Video surveillance lens type introduction

What is <br> <br> surveillance camera surveillance camera surveillance camera lens means that, due to the surveillance cameras just a single video capture device, camera pixels and resolution is higher than the computer's video head but can not keep up professional digital camera or Dv. In the closed-circuit monitoring system, the camera is also called a camera or a charge coupled device (CCD). Strictly speaking, the camera is the general name of the camera and the lens, the camera's primary sensing component is the CCD, it has a high degree of rapidity, small distortion, long life, anti-vibration, anti-magnetic field, small size, no residual image and other characteristics, CCD is An abbreviation of Charge Couple Device, which can change the gloss into a charge and store and transfer the charge, and can also take out the stored charge to change the voltage. Therefore, it is an ideal imaging device. It is a new device that replaces the camera tube sensor.

Choosing the lens The first thing to notice is the focal length of the lens. The focal length is actually the angle of view and the focal length is different. In addition, users should make it clear that what is the main purpose of my lens purchase? Is it for shooting scenery or shooting people? As we all know, it is appropriate to use a wide-angle lens for shooting scenery, and the telescope head should be used to shoot people, so we must first determine the focal length of the lens to be purchased according to the purpose of photography.

The camera lens has many different classifications according to different technical parameters and applications. Each classification can meet different monitoring needs. The following is a simple surveillance camera lens classification...

Type of surveillance camera

According to the different types of applications, the types of surveillance cameras can be divided into the following types:

1. Wide-angle lens: The angle of view is more than 90 degrees, the observation range is relatively large, and there is distortion in the near image. It is generally used in small-visibility and large-angle locations such as elevator cars and halls.

2. Standard lens: The angle of view is about 30 degrees with a wide range of use. Generally used for walkways and community perimeters;

3. Telephoto lens: within 20 degrees of viewing angle, focal length up to tens of millimeters or hundreds of millimeters. Used for remote monitoring;

4. Zoom Lens: The focal length of the lens can be continuously changed, and the focal length can be changed from wide-angle to telephoto. The longer the focal length is, the larger the image is; and the area with large depth of field and wide range of viewing angles;

5. Pinhole lens: used for concealed observation, often installed in places such as ceilings or walls.

to sum up

The focal length of the surveillance camera refers to the distance between the lens and the sensor. The magnification of the lens is approximately equal to the ratio of focal length to object distance. In other words, with the increase in the focal length of the surveillance camera, the magnification is increased, and the near view can be further extended, and the details of the distant view can be made clearer. For different occasion environments, different uses and different groups of people, we have to choose a relatively appropriate lens, so that not only meet the monitoring requirements, but also the most economical.

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