How to choose a body camera?
Body camera is also called police equipment Body worn camera or body camera on the spot. It integrates digital technology photography, digital technology photography and intercom system transmitter, which can intelligently record dynamic and static data on the spot in the whole process of inspection, and is conducive to the inspection application of public security police in various natural environments. In addition, the application field of intelligent body camera that can carry out 4G wireless video transmission is more common, and it is widely used in the judiciary industry, various outdoor inspection sites and other situations that must be immediately communicated.
How to select a suitable body camera? You can roughly refer to these places:
Assembly method
The body camera is generally fixed to the staff on duty. There are crocodile clips, magnetic back clips, shoulder clips and other accessories on the market, among which the magnetic back clip is the most solid and is difficult to tear off.
Number of cameras
Body camera generally includes single camera, double camera and three cameras. Among them, three cameras are more comprehensive, and one front camera is used for self taking and co shooting; One main camera is used for video recording and one sub camera is used for photo shooting. This scene is mainly used for background video monitoring during real-time recording, and the capture function can also be enabled.
Appearance standby
There are standard size and mini size. The advantage of mini size is light weight, while the disadvantage is obvious. The battery capacity is small. As for standby, consider removable batteries if they can be used continuously for a long time
Screen size
1.5 ", 2.0", 2.4 ", no screen, etc. Generally, 2.4 is the mainstream and can be touched, depending on the usage scenario
Memory capacity
Generally, the body camera does not have embedded running memory, which needs to be expanded by the memory card. In case of MicroSD card expansion or SD card expansion, the volume is 8G, 16G, 32G, 64G, 128G; It can meet customers' needs for greater video storage. The larger the operating memory is, the higher the price of the body camera will naturally be. Generally, it is necessary to decide how much operating memory is appropriate according to the image quality of the body camera and the record storage of the monitoring camera. The ultra clear body camera has 720p and 1080p, and the 16G card record 720p video can only be recorded for 4 hours, 1080p video occupies nearly twice as much indoor space as 720p video. There are also storage cards that generally need to choose the high-speed card class10, otherwise the video recording will be terminated.
Video resolution and format
The resolution and frame flow rate of video files are an important indicator to measure the image quality of the body camera. The body camera market is mainly divided into four types, namely, universal definition, high-definition, full high-definition and ultra definition. The high-definition body camera has 720p@30FPS 、 720p@60FPS 、 1080p@30FPS 、 1080p@60FPS Yes, ultra clear 1296P@30FPS 。 The format supporting H.265 is better than H.264. In the case of the same definition, H.265 takes up less space. Of course, the platform needs to support parsing the H.265 format before it can be played. Some computer consumer playback software does not support parsing the H.265 format.
Shooting angle
Generally, there are several shooting angles, most of which are adjusted according to the camera angle: 90 degrees, 100 degrees, 120 degrees, 140 degrees, 150 degrees, 170 degrees, etc. Mainstream body cameras are equipped with 120 degree or 140 degree wide-angle lenses. A single lens is basically less than 170 degrees wide. Even if it reaches 170 degrees, the picture will be severely deformed, which will affect the clarity of the picture.
Video Pixels
According to the definition division, there are four types of body cameras: 300000 definition, 1.3 million definition, 2 million definition, and 5 million definition. Some of them indicate that 12 million, 36 million, and 48 million definition refer to static data photography, not video definition values.
Summary: The shooting method of the surveillance camera should be larger, which is beneficial to the all-around recording of nearby conditions. However, it should be noted that the angle of view of the wide-angle lens should not be too grandiose to prevent the interface from being deformed.
Body camera should have good shooting picture quality and the ability to shoot at night. The high pixel is determined by the main control chip of the body camera. In this case, the car buyer must be concerned about the image processing plan of the main control chip of the body camera. In other words, the body camera must have enough storage space to keep a reasonable long-term camera.
The file formats of image processors of mainstream products are MOV, avi, H 264 file format. If the body camera fails to reach 30 frames per second, the video will be jammed in the 1080P shooting mode. In the 720P shooting mode, at least 24 frames per second that the human eye can blend into must be achieved to see the smooth and clear video interface.
According to the requirements of the Body Camera of the National Compulsory Certification Quality Center, all products must pass the 3C verification before they can be sold in the market. Therefore, when selecting famous brands, store buyers must be careful to select them, and 3C verification is available to ensure safety.
