1. Selection of manual and automatic iris lenses The selection of manual and automatic iris lenses depends on whether the ambient illumination is constant or not.
For the case of constant ambient illumination, such as in elevator cars, closed corridors, and rooms without direct sunlight, a manual iris lens can be selected. This allows for a one-time setting based on the actual illumination of the environment during the initial installation and commissioning of the system. Lens aperture size, get a satisfactory brightness screen.
For situations in which the ambient illumination is constantly changing, such as in halls, windows, and lobbies where the illumination varies greatly with daylight hours, an automatic iris lens (must be equipped with a camera with an auto iris lens socket) is required. Realizes the automatic adjustment of the brightness of the picture, and obtains a good monitor picture with a relatively constant brightness.
For automatic iris lens control signals can be divided into two kinds of DC and VIDEO control, that is, DC voltage control and video signal control. This applies to the type of automatic iris lens, the connection mode of the camera's automatic iris lens socket, and the switch of the drive mode of the automatic iris lens.
2. Selection of Fixed Focus and Zoom Lens The selection of fixed focus and zoom lens depends on the size of the monitored scene range and the clearness of the scene of the scene being monitored.
When the lens specification (the lens size is generally divided into 1/3′′, 1/2′′, and 2/3′′, etc.), the relationship between the focal length of the lens and the angle of field of the lens is: the longer the lens focal length, the field of view of the lens The smaller the angle is (see Figure 1), the relationship between the lens size and the field of view of the lens in the case of a fixed focal length of the lens: the larger the lens size, the larger the field of view of the lens. It can be seen that in the case that the lens object distance is constant, as the lens focal length becomes larger, the screen area of ​​the monitored scene seen on the end monitor of the system is smaller, but the picture details become clearer; With the increase of the lens specification, the screen area of ​​the monitored scene seen on the end monitor of the system increases, but the details of the screen become more and more blurred, and the CS type interface lens is provided under the premise of fixed lens focal length and focal length. The field of view will be greater than the field of view of the Type C interface lens.
The angle of view of the lens can be divided into the horizontal angle of view of the image and the vertical angle of view of the image, and the horizontal angle of view of the image is larger than the vertical angle of view of the image. Usually, the angle of view we are referring to generally refers to the horizontal angle of view of the lens image. .
In narrow monitored environments such as elevator cars, narrow rooms should use short-focus wide-angle or ultra-wide-angle prime lenses, such as the optional lens size 1/2′′, CS interface, lens focal length of 3.6mm or 2.6mm The lens, the lens field of view angle is not less than 99 ° or 127 °, which for the camera in a small space in the general elevation of about 2.5m, the camera's field of view angle range is sufficient to cover the entire close range of small monitored space. According to the actual situation of the scene, choose manual zoom lens such as Nissan ComputarT2Z2814CS-2 lens, this lens is 1/3′′CS type interface manual iris lens, its focal length is 2 times adjustable (manual focus). The focusing range is 2.8 to 6.0 mm, and the field of view angle varies from 96° to 47.2°. This type of lens is ideal for use in a narrowly monitored environment. When used, it can be easily and conveniently monitored according to actual needs. The "point" or "face" of the scene is monitored.
For a general zoom lens, since its minimum focal length is usually about 6.0 mm, the maximum angle of view of the zoom lens is about 45°. Such a lens is used for such small surveillance. In the environment, the monitoring dead angle will inevitably increase. Although the front-end pan/tilt can be operated and controlled to reduce this monitoring dead angle, this will increase the engineering cost of the system (the system needs to increase the front-end decoder, PTZ, and protection Covers, etc., as well as the complexity of system manipulation, so in this environment, it is not appropriate to use a zoom lens.
In an open and monitored environment, firstly, according to the openness of the monitored environment, the degree of clarity of the screen of the monitored scene that the user requests to see on the end monitor of the system, and the center point of the monitored scene should be between the camera lenses. The straight line distance is the reference, and in the case of a straight line distance that satisfies the picture of the entire monitored scene, the long focal length lens should be considered as much as possible so that a monitored scene with clear details can be obtained on the end monitor of the system. Screen. In this kind of environment, you can also consider using zoom lens (electric three variable lens), which can be determined according to the design requirements of the system and the cost performance ratio of the system, and two points should also be considered in the selection: (1) When adjusting to the shortest focal length (see the panorama), the requirement to cover the screen of the main monitored scene should be satisfied; (2) When adjusting to the longest focal length (see details), the requirements for observing the details of the screen of the monitored scene should be satisfied. Generally, 6× or 10× lenses are generally used in indoor warehouses, workshops, and workshops to meet requirements. In outdoor areas such as warehouses, docks, plazas, and stations, 10 can be selected according to actual requirements. Times, 16 times or 20 times the lens can be (normally, the greater the lens multiples, the higher the price, under the premise of comprehensive consideration of system cost, the appropriate selection of high magnification zoom lens).
