Surveillance camera FAQ
With the development of science and technology, social progress, electronic camera technology has been widely used in business, civil, security and many other areas. So for the surveillance camera, but a problem, how should we do? Xiao Bian for you to list the following common problems:
1, how to do if monitor the camera no image?
A, check whether the power supply is connected, the power supply voltage is sufficient; b, BNC connector or video cable is bad contact; c, lens aperture is open; d, video or DC drive auto iris lens control line is connected. e, is the monitor is normal. Such as whether to switch to the corresponding input channel. f, if for other reasons, need to return to factory maintenance.
2, the screen appears a few black vertical bar or bar mixed?
A, this situation is generally the machine power supply output voltage ripple is too large, should strengthen the filter and the use of good performance DC power supply.
3. How to do about white camera image?
A: first look at whether the alignment of light is more intense, if it is a manual aperture lens to see if the aperture open too large. If it is auto iris lens, check the correction value is too low, so that the aperture open too large. Second, check the camera's exposure settings are correct, the electronic shutter speed is too slow. If for other reasons, need to return to factory maintenance. Check whether the lens ring is too large and cause the image to be white; b, after checking the camera has an automatic aperture brightness auxiliary adjustment potentiometer, whether the potentiometer is too large; c, check the monitor is transferred too large or malfunction.
4. color distortion, color cast?
A, it may be that the white balance switch (AWB) is improperly set, or it may be that the ambient lighting conditions change too much. In this case, check whether the switch setting is in the OFF position and try to improve the lighting conditions of the environment.
A, automatic white balance, continuous mode - this time the white balance will be set with the scene color temperature changes and continuous adjustment, the range of 2800 ~ 6000K. This method is the most suitable for the scene where the color temperature of the scene changes continuously during the shooting, making the color appear natural, but for the scene with little or no white, the continuous white balance does not produce the best color effect. Button mode - first align the camera to white objects such as white walls, white paper, and then manually set the auto mode switch to the set position, leave it at the position for a few seconds or until the image is white, After being executed, the automatic mode switch is set to the manual position to lock the setting of the white balance, and the white balance setting will remain in the memory of the camera until the execution is changed again, in the range of 2300 to 10000K During this period, the setting will not be lost even if the camera is powered down. Setting the white balance with buttons is the most accurate and reliable, and is suitable for most applications.
B, manual white balance, open manual white balance will turn off the auto white balance, then change the image red or blue condition up to 107 levels for adjustment, such as increasing or decreasing the red one level, increasing or decreasing the blue one
5. How to choose a camera lens?
A: (1) The image size of the lens should be consistent with the size of the camera CCD target surface, as described above, 1/2 inch, 1/3 inch, 1/4 inch and other specifications.
(2) lens focal length and viewing angle, first of all according to the camera to the target to monitor the distance, select the lens focal length, lens focal length f is determined by the camera target surface to determine the field of view.
(3) aperture or light through the lens of the amount of light through the lens focal length and light aperture ratio to measure, to F for the mark, each lens are marked with the maximum F value, the amount of light and F value of the square is inversely proportional to the square , The smaller the F value, the larger the aperture. So should be monitored according to the degree of change in the degree of light to choose a manual aperture or automatic iris lens.
6. How does the focal length of the lens be calculated?
A: The formula: the field of view and the calculation of the focal length of the field of view refers to the size of the object being taken, the size of the field of view is the distance from the lens to the object, the lens head and the required size of the image determined. The focal length of the lens, the field of view, and the distance from the lens to the object being taken are calculated as follows: f = wL / W, f = hL / H
F: the focal length of the lens; w: the width of the image (the width of the subject on the ccd target surface); W: the width of the subject; L: the distance from the subject to the lens
; H: height of the image (height of the subject on the ccd target surface) field of view (intake scene) height; H: height of the subject
7. What is the common video surveillance transmission mode? Transmission distance is probably how much?
A: 1. Coaxial cable (transmission distance 0-600m), 2. Fiber (0-20Km above), 3. Wireless (3G network, or 2G network), 4. Traditional network cable (100m without relay), 5. Twisted pair (0-2400m or so, divided into active and passive two).
8, the reasons for the distortion of the image?
A, can usually adjust the monitor line can be synchronized; b, or be disturbed.
9. What is the effect of the camera's monitoring from the middle to the sides?
A: The angle of the infrared light and the lens does not match the degree caused by the match. Infrared lamp angle and lens focal length with consistency. Camera monitoring effect from the middle to both sides of the fuzzy, that is, the industry often said flashlight effect, only the appropriate angle of the infrared light board with a suitable angle of the lens in order to make the camera to play its best performance.
10. How does the speed ball control?
A: 1. Check whether the high speed ball address code is the same as the address code of the keyboard at the time of control. 2. Whether the communication baud rate is the same as the control keyboard. 3. Whether the communication protocol is the same as the control keyboard. 4. Whether the wiring meets the RS485 standard.
11. What is the reason why the network camera can not display the image?
A: First check if the power indicator is on, indicating whether the camera is powered on. 2. If there is a network indicator, see if the indicator light is on or flashing. Indicates the network status of the camera. 3. Check whether the client computer network connectivity, whether with the network camera in the same subnet, is not the same LAN with the camera. For the computer can be provided through the normal network connection basis. 4. Check that the IE control is installed correctly. And allow running controls. 5. The camera's aperture is open. Indicating that the camera image CCD can be collected normally into the outside of the lens into the light. 6. Whether the camera color and brightness settings are reasonable.
12. What is the problem with camera image blur?
A: camera lens focus is not allowed to create, you can adjust the camera's back focus, so that the camera image so clear.
13. Is the image quality of the camera bad?
c, video cable contact bad; d, electronic shutter or white balance set with or without problems; e, transmission distance is too far; f, the voltage is normal? c, the video cable is bad; ; G, near the existence of interference sources; h, installed in the elevator with the elevator to ensure that insulation from interference; i, CS interface is connected.
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