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Camera Infrared Security

Integration Of Infrared Cameras And Network Technology

In 2015, the number of HD megapixels network cameras will exceed simulated camera, became the ruler of security monitoring field.The megapixel network camera and infrared array representing approximately 80% of the HD camcorder market . Infrared technology is currently more mature , high-definition , network convergence applications, network array infrared camera has also been welcomed by consumers and trust. Domestic production of various types of infrared camera based security company while improving infrared technology have also been added to the development of other types of cameras in the past, the future of high-definition network IR camera market will be more open space . For example, in all-weather surveillance of large plant , the entire infrared surveillance system using standard TCP / IP protocol, it can operate directly within the enterprise LAN. Simply install video surveillance monitoring center system server , and with the appropriate database to complete the scene image receiving a control signal coordination , real-time image monitoring, user access management , video storage, retrieval , playback , backup, recovery, etc. allowing companies to the monitoring center can not only monitor the headquarters , but also on the branch , factory remote centralized monitoring , branch , just using ADSL, optical fiber, or set up a wireless telecommunications network dedicated way between the factory and the head office , so the way to make companies do not need to deploy more staff for each monitoring point for 24 -hour observation , with only a small number of staff in the monitoring center can be. However, while high-definition visual experience brings analog products can not be compared , but we must also be aware of the sensitivity of the issue of its core SENSOR : In the same area with the same pixel , CMOS light-sensitive area is relatively lower than the CCD , resulting in CMOS CCD illumination effect is relatively poor ; another magnification of each CMOS amplifiers are different , resulting in excessive image noise at night , affecting image quality at night , so using the same pixel CCD sensor infrared camera as compared with CMOS the cameras capture the image clarity , illumination will be better. But the reality is that most HD CMOS sensor network cameras are used so as to generate a conflict between the application and the desired effect. Therefore, in order to achieve a comprehensive definition infrared surveillance , how to solve the big noise at night video , video and other issues arise snow is the key . In fact , in the current development of surveillance technology , CMOS sensor technology is developing rapidly , it also further reduces the noise signal , Star -level CMOS sensors also have been published in the infrared cameras that require low power consumption, high integration , small size , networking and under the definition of the call , CMOS sensor is undoubtedly the focus of its future to select objects . CMOS equipped with both increasing performance DSP chip , so that the video signal processing techniques can reduce the relatively high gain of the amplitude of the still picture so that it can greatly reduce and eliminate noise in the signal , thereby improving cleanliness and reducing the screen picture noise. In the infrared night vision surveillance technology and care must be taken with the same issues : first aperture size and the amount of light , the camera sensitive components of the camera aperture size has become smaller , the camera aperture size currently on the market in general from 1/1.8 "to 1 / 4" , and in the light-sensitive components and lens with the amount of light depends on the size of the camera aperture , small diameter flux accept less , and vice versa. In addition , the need to pay special attention and with the principles of the lens, the focal length of the value that is inversely proportional to the aperture diameter corresponding relationship , such as 4mm aperture ratio may f1.2-1.4, but even 200mm 50mm maximum aperture diameter may only f1.8-2.2, therefore also affect the amount of light , corresponding to the mix will affect the picture due to the distance of the imaging infrared brightness projection . Second, you must use low-light conditions the camera , the camera's minimum illumination is the minimum value of the brightness of the scene camera , camera manufacturers will give a minimum illumination of different aperture f , which is this camera's minimum illumination ( also called sensitivity ) . If you select infrared camera Minimum illumination is higher than the highest projection lamp illumination requirements , the effective distance of infrared light illumination will be most affected, as shorter projection distance or inadequate imaging range , leading to the center of the screen while the surrounding dark highlights poor display . So the camera is not really low-light surveillance cameras for low-light environment is a very important indicator . The third point is to try to use a black and white camera or day and night color / monochrome camera , in addition to the camera itself has a low light performance, due to sensitive components CCD sensor with a wide spectral range , can sense infrared spectra in the visible region and a certain range , it can be completely at night under no circumstances lighting , auxiliary infrared light so that presents a clear black and white picture . The day and night color / monochrome camera is able to transmit color signals separated from the output signal of the CCD sensor assembly green , blue and red tricolor video signal, and then synthesized to produce color television signal ( color signal sensing only the visible spectrum ) . With advances in imaging technology , has been switched digital circuits can be used to achieve the advantages of infrared sensors degrees day and night color / monochrome camera. Using masking technology allows infrared illumination range covers only need to protect buildings or facilities , to avoid disturbing light from escaping or causing light pollution . In addition , the choice of a photosensitive type, thermal or photoelectric sensor lighting , just below the threshold , or someone close to the illumination over the illegal invasion may occur when the lights begin to start alert. Increasingly compact CCD camera , compact camera also will be changing , has been able to remember multiple sets of telescoping distance and focal length of the combination mode. The lightweight camera and lens technology , making the electric load PTZ cameras smarter , and the default position (PTZ, presetIRCamera), which is equipped with infrared cameras or infrared lights, and default to all kinds of triggering device , almost done the infrared night vision cameras "real time" point trigger points , retrieve the target image . Cameras usually have automatic electronic shutter , AES and AGC , AGC and other functions can be set with a night vision camera when the auxiliary condition wherein the lens with night vision requirements must have auto iris function to do day and night illumination changes automatic illumination adjustment under the camera. Power supply monitoring system designed to unify the front-end equipment , including Infrared Illuminator section must take into account the effects of infrared light and infrared LED operating current of the power supply voltage , in addition to the length of the transmission cable will have an impact on the DC voltage decay. There are a number of infrared light in the distance difference from the control room is large, centralized power supply may result in the use of DC12V near- infrared light from the control room supply voltage is high, and far- infrared light from the control room supply voltage is low. Coupled with the bias supply voltage adjustment on the impedance of the voltage or current may cause problems , so that the infrared lamp life is shortened even burned. The voltage is too low infrared lamps which emit less power , making the projection range , distance and brightness are inadequate, reducing the imaging results. AC24V therefore recommended to use AC power, or DC power , which can ensure the stable DC output AC100V-240V power supply when the voltage fluctuations , ensuring the stable operation of the infrared lamps.

Original article published on amazines.com

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