How to choose high-definition digital surveillance camera

Surveillance cameras are widely used in retail stores, supermarkets, units, banks and other places, which can be said to be all over the world. So how should I choose to install one? Here is how to choose a high-definition digital surveillance camera for you. I hope I can help you.

How to choose high-definition digital surveillance camera 1 and understand the requirements?

High-definition cameras are mainly used in financial systems, road traffic monitoring and other places with special requirements for images. These places have high requirements for images, which can clearly see the facial features, license plate numbers and so on. Therefore, if the project you undertake is these application places, you can consider whether to choose this product from the cost.

2, understand the product

At present, cameras with more than 480 lines on the market are positioned as high-definition cameras. In fact, some high-definition cameras with more than 500 lines sold in the market are basically the same as CCD with 480 lines, and the main difference is the video digital processing chip (DSP). Some manufacturers have strong research and development capabilities. They have developed 15? 16-bit video digital processing chip has stronger data processing ability and faster image processing speed than SONY 10-bit chip of 480TVL camera on the market.

3, index detection

In fact, high-definition surveillance cameras with more than 500 lines and more than 480 lines are difficult to distinguish with the naked eye. Therefore, professional testing instruments should be used to test the camera's definition, color reproduction, signal-to-noise ratio, low illumination, synchronization, color synchronization, subcarrier frequency and other technical indicators. Secondly, some scenes can be simulated for testing, mainly to observe static definition, dynamic definition and color reproduction. You can shoot scenes, landscapes, flowers, moving objects and people, and observe whether the picture is clean, noisy and natural.

4. Function

High-definition surveillance cameras are mainly reflected in the clarity of the picture. To achieve the clarity of the picture, not only the horizontal resolution of 540TVL, but also some functions such as wide dynamic, automatic white balance, image clarity adjustment, super digital noise reduction (signal-to-noise ratio), intelligent digital automatic metering compensation and so on.

When testing the wide dynamic function, it is necessary to observe whether the transition between bright area and dark area is clear and natural, and whether the wide dynamic range can be adjusted automatically. A good camera will have rich levels and delicate performance in both bright and dark areas. When you look at the license plate under the headlights at night, the outline, filament and license plate of the headlights are very clear, and there is no vertical bright line. In low illumination, it is necessary to observe whether the monitoring picture of the camera is clear and how noisy it is at night.

5. Operation Settings

Operation setting is mainly based on the convenience of camera parameter setting. At present, the operation settings of high-definition cameras are mainly adjusted through menus and dialing numbers. Cameras with menus need to pay attention to whether the menu functions are rich, whether it is easy to adjust, and whether it can meet different complex monitoring environments.

Chinese menu is more intuitive and easy to use than English menu debugging. At present, some camera menus have standard KTV entertainment places day, day, night and custom modes. You only need to choose a mode, you can easily meet the needs of various complex environments, quickly and conveniently.

6. Data interface

In practical application, due to environmental or man-made damage, the surveillance camera may not work normally. Therefore, when buying a high-definition camera, we should also pay attention to whether its data interface is rich. Observe whether there are alarm interfaces, audio interfaces and RS-485 interfaces on the backplane. Some interfaces can improve the security level of monitoring, and some interfaces can facilitate remote menu call settings.

7. Wide power supply range

In practical engineering, it is often encountered that the power supply is unstable and the camera is burnt out. Especially in some remote mountainous areas, the voltage is high and low, which is very easy to cause the surveillance camera to fail to work normally. At present, most of the power supplies for cameras are DC24V and AC 12V. But some manufacturers' cameras have the function of power redundancy. For example, the standard voltage is AC 12V, but the camera can be set at 9? 16V. The advantage of wide power supply range is naturally highlighted when the voltage is unstable.

