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The offline body worn camera, as its name implies, is not connected to the network. Video and picture files can only be ...
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Law enforcement recorders originated from the evolution of driving recorders. Products in this industry do not need to b...

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1. What is a law enforcement recorder?


The law enforcement recorder is also called the police video and audio law enforcement recorder or the scene law enforcement recorder. Integrating the functions of digital camera, digital camera, and intercom microphone, it can digitally record the dynamic and static scene conditions during the law enforcement process, which is convenient for public security officers to use in various environments.


At the same time, the application scenarios of smart law enforcement recorders that can carry out 4G wireless video transmission are more extensive, and they are widely used in the field of public security, law enforcement, various indoor and outdoor testing places, and other scenarios that require real-time communication.


Features


Video: With video recording function, it can shoot video, which is the core function of law enforcement instrument. The video resolution is not less than 704X576 or 720X480, the number of frames is not less than 25 frames per second, and the resolution is not less than 320 lines.


Photograph: Support single shooting and continuous shooting.


Recording: audio recording.


Infrared night vision: After the night vision function is turned on, the effective shooting distance is not less than 3m, and the facial features of the characters can be clearly seen. For equipment with infrared supplementary light function, the infrared supplementary light range at 3m should cover more than 70% of the recording screen area .


Digital zoom: zoom in video and take pictures, up to 16 times.


Wide-angle shooting: up to 170° wide-angle.


Graphic playback: browse and playback the stored video, audio, photo and other information in time, format, etc.


Beidou/GPS positioning: It can receive satellite data and provide positioning information. Some 4G models of law enforcement instruments also have the function of querying movement tracks.


Walkie-talkie: The law enforcement instrument can be used to complete real-time calls, and some instruments also have the function of group intercom.


Laser positioning: The law enforcement instrument comes with a laser beam, which can assist in taking videos or photos.


2. The difference between stand-alone and 4G


The stand-alone law enforcement recorder, as its name implies, is not connected to the network. Video and picture files can only be stored in the machine, and then the files are copied to the computer hard disk for storage through the data cable. This method is not conducive to the system management of the files, in order to facilitate After the management, there is a collection station, which can charge multiple units together, import and export files, and classify files, as shown in the following figure:


But as more people's needs are met, manufacturers have introduced 4G law enforcement recorders, which can realize functions such as group intercom, group call, individual, group call, track playback, real-time positioning, real-time video, electronic fence, patrol, etc. With these functions, there will generally be a computer-side command and dispatch platform, as shown in the following figure:


The choice of law enforcement recorder still depends on your needs. If you are using an environment where the signal is poor and the storage capacity is not large, such as mountainous areas, you can consider buying a stand-alone law enforcement recorder and manually perform computer backups on a regular basis. If your usage scenario requires real-time command and dispatch and system management of the overall file, choose the 4G version for functions such as automatic backup.


3. How to choose law enforcement recorder?


Assembly line method


The assembly line method of law enforcement recorder is generally fixed on the body of the staff on duty. At present, there are alligator clips, magnetic back clips, shoulder clips and other parts on the market. Among them, the magnetic back clips are more firm and generally cannot be Pull it out.


Total number of surveillance cameras


Law enforcement recorders usually have people order single shooting, double shooting and triple shooting. Among them, the three surveillance cameras are more omnidirectional. One front camera is used for selfies and cooperation; the rear dual camera has a main camera for video recording and a secondary camera for photo shooting. This scenario is suitable for background management in real-time In the case of video surveillance, you can turn on the function of video recording.


Appearance specifications


There are standard and mini-types. The advantages of the mini-type depend on the lightness, but the disadvantages are also significant, and the battery power is small. For shutdown, if there is a long-term continuous application, consider the removable rechargeable battery


Display size


1.5 inch, 2.0 inch, 2.4 inch, no display, etc. Generally 2.4 is the mainstream product, which can be touched, this also depends on the application scenario


Memory space


Generally, law enforcement recorders do not have built-in running memory, and they have to be expanded by memory cards. If it is MicroSD card expansion or SD card expansion, the volume is 8G, 16G, 32G, 64G, 128G; it can meet the needs of customers with greater video storage requirements, according to their needs, the larger the running memory, the price of the law enforcement recorder is natural The higher it will be. Generally, you should decide how much running memory to buy according to the image quality of the law enforcement recorder and the record storage of the surveillance camera. The ultra-clear law enforcement recorder has 720p and 1080p, and the 16G card records 720p video. It can only record video for 4 hours, and the indoor space occupied by 1080p video is nearly twice that of 720p. There are also memory cards that generally need to choose a high-speed card class10, otherwise the video recording will be terminated.


Video resolution and file format


The resolution and frame rate of the audio file is a key indicator value to consider the image quality of law enforcement recorders. The sales market for law enforcement recorders is divided into four types: general, ultra-clear, high-definition, and high-definition. Ultra-clear law enforcement recorders have 720p @30FPS, 720p@60FPS, 1080p@30FPS, 1080p@60FPS, HD has 1296P@30FPS. The file format suitable for H.265 is better than H.264. Under the same picture quality, H.265 occupies less indoor space. Naturally, the service platform must apply and analyze the H.265 file format to be able to broadcast. There are still some computers for consumption. The sex player is not compatible with H.265 analysis.


Shooting technique


There are several general shooting methods, most of which are adjusted based on the viewing angle of the surveillance camera: 90 degrees, 100 degrees, 120 degrees, 140 degrees, 150 degrees, 170 degrees, etc. The law enforcement recorders of mainstream products are equipped with 120-degree or 140-degree ultra-wide-angle lens. A single wide-angle lens can't reach the 170-degree wide-angle lens. Even if the 170-degree interface is achieved, it will be more severely deformed, which will harm the clarity of the interface.


Video clarity


According to the definition division, there are four types of law enforcement recorders: 300,000 resolution, 1.3 million resolution, 2 million resolution, and 5 million resolution. Some of them indicate 12 million, 36 million, and 48 million resolutions that refer to static data photography. It is not the video clarity value.


Summary: Surveillance cameras should use a larger shooting technique, which is beneficial for all-round recording of nearby conditions. However, it should be noted that the angle of view of the wide-angle lens should not be too exaggerated to prevent distortion of the photographed interface.


The law enforcement recorder must have good picture quality and the ability to work at night. The high resolution is determined by the main control chip of the law enforcement recorder. In this case, the buyer must be concerned about the image processing plan of the main control chip of the law enforcement recorder. That is to say, the law enforcement recorder must have sufficient storage space to maintain reasonable long-term recording.


The image processor file format of mainstream products is MOV, AVI, H.264 file format. If the law enforcement recorder can't reach 30 frames per second, the video will be stuck and not smooth in the 1080P shooting mode. In the 720P shooting mode, at least 24 frames per second that human eyes can blend into, can see a smooth and clear video interface.


According to the law enforcement recorder requirements of the National Compulsory Certification Quality Center, all must pass 3C verification before they can be sold on the market. Therefore, shop buyers must choose carefully when choosing well-known brands, and purchase the products made by reliable manufacturers with 3C verification to ensure safety.


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