Precautions for IP network camera installation
If you want to install an IP network camera under the existing network architecture, a computer with strong performance is indispensable. You can choose Windows95 / 98 / NT / 2000 or Linux operating system PC. In addition, Apple Computer is also a Good choice. And the computers on the market generally have network support functions and browsers, so users can easily start the IP network camera without having to worry about other peripheral devices.
Set a password to increase the security of network transmission
If you want to use IP network camera, it is recommended to set a password to protect the data recorded by the camera; the password can not only prevent the data, but also ensure that the camera operation settings will not be tampered with at will. To be applied in places with higher security requirements, IP network cameras can be connected to computers with special protection measures, and encryption technologies such as HTTPS protocol can be used to ensure the confidentiality of data.
** Quality Image Notice
If you want to capture the highest quality image, users should pay attention to the display settings of the computer screen, the screen color must be at least 65.000 bits; in addition, although the flat LED display is very convenient to use, when viewing the image, the effect It is not as good as the CRT screen. The requirements for other quality images are as follows:
. Use lots of light
In many cases, the poor image quality is due to low illumination. Generally speaking, the stronger the light, the higher the quality of the image; and in the weaker light, the color of the image is easy to be monotonous and blurry. Generally professional photographers will use the camera flash to make up for the lack of light.
In addition, although the camera with higher resolution can work under the condition of less than 1 Lux, it only means that the camera can capture the image at 1 Lux, but it does not mean that it can get good image effect at 1 Lux; if To capture high-resolution images, the illuminance must be at least 200 Lux.
. Avoid Backlighting
Generally speaking, the dynamic adjustment capability of the camera is limited, and bright areas on the image should be avoided as much as possible, because a bright image will cause too much exposure and the object will appear too dark.
. Reduce Contrast
The user can adjust the camera's exposure to obtain a more average illuminance.
Install an outdoor camera
If you want to install the IP network camera outdoors, you need to configure the outdoor casing. Outdoor cameras generally use automatic zoom lenses, which can adjust the light required by the image sensor, improve the dynamic function of the camera, and protect the image sensor from damage by strong light.
The precautions for other outdoor IP network cameras are as follows:
. Illumination When using the camera at night, in order to avoid reflections and shadows, lighting equipment is usually required. Infrared lighting can be used instead of ordinary bulbs. However, users must use black-and-white cameras and network image servers with infrared lighting equipment, because black-and-white cameras are more sensitive to infrared light, while color cameras cannot perform infrared functions.
. Avoid direct sunlight. Try to avoid direct sunlight in the image. Direct light will prevent the camera from capturing the image and may permanently discolor the color filter on the sensor chip, resulting in streaks in the image. If possible, keep the camera in the same direction as the sun when installing, and try to avoid shooting at the sky.
. Amplifier gain can adjust the gain level of the image sensor in the computer. The higher the gain, the better the performance under low light, but the interference will also increase. When the light is weak, the user can use high gain to get better performance, and when the light quality is good, the user can also get the best quality image by using low gain.
. Shutter speed Normally the shutter speed should be set to 1/50 or 1/60 seconds; when the light is weak, the exposure time is long, and good performance can be obtained. If you want to capture fast moving images, the shutter speed should be set to 1/10000 second.
Choose the right lens
. The base of the base camera has two main standards:
1. The distance between the CS-mount sensor and the lens should be 12.5mm.
2. The distance between the C-mount sensor and the lens should be 17.5mm. If you cannot focus, you may have selected the wrong type of dock.
In addition, users can also use a 5mm collar (C / CS adapter ring) to convert C-mount lenses to CS-mount lenses.
. Sensor size The larger the sensor size, the more expensive the lens; 1/2 "lens is suitable for 1/2", 1/3 "and 1/4" sensors, but not for 2/3 "sensors If you use a lens made with a smaller sensor on a larger sensor, the image will have black corners.
