Analysis of surveillance cameras in use process problem

Intelligent surveillance camera video analysis techniques used in the field of monitoring has been more than 10 years, but because of the difference of industry demand, is still in the development of. But we know that monitor kept always in the operation process of the emergence of various problems, a fault can lead to nature and other various reasons, here together to learn about some of the problems of surveillance cameras in use process will appear.

Analysis of various problems in the use of surveillance cameras appeared in the process of

1, infrared hemisphere, one night illumination difference, white or bright white halo phenomenon during the day, there will be white

The phenomenon is the machine assembly or the transport process caused by vibration, image white or bright white halo phenomenon is mainly caused by infrared emitting tube of light from the lens caused by refraction to cover the ball, solve this problem is to avoid light refraction to the lens surface, isolation often use sponge ring lens and the infrared light, in the assembly must be the ball cover close to the sponge ring!

2, infrared image of normal models during the day, night image white

Usually due to machine environment reflection or on a very small scale space will appear this kind of phenomenon, caused by the infrared light reflection, to solve this phenomenon should first determine whether there is a reflection of the environment, as far as possible to improve the installation or installation angle.

Then check the effective infrared distance and the actual use of the machine is adapted to the distance; if a long distance infrared machine in a very small space because of too strong causing the machine with infrared image. This mostly occurs with other companies in the previous IR induced, because now the market LED indicators virtual standard component is too large, resulting in engineering contractor for this dislocation phenomenon has to adapt, remainder in consideration of infrared distance often made 50% or more times, in actual use will be installed when the light the camera is too strong, "not open eyes" feeling! The solution is irradiated with infrared light source distance matching!

3, monitoring without camera image

First check the external power supply polarity is correct, whether meet the requirements (power output voltage error: DC12V ± 10%, AC24V ± 5%), then check whether the video line contact is good; if the use of manual iris lens to check the aperture is open, auto iris lens is required to regulate LEVEL potentiometer enable aperture in the proper position.

4, monitoring camera color distortion, partial color

May be the white balance switch (AWB) is set properly, may also be the environmental illumination change is too large, you should check the switch is in the OFF position, should think of ways to improve the environmental illumination conditions.

5, monitoring camera image appears distorted or geometric distortion

This phenomenon may be a problem with the circuit or the optical lens of camera, monitor the geometric correction, also has the possibility is the output impedance and video cable or equipment characteristic impedance and the camera does not match. When the above phenomenon, please check whether the input impedance of the optical lens switching anomalies and monitor is set at 75 Ω (Ohm) end, then check whether the video cable impedance is 75 ohms