High-definition video camera is a kind of camera equipment, then we need to look at what indicators when choosing a camera, let's learn.
1. Optical zoom When selecting the HD camera magnification, do not consider the distance to watch in multiples, do not choose the maximum focal length of the lens, such as 16 times the integrated camera (up to 63mm) there is no 8-80mm 10x three variable lenses (up to 80mm) look far. In addition, when selecting the magnification, the optical zooming should be the main reference, and the electronic zooming should not be taken into account because the electronic zooming is performed under the premise of reducing the sharpness of the image.
2, wide dynamic range If the HD camera CCD can only be bright and soft environment HD, but the high-contrast environment "can not see clearly", it can only be considered pseudo HD. Wide dynamic technology is a technique that allows the camera to see the characteristics of the image under very strong contrast, which solves the problem that the dynamic range of the image sensor is narrower than the human eye. When a high-luminance area illuminated by a strong light source (daylight, lamps, or reflection, etc.) and an area with a relatively low relative brightness such as shadow and backlight are simultaneously present in the image, a bright area of ​​the image output from the camera will appear white due to overexposure. The dark area becomes black due to underexposure, which seriously affects the image quality. The limitation of the performance of the camera in the brightest area and dark area in the same scene is limited by the “dynamic range†normally mentioned. A wide dynamic camera is more than a dozen times larger than a traditional camera with only a 3:1 dynamic range, allowing you to see clearly at dawn, dusk or cloudy days, and it has become one of the performance indicators of a high-definition camera.
3, multi-stream technology can be transmitted through three types of encoders (MJPEG, MPEG-4 and H.264) HD monitoring is often not a big problem, the problem is that the access of high-definition images requires a lot of hard drives, adding a lot cost. Multistreaming technology provides customers with a variety of applications. MJPEG provides high-quality monitoring and recording in common image formats, while MPEG-4 or H.264 provides real-time high-quality surveillance. This mode of division of work not only saves a lot of hard disk access space, but also records what we need in high-definition “frame†frames. More and more high-definition surveillance cameras on the market are adding this technical parameter, which greatly saves customers' access costs and has become one of the important performance indicators of high-definition cameras.
4. The wide dynamic range technology mentioned earlier in the day and night model allows the camera to be seen clearly in poor light conditions during the day, but what about the environment where there is no light at night? People quickly thought of using Sensor's technology for sensing infrared light, enabling a high-definition camera to capture objects in bright colors during the day and automatically turn into high-sensitivity black-and-white cameras by night, even in dark corners. With tiny details, it is a very good HD camera. This kind of day-and-night function has also been increasingly taken into account by the market, because nights are often the moment when crimes occur. If you don't have HD cameras with day-night shooting, it's equivalent to only half-legs.
5, motion detection & alarm buffer function In order to facilitate management, need to have image matrix display function, convenient for monitoring personnel to analyze and process the feedback signal. It is also necessary to combine motion monitoring with time monitoring and alarm management functions. This intelligence avoids mistakes caused by human negligence. The alarm buffer function saves the video image recorded during the alarm on the transmission line in the memory, preventing the loss of the image data, even if the image transmission is delayed due to broadband restrictions or network traffic problems.
Understand these performance indicators of high-definition cameras, we will not blind in the future when purchasing, you can combine their own needs, in accordance with these performance indicators to choose the right price for their own relatively high camera.
1. Optical zoom When selecting the HD camera magnification, do not consider the distance to watch in multiples, do not choose the maximum focal length of the lens, such as 16 times the integrated camera (up to 63mm) there is no 8-80mm 10x three variable lenses (up to 80mm) look far. In addition, when selecting the magnification, the optical zooming should be the main reference, and the electronic zooming should not be taken into account because the electronic zooming is performed under the premise of reducing the sharpness of the image.
2, wide dynamic range If the HD camera CCD can only be bright and soft environment HD, but the high-contrast environment "can not see clearly", it can only be considered pseudo HD. Wide dynamic technology is a technique that allows the camera to see the characteristics of the image under very strong contrast, which solves the problem that the dynamic range of the image sensor is narrower than the human eye. When a high-luminance area illuminated by a strong light source (daylight, lamps, or reflection, etc.) and an area with a relatively low relative brightness such as shadow and backlight are simultaneously present in the image, a bright area of ​​the image output from the camera will appear white due to overexposure. The dark area becomes black due to underexposure, which seriously affects the image quality. The limitation of the performance of the camera in the brightest area and dark area in the same scene is limited by the “dynamic range†normally mentioned. A wide dynamic camera is more than a dozen times larger than a traditional camera with only a 3:1 dynamic range, allowing you to see clearly at dawn, dusk or cloudy days, and it has become one of the performance indicators of a high-definition camera.
3, multi-stream technology can be transmitted through three types of encoders (MJPEG, MPEG-4 and H.264) HD monitoring is often not a big problem, the problem is that the access of high-definition images requires a lot of hard drives, adding a lot cost. Multistreaming technology provides customers with a variety of applications. MJPEG provides high-quality monitoring and recording in common image formats, while MPEG-4 or H.264 provides real-time high-quality surveillance. This mode of division of work not only saves a lot of hard disk access space, but also records what we need in high-definition “frame†frames. More and more high-definition surveillance cameras on the market are adding this technical parameter, which greatly saves customers' access costs and has become one of the important performance indicators of high-definition cameras.
4. The wide dynamic range technology mentioned earlier in the day and night model allows the camera to be seen clearly in poor light conditions during the day, but what about the environment where there is no light at night? People quickly thought of using Sensor's technology for sensing infrared light, enabling a high-definition camera to capture objects in bright colors during the day and automatically turn into high-sensitivity black-and-white cameras by night, even in dark corners. With tiny details, it is a very good HD camera. This kind of day-and-night function has also been increasingly taken into account by the market, because nights are often the moment when crimes occur. If you don't have HD cameras with day-night shooting, it's equivalent to only half-legs.
5, motion detection & alarm buffer function In order to facilitate management, need to have image matrix display function, convenient for monitoring personnel to analyze and process the feedback signal. It is also necessary to combine motion monitoring with time monitoring and alarm management functions. This intelligence avoids mistakes caused by human negligence. The alarm buffer function saves the video image recorded during the alarm on the transmission line in the memory, preventing the loss of the image data, even if the image transmission is delayed due to broadband restrictions or network traffic problems.
Understand these performance indicators of high-definition cameras, we will not blind in the future when purchasing, you can combine their own needs, in accordance with these performance indicators to choose the right price for their own relatively high camera.
Tile Insert Floor Drain,Tile Insert Floor Drain Cover,Tile Insert Stainless Steel Floor Drain,Black Linear Tile Insert Floor Drain
Kaiping City Jinqiang Hardware Products Co.,Ltd , https://www.jqfloordrain.com