8. Installation and debugging

The installation and debugging methods of high-definition camera and ordinary camera are basically the same, but we must pay attention to the choice of lens, because the quality of lens is not good or the choice is not good, which will greatly affect the clarity of the picture. For example, the size of the lens and whether it matches the surveillance camera should be considered. In addition, the back focal plane of the lens should be aligned, and the front glass of the protective cover should be made of good quality optical glass, which will affect the clarity.

9. Support products

In order to obtain high-definition images, the transmission system, intermediate system and terminal display system must meet the requirements of bandwidth and compression in addition to the high-definition camera at the front end, so as to achieve the practical effect of high-definition. Including cable, matrix, hard disk video recorder, video server, various video encoders, etc. Optical fiber cable has the advantages of large bandwidth, small attenuation and strong anti-interference, which can better ensure the indicators of image transmission. It is best to choose progressive scanning display for terminal display equipment, with more than 600 lines. Therefore, it is impossible to achieve the real goal by using high-definition cameras and ignoring the choice of other supporting equipment.

10, technical support

Finally, before choosing a high-definition digital surveillance camera, don't forget to know the technical support of the manufacturer, whether it can provide special technical training and explain the special functions and operation menu of the product in detail, which are the most practical for engineering construction. In addition, if the product can't work normally, it is also very important for the manufacturer to provide corresponding technical services to maintain and repair the product in the shortest time.

The monitoring camera is installed as 1. On the premise of the target range, its installation height: indoor camera 2.5 ~ 4m, outdoor camera 3.5 ~10m; The elevator car is installed at its top, diagonally opposite to the elevator manipulator, and the optical axis of the camera forms an appropriate 45-degree angle with the two walls and ceiling of the elevator.

2. After the cables are laid in place, turn on all monitoring cameras to see if there are any images. If there are any problems, install a fixed surveillance camera.

3. If there is strong electricity in the environment, pay attention to the insulation of the camera installation from the ground to avoid interference.

4. If the surveillance camera is not integrated with infrared, try not to open the lens when moving and installing the surveillance camera.

5. If necessary, lightning protection measures should be taken during outdoor installation and monitoring.

6. When installing the camera, it must be placed on a relatively solid wall or place. Only after installation can the monitoring screen be prevented from shaking.

7. Debugging the infrared light should be done at night. Adjust the lighting position of infrared lamp through the display at night.

8. The cable from the surveillance camera should have a margin of about 1m, so as not to affect the rotation of the surveillance camera.

9. Infrared integrated camera, try to avoid direct light source, because the power control of infrared lamp is to control whether the working power of infrared lamp is turned on according to the photosensitive resistor installed on the infrared lamp board.

10. All-black objects, open places, water and other objects that absorb infrared rays should be avoided as far as possible in the field of vision of the infrared camera. The infrared lamp matched with CCD camera reflects to the object to form an image. If infrared light is absorbed or weakened, the effective lighting effect of infrared lamp will be weakened.

1 1. To ensure the working index of infrared lamp, for example, the power of power supply in infrared lamp must be higher than that of infrared lamp itself. In order to ensure the normal operation of infrared lamp at night, the general power supply should reach 2A.

12. During installation, be careful not to touch the lens and CCD target surface with your hands to avoid contaminating the lens.

13. It is very important to choose a good BNC header. The trouble of maintenance is avoided.

Install the line part of the surveillance camera 1. Video line: The video line of SYV75-3 is generally transmitted within 200m, 75-5 within 400m and 75-7 within 800m; In addition, we should pay attention to the quality of CCTV coaxial cable. RG59U, RG6 and RG 1 1 all require 100% copper core and 95% copper braided shield. The maximum resistance of line loop connection shall not exceed 15 ohm. When the interval exceeds 500 meters, optical cable transmission should be considered.

2. Power cord: flame retardant cables should be selected, and thick cables should be used as much as possible to reduce power attenuation.

3. Control line: generally, cable with shielding of 2* 1.0, RVVP2* 1.0, is selected.

4. threading pipe: generally, PVC pipes or PVC trunking can be used, and galvanized steel pipes (jdg pipes) should be used for buried or explosion-proof projects.

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