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Video Surveillance Cameras Lens Debugging Method

The surveillance camera is used in the security of the quasi-camera, its pixels and resolution than the computer's video head is higher than the professional digital camera or dv low. Most of the surveillance cameras are just a single video capture device, with little data retention.

Surveillance cameras from the appearance of the main distinction between the gun, hemisphere, high-speed ball, in addition to analog monitoring and IP network monitoring distinction, widely used in schools, companies, banks, transportation, safe city and other security areas.

Use, general camera mainly refers to the network chat for the camera, surveillance cameras mainly refers to the special video surveillance security camera.

First ordinary camera is mainly used for video chat, photography and other activities, used in daily life. The surveillance cameras are mainly used for security checks, real-time control, investigation and evidence collection and a series of security activities. Second, the surveillance cameras are remote wireless control, and the general camera is not.

Function, the main role of the main camera object orientation is clear, usually in the case of the other informed. The surveillance cameras are mainly suitable for real-time monitoring, usually in the object without knowledge or semi-informed circumstances.

Configuration of the different surveillance cameras in order to meet the security needs, usually higher than the ordinary camera pixels and resolution, and some products with anti-glare, anti-vibration, night vision function. At the same time, the biggest advantage of surveillance cameras in the background can be installed a variety of software for security needs. Such as face recognition, automatic tracking, filter, video storage compression.

Use the effect of monitoring the camera and the biggest difference between ordinary camera is the use of different effects. Monitoring cameras in response to security, the need for remote control, long-term uninterrupted monitoring of the target. At the beginning of the design to determine its environmental adaptability is higher than the ordinary camera. Monitoring the lens on the camera is a semiconductor imaging device, which has a high sensitivity, anti-glare, small distortion, small size, long life, anti-vibration and so on.

Lens debugging method

1, the installation of the lens:

Surveillance cameras must be connected with the lens can be used, the general application should be based on the actual situation to match the appropriate monitoring lens, such as fixed focus lens or zoom lens, manual iris lens or auto iris lens, standard lens or wide-angle lens or telephoto lens Wait. Also should pay attention to the lens and digital camera interface, is the C-type interface or CS-type interface, C-type interface and CS-type interface lens thread are 1 inch 32 teeth, 1 inch in diameter, the difference is the lens from the CCD target surface Distance, C-type mount from the datum to the focal point of the distance of 17.562 mm, than the CS-distance CCD target surface more than a dedicated length of the lap, CS from the focal distance of 12.5 mm. Do not underestimate this one ring, if not it, the lens and the network monitoring camera can not be normal focus, the image becomes blurred. So before installing the camera, take a look at the camera and the lens is not the same interface, if not, you need to increase or decrease according to the specific circumstances of the ring. Some cameras do not need to ring, and after the use of like the adjustment ring, adjust, with a screwdriver to loosen the adjustment ring on the screw, turn the adjustment ring, this time the CCD target will be relative to the installation base backward (front) movement, but also play The role of ring. When installing the lens, first remove the protective cover of the surveillance camera and lens, and then gently screw the lens into the camera's lens connector and make it in place. For the auto iris lens, the control line of the lens should also be connected to the auto iris interface of the digital surveillance camera. For the electric two variable lens or the three variable lens, as long as the rotating lens is in place, it is not necessary to correct the balance state It is necessary to correct the equilibrium state after the rear focus is adjusted).

2, adjust the lens aperture and focus:

Close the high-definition digital camera on the electronic shutter and backlight compensation and other switches, the camera will be aimed at monitoring the scene, adjust the lens aperture and focus ring, so that the best image on the monitor. If you are using a camera with a large change in illuminance, it is best to mate the auto iris lens and turn the camera's electronic shutter switch (ELC) OFF. If a manual iris is selected, the camera's electronic shutter switch (ELC) On the ON, and in the application site is the brightest (ambient light maximum), the lens aperture as large as possible and still make the image is the best (can not make the image is too white and overload), the lens is adjusted. Install the protective cover and a good bracket can be. As the aperture is large, depth of field is relatively small, the focus should be taken to the attention of the entire scene as much as possible on-site clarity. When the scene illumination is reduced, the electronic shutter will automatically adjust to slow, with a larger aperture, can still make the image satisfactory.

In the above adjustment process, if you do not pay attention to the bright light when the lens aperture as large as possible, but the switch is relatively small, the security surveillance camera electronic shutter will automatically adjust at low speed, it can still be on the monitor But when the light is dark, the aperture is relatively small, and the electronic shutter has been in the slowest (1 / 50s), and this time the image may be a dark one.

3, the rear focal length of the adjusted focal length, also known as back focal length, refers to when the installation of the standard lens (standard C / CS interface lens), the image can be taken into the image of the CCD image sensor on the target surface, the general The camera in the factory, the back focal length have made the appropriate adjustments, therefore, in the fixed focus lens application, generally do not need to adjust the camera's back focus.

In some applications, it may appear that when the lens focus ring is adjusted to the limit position still can not make the image clear, then you must first confirm the lens interface is correct. If you confirm it, you need to adjust the camera's back focus. According to experience, in the vast majority of surveillance cameras with electric zoom lens applications, often need to digital high-definition camera to adjust the back focal length.

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