In Select Security monitoring What factors need to be taken into consideration when making system shots?
The camera is video camera Its performance is directly related to whether the camera picture is clear. The camera is very important in the computer room video monitoring system. Therefore, in order to maximize the efficiency of the camera, in addition to the excellent design of the camera's own camera components and circuits, it is also necessary to select an appropriate lens for it. So what factors should we consider when selecting security monitoring system lens?
1. Lens focal length
When considering the lens index, it is necessary to comprehensively consider the position, distance, CCD specification of the monitoring target, and the image effect of the security monitoring target on the monitor to select a lens with appropriate focus. If it is necessary to monitor nearby objects, and the requirements for clarity are high, the effect of the fixed focus lens is generally better than that of the zoom lens, so the short focus fixed focus lens is usually selected, and indoor computer room monitoring is more applicable.
2. Field angle range
In short, the larger the focal length is, the farther the monitoring is, and the smaller the field angle is; The smaller the focal length, the closer the monitoring distance and the larger the field angle. For example, in some projects requiring manual zoom lens, the field angle range needs to be considered first, so the selected focus range is generally determined according to the field angle range. Small indoor machine room security monitoring is optional. Because the electric zoom lens can control zoom and focus with the keyboard at any time according to the on-site environment, the field of view angle range is not too important to consider. However, when the initial focal length of the electric zoom lens is too large (for example, the initial focal length exceeds 20mm), large-scale monitoring cannot be achieved.
3. Aperture of lens
The luminous flux of the lens is measured by the ratio of the focal length of the lens and the luminous aperture (F=f/D), marked with F. Each lens is marked with its z large F value. The smaller the F value, the larger the aperture. For the environment with constant lighting conditions, the lens with fixed aperture can be selected, generally in the laboratory environment; For the environment where the change of light intensity is not obvious, use a manual aperture lens, that is, adjust the aperture to an ideal value and then fix it; If the illuminance changes greatly and 24-hour outdoor monitoring is required, automatic aperture lens shall be selected.
Wuxi Dehang Technology Co., Ltd., founded in 2010, is a computer network system integration and weak current engineering service company in z industry.
For many years, the company has been committed to information system integration, Internet/Intranet software development, building a technical service network covering the whole country, and providing a complete set of solutions for large, medium and small users such as early planning, scheme design, application development, system installation, debugging and personnel training of information systems and weak current systems. So far, it has provided hundreds of large and medium-sized computer network systems and weak current engineering solutions in the fields of finance, insurance, securities, power, banking, civil aviation, railway, water conservancy, petrochemical, national defense, customs, telecommunications, scientific research institutions, etc.
