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Analysis of common problems and solutions of surveillance cameras

Oct 08, 2017

solar 4g surveillance

Camera no image how to do?


A: First confirm the camera power is added, usually through the light to determine. Second is the monitor is normal. Such as whether to switch to the corresponding input channel. Third, whether the normal coaxial cable compliance contact. Four is the lens aperture is open. If for other reasons, need to return to factory maintenance.


How can the camera image go white?


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.


What happens to the camera image?


A: generally through the white balance settings to improve the color cast: white balance settings in two ways:


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 A grade. In addition to the other, some cameras have white balance fixed at 3200K (incandescent level) and 5500K (daylight level) and other grade orders.


How does the camera lens choose?


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.


How is the focal length of the lens 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 size of the field of view and the distance from the lens to the object being taken are calculated as follows: 1, f = wL / W, f = hL / H


F: lens focal length


W: the width of the image (the width of the subject on the ccd target surface)


W: the width of the subject


L: distance from the subject to the lens


H: image height (subject in cc


D: the imaging surface height) field of view (intake scene) height


H: height of the subject


What is the common video transmission method? 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).


How does high 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.


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.


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.


Infrared dome camera series machine at night the image illumination is poor, white or bright white aperture phenomenon


This phenomenon is caused by improper assembly of the machine, the assembly of the photosensitive device (photoresistor) from the infrared dome camera distance will cause the infrared light is not completely cause the machine at night illumination difference; appear white or bright white aperture phenomenon is mainly due to infrared light Tube to send the infrared light through the dome to the lens caused by the solution to this phenomenon is to avoid the infrared light refraction to the lens surface, usually using the sponge ring lens and infrared light isolation, the assembly must be close to the ball sponge ring.


The infrared dome camera image is distorted or geometrically distorted


This phenomenon may be an infrared dome camera, the geometric correction circuit of the monitor has a problem or an optical lens problem, and it is also possible that the characteristic impedance of the video connection cable or device does not match the output impedance of the infrared dome camera.


When the above phenomenon occurs, please check whether the optical lens used is abnormal and the monitor input impedance switch is set at 75Ω side, and then check the video connection cable impedance is 75Ω.


The screen appears a few black vertical bar or bar mixed


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.


Infrared dome camera using auto iris lens image too dark


First check whether the EE / AI function switch is set on the AI side, and then check whether the LEVEL potentiometer adjustment is appropriate.


Infrared dome camera image quality is not good


A. Check the lens for fingerprints or dirty.


B. Check whether the aperture is tuned.


C. Check the video cable for poor contact.


D. Check the electronic shutter or white balance settings for problems.


E. Check whether the transmission distance is too far.


F. Check that the voltage is normal.


G. Check for interference sources nearby.


H. Check to install in the elevator with the elevator to ensure insulation from interference.


I. Check whether the CS interface is connected


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