KostasMellos, head of video and transmission at Interlogix, said that while megapixel cameras are growing fast, analog cameras are better at lighting processing performance.
Ray Lam marketing director David Lambert said that webcams require lighting to ensure high-performance images at night, reducing transmission bandwidth and storage requirements while ensuring faster frame rates. Proper illumination can significantly reduce noise in the picture and enhance the efficiency of video compression and transmission.
Each camera has different lighting requirements. For example, Lamber uses video surveillance with infrared light, white light with front-end detection equipment to detect potential hazards, and navigational lighting in hazardous environments.
According to Lamber, many projects use traditional street lighting for security and surveillance, allowing the camera to capture color images. However, a practical lighting solution can greatly improve the effectiveness of the video surveillance system.
Factors to consider in design
Lamber said that in video surveillance under infrared and white conditions, the camera is monitored from the vertical projection surface, and this requires more direct consideration: distance and angle, typically two illumination units per kilometer, angle from 10 degrees to 120 degrees.
Under normal lighting conditions, according to Lamber, the following points are usually considered:
1. What is the purpose/application? Usually the direction of the indication, the installation height, etc. are identified. For example, in a large park, long and narrow roads or aesthetic architectural decorations are different.
2. Are there specific lighting requirements for the customer or application criteria? Considerations include average illumination, minimum illumination, consistency (minimum VS average), diversity (minimum VS maximum), and horizontal or vertical planes.
3. Are there other scene setting specifications? Is there a scene setting plan? The installation height is critical, and information on objects such as obstacles, tree barriers or walls is also critical. Should the lighting be adapted to the existing illuminator?
select
It is critical to identify the best lighting conditions for your project requirements. Mainly weigh the distance, angle, maximum energy consumption, input power, maintenance elements, color reproduction, security, installation simplicity and technical support. Suppliers may help security experts select products that best meet distance and angle requirements.
The ALPR application also has special lighting requirements. “A license plate auto-recognition camera usually has a shutter setting, such as 1/1000 second, to avoid unclear images caused by movement,†Lambert said. “The light that reaches the image sensor is 20 times less than the traditional shutter speed, such as 1/50.†The license plate auto-recognition camera requires additional illumination to optimize nighttime and cloudy camera performance.
The pulsed illumination system allows the LED to transmit two to three times the light of normal illumination. Since the camera shutter remains no longer in an open state, the average temperature can be lowered, thereby extending the operational life of the pulsed LED.
led
Lighting technology has been developed for quite some time, and the popularity of LEDs highlights the need for energy efficiency. Compared with other lighting equipment, LEDs consume less energy, have a long life and have less heat radiation.
In terms of monitoring, the use of LEDs can reduce operating costs and simplify the maintenance process. In general, hospitals using 100 such bulbs can save $72,000 a year.
However, the service life cannot be judged only by the specification sheet. Although LEDs are generally considered to be long-life devices, they are only established when the LED devices are properly operated; the lifetime of the LEDs is directly related to the operating temperature. The term and scope of the warranty is also a sign of whether the manufacturer has confidence in the product.
Green
In a global warming environment, some shopping malls or parking lots will dim the light after a certain time in the evening.
Also consider the issue of light pollution. Excessive lighting can reduce quality of life or cause health problems.
John Huang, deputy manager of research and development at CamdeorTechnology, said there are many options for infrared lighting. Before you can compare specifications, you must first confirm which application you plan to use.
Moreover, most security and surveillance cameras now use standard lenses, which can affect the shooting.
rule
In terms of lighting design, the needs of different applications are quite different. In general, the effect of the IR lens can only be reflected by the camera and its image capture, so there is less guidance on IR lens selection.
However, the British Standards Board recently considered the gun to be unsuitable for remote monitoring. Cameras with integrated LEDs at the lens release more heat and therefore attract insects such as spiders. This will cause maintenance troubles, and will also cause false positives and waste.
Stand-alone LED lighting typically includes a thermal management system that helps the user fit the lighting standard and allows the user to get a faster police response. In addition, safety is a key element of any security device and should be checked to avoid potential threats. The naked eye is actually very sensitive; the concentrated beam can cause permanent damage to the eye. Although the LEDs have been removed by the revised standards of EN60825 and IEC60855-1:2001, some LED standards are still based on this.
According to the category of EN/IEC60825-1:2001, a type of laser/LED device is harmless to the naked eye under normal conditions. In addition to the use of focusing optics, Class 1M laser/LED devices are harmless to the naked eye. Warning: Do not directly use the naked eye to optics.
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