Selection and installation of explosion-proof camera

Date：2012-12-24

In the monitoring project, monitoring of explosion-proof camera installation is critical, to be considerate in the selection and installation, otherwise it will cause monitoring picture is not complete or not clear. For construction monitoring of the explosion-proof camera selection and installation has carried on the thorough analysis and discussion, provides some reference opinions for the reader, the hope can give you some help.

CCD monitoring explosion-proof camera imaging is based on monitoring explosion-proof camera photoelectric conversion system as the core, when the monitoring explosion-proof camera optical image of the object being taken into corresponding electrical signals, then form the signal source is recorded. So when installing a monitoring explosion-proof camera, the light element is that we must always think about it. With the modelling of building entrances increasingly diverse,         entrances and exits of the light source changes more and more complex, so choose to have dealing with complex light environment function monitoring explosion-proof camera, and take reasonable installation, is the necessary premise of building entrances and exits clear images obtained.

The choice of the ways of building entrances monitored explosion-proof camera installation and lens adjustment:

Indoor installation: Most of the traditional way is to install the construction monitoring of the explosion-proof camera indoors. The advantage of this approach is optional monitor direction installation (in the same building construction should consider monitoring the consistency of direction and closeness, to ensure that any one people entering the building in a gateway left facial positive images). At the same time this way is easy to installation, wiring is simple, easy to maintain. It is important to note the monitoring on the selection and installation location of explosion-proof camera to consider the effect of outdoor lighting explosion-proof camera for the monitoring. If the monitor explosion-proof camera view toward outdoor installation, to choose with automatic aperture, backlight compensation stronger monitoring explosion-proof camera. For complex light environment of inward and outward chooses wide dynamic camera, strong inhibition to monitor explosion-proof camera, even adding additional light source.

Outdoor installation: Installed in outdoor stud or attachment carrier monitoring explosion-proof camera, adopt positive camera or side camera photographs of inward and outward. This way has been gradually accepted and adopted, imaging and achieved good results. The advantages of this approach is that the environment face facial outdoor natural light during the day, fully real facial image, distinct, he could take more human traits details. Night out at the entrance to a single environment lighting, in the case of ambient lighting fully also can get satisfaction, like at night. This kind of installation method, according to the environment of night illumination condition can choose low illumination monitoring explosion-proof camera or normal illumination monitoring explosion-proof camera. This kind of installation method on the downside, installation location restricted by landscape, wiring is a little trouble, some projects involve cutting of pavement, outdoor landscape environment should be considered. Some building entrances restricted by environment can't choose this way.

Under the condition of the building environment allows, suggest preferred outdoor installations, completes the inward and outward outdoor lighting at night at the same time.

Monitor the explosion-proof camera installation Angle:

According to the different of the installation position can be divided into: flat Angle, leaning Angle and back Angle.

Install the flat Angle: Monitor facial height explosion-proof camera installation height is close to ordinary people, fully showing details of facial features, is the first choice for building entrances monitored explosion-proof camera installation Angle, indoor installation, installation distance, position, height adjustable to achieve flat Angle. With three axis, biaxial adjustable monitor explosion-proof camera hemisphere, most monitoring explosion-proof camera can use wall installation at close to flat installation Angle. The downside is concealment is not strong, easy to destroy the scene environment landscape, susceptible to the influence of the light environment.

Leaning Angle installation: This way of installing monitoring explosion-proof camera often using suction or hoisting way. Its advantage is easy installation, concealment, can avoid part directly reflect the influence of light. Monitoring should be paid attention to in this way the explosion-proof camera Angle with facial shoulds not be too large, otherwise the head picture is larger, less facial features. The disadvantage is that reduce the recognition rate.

Yang Angle installation: More special, more appear in some sunken square entrance and basement entrances and exits, parking lot entrances, etc. This is due to the need of field and choose a particular way. This way the influence of various light sources must be considered. To avoid the light interference. To monitor the explosion-proof camera protection should also consider in detail. Monitoring explosion-proof camera to choose appropriate USES light processing is relatively mature products.  

In practice, the best way to install flat Angle,  it can show more facial details. It is recommended that the biggest overlooking the Angle is less than 15 degrees. When the scene environment restricted, to get the best effect can choose to install appropriate distance to adjust the Angle of object distance to realize the ideal Angle.

Monitor the explosion-proof camera installation direction:

Should first unified the building external gateway monitor the installation direction of explosion-proof camera, select external or internal, to ensure that there is always a monitor explosion-proof camera can record the positive image of characters. From the perspective of the recognition rate of portrait, positive photograph the highest recognition rate. So should try to select installation location monitoring explosion-proof camera catches people's positive image. Through practice found that the level of monitoring with explosion-proof camera face is not more than 35 degree Angle range can ensure the facial features.  

Choice of light:

Indoor installation from the light source is suitable, backlight, side light, etc. Several installation location.  

Suitable light: refers to the direction of the light and monitor explosion-proof camera's field of view in the same direction, the staff uniform positive by light, no shadow, color reproduction is normal. But if the light is too strong, can severely damage the surface of the body level. Backlighting, in contrast to the suitable light, the light of the projection direction and monitoring explosion-proof camera in the opposite direction, its main modelling characteristic is the principal subject character positive being less than light illumination, the main positive difference is bigger, the intensity of illumination and background and vision of the illuminance body positive details totally loss, black face, can't be as feature recognition.

Side light is common, most indoor installation side light environment. Lateral direction of light is light in the main body on one side of the characters, which make the main body character half bright light, half cast shadows, characters shadow level will lose, character surface comparative and intense light and shade, color reduction well.

Indoor installation should try to avoid selecting cause backlight appears the installation location, such as explosion-proof cameras can choose wide dynamic monitoring is unable to avoid the light source. Pay attention to the strong light when the portrait subject positive intensity of illumination and background illumination contrast is far greater than any existing wide dynamic monitoring dynamic than explosion-proof cameras. Most wide dynamic monitoring the realization of the explosion-proof camera technology enhances the facial details, but can't compare with suitable imaging light environment level and details. So it is very important to the choice of the three.

For the dangerous sites entrances monitored explosion-proof camera choice:

Choose the installation location of appropriate imaging, is building entrances to monitor the system to provide the high quality the premise of effective image identifiable. But the structure of the hardware conditions tend to limit our choice of installation position, the diversification of building materials, in particular, result in an increase in the difficulty of installation location choice. Building materials produced by the light of inward and outward direct reflection, refraction, diffuse cause certain interference imaging. So it is necessary to choose high quality monitoring explosion-proof camera. In the case of cost conditions permit, should choose high resolution, wide dynamic monitoring explosion-proof camera, low intensity of illumination.