For the case of constant ambient illumination, such as in elevator cars, closed corridors, and rooms without direct sunlight, a manual iris lens can be selected. This allows for a one-time setting based on the actual illumination of the environment during the initial installation and commissioning of the system. Lens aperture size, get a satisfactory brightness screen.
For situations in which the ambient illumination is constantly changing, such as in halls, windows, and lobbies where the illumination varies greatly with daylight hours, an automatic iris lens (must be equipped with a camera with an auto iris lens socket) is required. Realizes the automatic adjustment of the brightness of the picture, and obtains a good monitor picture with a relatively constant brightness.
For automatic iris lens control signals can be divided into two kinds of DC and VIDEO control, that is, DC voltage control and video signal control. This applies to the type of automatic iris lens, the connection mode of the camera's automatic iris lens socket, and the switch of the drive mode of the automatic iris lens.
2. Selection of Fixed Focus and Zoom Lens The selection of fixed focus and zoom lens depends on the size of the monitored scene range and the clearness of the scene of the scene being monitored.
When the lens specification (the lens size is generally divided into 1/3′′, 1/2′′, and 2/3′′, etc.), the relationship between the focal length of the lens and the angle of field of the lens is: the longer the lens focal length, the field of view of the lens The smaller the angle is (see Figure 1), the relationship between the lens size and the field of view of the lens in the case of a fixed focal length of the lens: the larger the lens size, the larger the field of view of the lens. It can be seen that in the case that the lens object distance is constant, as the lens focal length becomes larger, the screen area of ​​the monitored scene seen on the end monitor of the system is smaller, but the picture details become clearer; With the increase of the lens specification, the screen area of ​​the monitored scene seen on the end monitor of the system increases, but the details of the screen become more and more blurred, and the CS type interface lens is provided under the premise of fixed lens focal length and focal length. The field of view will be greater than the field of view of the Type C interface lens.
The angle of view of the lens can be divided into the horizontal angle of view of the image and the vertical angle of view of the image, and the horizontal angle of view of the image is larger than the vertical angle of view of the image. Usually, the angle of view we are referring to generally refers to the horizontal angle of view of the lens image. .
In narrow monitored environments such as elevator cars, narrow rooms should use short-focus wide-angle or ultra-wide-angle prime lenses, such as the optional lens size 1/2′′, CS interface, lens focal length of 3.6mm or 2.6mm The lens, the lens field of view angle is not less than 99 ° or 127 °, which for the camera in a small space in the general elevation of about 2.5m, the camera's field of view angle range is sufficient to cover the entire close range of small monitored space. According to the actual situation of the scene, choose manual zoom lens such as Nissan ComputarT2Z2814CS-2 lens, this lens is 1/3′′CS type interface manual iris lens, its focal length is 2 times adjustable (manual focus). The focusing range is 2.8 to 6.0 mm, and the field of view angle varies from 96° to 47.2°. This type of lens is ideal for use in a narrowly monitored environment. When used, it can be easily and conveniently monitored according to actual needs. The "point" or "face" of the scene is monitored.
For a general zoom lens, since its minimum focal length is usually about 6.0 mm, the maximum angle of view of the zoom lens is about 45°. Such a lens is used for such small surveillance. In the environment, the monitoring dead angle will inevitably increase. Although the front-end pan/tilt can be operated and controlled to reduce this monitoring dead angle, this will increase the engineering cost of the system (the system needs to increase the front-end decoder, PTZ, and protection Covers, etc., as well as the complexity of system manipulation, so in this environment, it is not appropriate to use a zoom lens.
In an open and monitored environment, firstly, according to the openness of the monitored environment, the degree of clarity of the screen of the monitored scene that the user requests to see on the end monitor of the system, and the center point of the monitored scene should be between the camera lenses. The straight line distance is the reference, and in the case of a straight line distance that satisfies the picture of the entire monitored scene, the long focal length lens should be considered as much as possible so that a monitored scene with clear details can be obtained on the end monitor of the system. Screen. In this kind of environment, you can also consider using zoom lens (electric three variable lens), which can be determined according to the design requirements of the system and the cost performance ratio of the system, and two points should also be considered in the selection: (1) When adjusting to the shortest focal length (see the panorama), the requirement to cover the screen of the main monitored scene should be satisfied; (2) When adjusting to the longest focal length (see details), the requirements for observing the details of the screen of the monitored scene should be satisfied. Generally, 6× or 10× lenses are generally used in indoor warehouses, workshops, and workshops to meet requirements. In outdoor areas such as warehouses, docks, plazas, and stations, 10 can be selected according to actual requirements. Times, 16 times or 20 times the lens can be (normally, the greater the lens multiples, the higher the price, under the premise of comprehensive consideration of system cost, the appropriate selection of high magnification zoom lens).
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