With the development of science and technology and the advancement of society, electronic camera technology has been widely used in many fields such as commercial, civil, security and so on. It can be said that our every move, there are camera lens monitoring. So for the surveillance camera, what should we do if there is a problem? Please read this article!
1. What should I do if the surveillance camera has no image?
A: First confirm whether the camera power is added, usually by the indicator light. The second is whether the monitor is normal. For example, whether to switch to the corresponding input channel. The third is whether the coaxial cable is in normal compliance. The fourth is whether the lens aperture is open. If it is for other reasons, it needs to be returned to the factory for repair.
2. What should I do if the camera image is whitish?
A: First check if the alignment is strong. If it is a manual aperture lens, see if the aperture is too large. If it is an auto iris lens, check if the correction value is too low and make the aperture open too large. Next, check if the camera's exposure setting is correct and the speed of the electronic shutter is too slow. If it is for other reasons, it needs to be returned to the factory for repair.
3. What about the camera image color cast?
A: Generally, the white balance setting is used to improve the color cast: There are two ways to set the white balance:
A, automatic white balance, continuous mode - the white balance setting will be continuously adjusted as the color temperature of the scene changes, the range is 2800~6000K. This method is most suitable for the occasion that the color temperature of the scene changes continuously during shooting, so that the color performance is natural, but the continuous white balance does not produce the best color effect when there is little or no white in the scene. Button mode - first point the camera at a white target such as a white wall or white paper, then turn the automatic mode switch from manual to the set position, leave it at this position for a few seconds or until the image appears white, in white balance After being executed, the automatic mode switch is turned back to the manual position to lock the setting of the white balance. At this time, the white balance setting will remain in the memory of the camera until the execution is changed again, and the range is 2300~10000K. During this time, this setting will not be lost even if the camera is powered off. Setting the white balance in the button mode is the most accurate and reliable, and is suitable for most applications.
B. Manual white balance. Turning on the manual white balance will turn off the automatic white balance. At this time, the red or blue condition of the image is changed to have up to 107 levels for adjustment, such as increasing or decreasing the red level, increasing or decreasing the blue color. One level. In addition to the second, some cameras also have white balance fixed at 3200K (incandescent level) and 5500K (daylight level) and other grade commands.
4. How to choose the camera lens?
Answer: (1) The imaging size of the lens should be consistent with the size of the CCD target surface of the camera, as described above, 1/2 inch, 1/3 inch, 1/4 inch and so on.
(2) Lens focal length and field of view angle? First, according to the distance from the camera to the monitored target, select the focal length of the lens. After the lens focal length f is determined, the field of view is determined by the camera target.
(3) The aperture of the aperture or the amount of light passing through the lens is measured by the ratio of the focal length of the lens to the aperture of the aperture. The index is F, and each lens is marked with its maximum F value. The amount of light passing through is inversely proportional to the square of the F value. The smaller the F value, the larger the aperture. Therefore, whether to use manual aperture or automatic aperture lens should be selected according to the degree of light change in the monitored part.
5. How is the focal length of the lens calculated?
Answer: Formula calculation: calculation of field of view and focal length. Field of view refers to the size of the object being ingested. The size of the field of view is determined by the distance from the lens to the object being ingested, the focal length of the lens and the required imaging size. The focal length of the lens, the size of the field of view and the distance from the lens to the object being ingested are calculated as follows: f=wL/W, f=hL/H
f: lens focal length
w: the width of the image (the image is imaged on the ccd target surface)
W: the width of the subject
L: the distance from the subject to the lens
h: image height (image height of the object on the ccd target surface) field of view (intake scene) height
H: the height of the subject
6. What are the common video surveillance transmission methods? What is the transmission distance?
Answer: 1. Coaxial cable (transmission distance 0-600m), 2. Optical fiber (0-20Km or more), 3. Wireless (3G network, or 2G network), 4. Traditional network cable (100m without relay), 5. Twisted pair (0-2400m, divided into active and passive).
7. What should I do if the camera's monitoring effect is blurred from the middle to both sides?
A: The angle of the infrared light does not match the competition of the lens. Infrared light angle and lens focal length match the consistency. The camera's monitoring effect is blurred from the middle to the two sides, which is the flashlight effect commonly mentioned in the industry. Only the appropriate angle of the infrared light board with the appropriate angle lens can make the camera play its best performance.
8. What should I do if the high speed ball is not controlled?
Answer: 1. Check if the high speed ball address code is the same as the address code of the keyboard when controlling. 2. The communication baud rate is the same as the controlled keyboard. 3. Is the communication protocol the same as the controlled keyboard? 4. Wiring is in compliance with the RS485 standard.
9. What is the reason why the network camera cannot display images?
A: First check if the power indicator is on, indicating whether the camera is powered. 2. If there is a network indicator, see if the indicator is lit or flashing. Indicates the networked status of the camera. 3. Check if the client computer network is connected, whether it is on the same subnet as the network camera, and whether it is on the same LAN as the camera. Provide a basis for the computer to normally connect through the network. 4. Check if the IE control is installed correctly. And allow the control to run. 5. Whether the aperture of the camera is turned on. It indicates that the camera image CCD can normally collect the light that is incident on the lens from outside. 6. Whether the camera color and brightness settings are reasonable.
10. What is the problem with camera image blur?
A: If the focus of the camera lens is not accurate, you can adjust the back focus of the camera to make the camera image clear.
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