Hikvision camera has vertical lines may exist for the following reasons:
1, poor contact between the video plug and socket, video cable connector crimping, hinged point of contact resistance becomes large, the video cable shielding is not good.
2, the video connector leaning on the mounting bracket or riser has loose contact.
3, some places in the harsh electromagnetic environment, even without the above defects will appear image interference, such as industrial plants, elevator cars, etc., need to take appropriate measures, some of them have to change the transmission method in order to completely eliminate interference.
4, utility superimposed on the spike, mutation, clutter intrusion caused by interference.
5, fiber optic cable transmission, tail fiber is not screwed in place or butt surface contamination.
Extended information:
The rest of the problems that may arise and the possible causes:
1, raceway interference
Raceway interference is manifested in the image superimposed on the upper and lower slow-moving horizontal bars, which is obviously the AC mains or frame rate interference.
The causes of this problem are:
1) the beginning and end of the video transmission are grounded, there is an AC potential difference between the two places, as shown in Figure 1, the interference signal Vn and the input signal Vi superimposed on the transmission line to reach the load Ro, which is the most common cause.
2) DC power supply is bad, such as DC regulated power supply rectifier filter circuit internal resistance becomes large, electrolytic capacitor leakage, overload, grid voltage is too low. DC power supply bad often manifested as two horizontal bars on the screen interference (100Hz), other power supply interference only a horizontal bar (50Hz).
3) RF transmission, sometimes with high-frequency cable to the signal amplifier feed 50Hz AC power, transmission equipment, "AC choke" overload magnetic saturation caused by cross-talk.
4) RF transmission, the system overload cross-talk, other channels frame backhaul interference to form a roll-off, often accompanied by line backhaul diagonal interference.
2, mesh interference.
Shown as a moving fine mesh superimposed on the image, often accompanied by clutter interference.
The causes of this problem are mostly:
1) radio wave intrusion, to the short and medium wave broadcasting stations interfere with the most, all the causes of clutter interference can be introduced into the net interference.
2) medical equipment or high-frequency injection molding machines and other high-power high-frequency industrial equipment, poor-quality cordless telephones and walkie-talkies, remote control equipment and other high-frequency interference.
3) Intermodulation interference caused by system nonlinearity during RF transmission. Estimating the frequency of the interference source to help troubleshooting, reticle running not fast, you can count the number of horizontal direction of the screen interference line root "N"; or with a ruler, then N = (screen horizontal width / interference line distance), because the TV line positive range time of about 52uS, so the source of the interference T = 52 / N (uS), f = 1 / T (MHz).
3. The image is followed by a faded, negative, or unsynchronized other image.
The causes of this problem are mostly:
1) Video matrix switcher channel isolation degradation, plug-in poor contact.
2) When the optical, video distributor, matrix and other equipment is not connected to the public **** ground or poor grounding, different monitors are connected, different paths of the video signal will crosstalk each other, should be improved to the ground, or each road independent "floating".
3) RF transmission, adjacent channel level difference is too large, by the neighboring channel interference.
4) RF transmission, the system cross-talk interference.