens, and the back focal length adjustment is completed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

He only mentioned that the "surveillance camera 12mm" was rather vague and did not know the specific content of the problem. If it was a surveillance camera with a 12mm lens, from the reference, the surveillance camera with a 12mm lens could monitor a distance of 50 meters. For example, there was a 1200-line security equipment infrared night vision surveillance camera, and a high-definition array camera was a 12mm lens. The reference price was 388. Different focal lengths would affect the field of view of the camera. The 12mm lens was a telephoto lens, suitable for long-distance shooting and able to see details in the distance. However, it might not be suitable for indoor surveillance. Usually, 2.8mm or 3.6mm lenses were chosen indoors. If it was outdoor monitoring and needed to monitor a long distance, a 12mm lens could be considered. At the same time, when choosing a surveillance camera, in addition to the lens, it was necessary to consider the networking method, the resolution, the video storage method, indoor and outdoor use, the power supply method, the voice intercom, and many other factors. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were many types of surveillance wires in the surveillance camera accessories. For example, the monitoring accessories such as the Ego BMC to RV male cable, the video cable, and the BMC to LV cable were priced at 2.95 yuan. There was also Coffey's Android data cable that could be used as a camera power extension cable. There were different lengths of 2 meters, 3 meters, 5 meters, and 10 meters to choose from. The 5-meter-long Android ladder was suitable for mobile phones/surveillance cameras, etc. The Chao Fan was suitable for the Xiaomi camera power extension cable of 3 meters, which could be used for Fluorites, Le Orange, 360, Huawei, Little Ant, Xiaobai, Pulian TP-Link, Dahua cameras. There was also an outdoor power supply extension cable of 5 meters that could be used for the standard 2K outdoor battery of the Xiaomi 2 cloud platform version, the new version of the surveillance camera's Class-C charging cable, data cable, and so on. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>