. Focal length The focal length is combined with the sensor to form a viewing angle; the small focal length has a wider viewing angle, the larger focal length has a narrow telephoto viewing angle, and the operation must be more precise when adjusting the focus of the telephoto lens.
. Lens types There are three main types of lenses:
1. Single focal length: The focal length is fixed, such as 4mm, 8mm.
2. Zoom lens: The focal length can be adjusted within a certain range, such as 4-10mm; the focus does not change when the focal length changes.
3. Variable focus lens: This is a low-cost zoom lens; when the focal length changes, the lens must be refocused; usually 3.5-8mm.
. Aperture Aperture is a mechanical device used to adjust the amount of light passing through the lens. There are three different types of variable aperture in the lens:
1. Manual iris: Turn a ring to adjust the iris.
2. DC automatic iris: the output of the camera adjusts the iris.
3. Image automatic iris: analog image signal adjustment iris; this type is not commonly used at present.
Outdoors usually use automatic variable aperture lens, which can protect the image sensor from the damage of strong light.
Network transmission line
.PSTN phone mode is widely used to connect to the external network, it is cheap and practical, but the transmission speed is not very fast, sometimes it will cause a transmission error condition and need to resend the data. When downloading files, the maximum speed can reach 56kbit / s, but when uploading files, the maximum speed is 33.6 kbit / s.
The usage rate of the ISDN telephone mode is very high in many countries, and the maximum transmission speed is 128 kbit / s.
.xDSL mode
Xdsl mode includes: ADSL, HDSL, IDSL and VDSL, etc., which are becoming more and more popular. Both telecommunications service companies and ISP manufacturers provide xDSL transmission mode, as long as they pay a fixed monthly fee, they can connect to the Internet.
The standard speeds of different ISP manufacturers are also different, and the upload and download speeds are also different. Usually the download speed is about 1Mbit / s and the upload speed is about 250Kbit / s.
.Cable Modem
Using cable TV cable transmission, this service is more popular in densely populated metropolitan areas. The speed varies from region to region, and the speed will vary depending on how many users are using the service. The general maximum speed is 1Mbit / s.
The .T 1 connection is provided by the Internet ISP manufacturer and can be connected to the Internet as needed by paying a fixed monthly fee. This line is more popular in units with higher line usage rates such as company line numbers or Internet cafes. The connection speed is 1.5 Mbit / s.
There are two main standards for .10 Mbit Ethernet; 10BaseT using twisted pair and 10Base2 using coaxial cable (RG-58). Because 10Base2 is a little unreliable, if there is any interruption on the cable, the entire network will stop working, so it is not often used. The general transmission capacity can use 50% of 10 Mbit / s.
The main standard of .100 Mbit Ethernet is 100BaseT, which can use about 50% of 100Mbit / s capacity; if there is a switch, you can use 100% capacity.
.1000 Mbit (GB) Ethernet is used in the backbone network of the building, the main standard is 1000BaseT, about 50% of the 1000Mbit / s capacity can be used; if there is a switch, 100% of the capacity can be used.
.Mobile phone (GSM, CDMA, CDPD, TDMA)
The mobile phone mode is a good application method for connecting remote cameras (such as cameras used for traffic monitoring) without the need for a telephone line. Its transmission speed is low, but it can meet the needs of still images. The general communication speed range is 5-20Kbit / s.
.Wireless network (IEEE 802.11)
Since no cables are required, wireless networks are becoming more and more popular. There are many standards for high-speed wireless communication, usually the maximum communication speed range is -11Mbit / s; the general actual speed is 1Mbit / s.
.Wireless network (Bluetooth)
Bluetooth wireless communication is an increasingly popular standard, with a maximum speed of 720 Kbit / s and a general actual speed of 500 Kbit / s.
Recommendations for selecting a connection line • The telephone mode is suitable for applications that do not require high-speed transmission. • xDSL is suitable for offices or stores. • Mobile phones or wireless networks are suitable for remote cameras. • 100Mbit Ethernet is recommended in buildings.
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