How to choose body camera?
Body worn camera is also called police equipment body worn camera or spot body worn camera. It integrates digital technology shooting, digital technology photography, and intercom system microphone. It can intelligently record the dynamic and static data on the spot during the entire inspection process, which is beneficial to the police in various natural environments. Audit application. In addition, the application field of intelligent body worn cameras that can carry out 4G wireless video transmission is more common, and they are widely used in the judicial industry, various outdoor inspection sites, and other scenarios that must be communicated in real time.
So how to choose a suitable body worn camera? You can roughly refer to these places:
The assembly method of body worn cameras is generally fixed on the body of the personnel on duty. There are alligator clips, magnetic back clips, shoulder clips and other accessories on the market. The magnetic back clips are the strongest and are generally difficult to tear off.
Number of cameras
body worn cameras generally have single camera, dual camera and triple camera. Among them, three cameras are more comprehensive. One front camera is used for Selfie and co-shooting; the rear dual camera, one main camera for video recording, and one secondary camera for photo shooting, are mainly used in the background when recording video surveillance in real time. You can also enable the capture function.
There are standard sizes and mini-mini. The advantage of the mini is its lightness, but the disadvantage is also obvious. The battery capacity is small. As for standby, if you have long-term uninterrupted use, you can consider a removable battery
1.5 inch, 2.0 inch, 2.4 inch, no screen, etc. Generally 2.4 is the mainstream and can be touched, this depends on the scene of use
Generally, body worn cameras 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 body worn camera is natural The higher it will be. Generally, you should decide how much running memory to buy according to the image quality of the body worn camera and the record storage of the surveillance camera. The ultra-clear body worn camera 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 format
The resolution and frame rate of video files is an important indicator to measure the quality of body worn cameras. The market for body worn cameras is mainly divided into four types: general definition, high definition, full HD, and ultra definition. HD body worn cameras have 720p@30FPS , 720p@60FPS, 1080p@30FPS, 1080p@60FPS, super clear has 1296P@30FPS. The format that supports H.265 is better than H.264. In the case of the same definition, H.265 takes up less space. Of course, it also requires the platform to support the analysis of H.265 format before it can be played. There are still some computer consumer playback software that do not Support H.265 resolution.
Generally, there are several shooting angles, most of which are adjusted according to the angle of the camera: 90 degrees, 100 degrees, 120 degrees, 140 degrees, 150 degrees, 170 degrees, etc. The mainstream body worn cameras are equipped with a 120-degree or 140-degree wide-angle lens. A single lens basically cannot reach the wide angle of 170 degrees, and even if it reaches 170 degrees, the picture will be severely deformed, which will affect the clarity of the picture.
According to the definition division, there are four types of body worn cameras: 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 illuminated interface.
The body worn camera must have good picture quality and the ability to work at night. The high resolution is determined by the main control chip of the body worn camera. In this case, the buyer must be concerned about the image processing plan of the main control chip of the body worn camera. That is to say, the body worn camera must have sufficient storage space to maintain reasonable long-term recording.
The image processor file formats of mainstream products are MOV, avi, and H.264 file formats. If the body worn camera 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 body worn camera 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.