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  • Four strokes to keep a sharp low-light cameras

        For low-light HD IP camera is . In addition to high-resolution sensor , a good lens for aperture type , processor performance , the video signal amplification and noise reduction according to the level of illumination and reliability also determines the success or failure of low-light HD camera.
        Undoubtedly, illumination definition (HD) camcorder may unexamined spent the day , because it is no challenge , but at night he began full of energy, maintaining the same high resolution in low light at night is not a simple thing. In this section we introduce the option of sensors.
        Due to rapid migration to HD entire security industry are harder and faster development of related cameras. megapixel IP camera or HD video camera display more pixels are packed onto the same chip . Provide a clearer picture also affects the sensitivity of the light.
        The camera is located behind the eye lens on the image sensor chip resides . There are two main image sensor : CCD or CMOS. The main advantage of the CCD sensor is its sensitivity to light once , and CMOS design allows integration with other technologies more smoothly . In other words , CCD sensor has been regarded with less visual noise and distortion to produce images more beautiful photos in low light conditions . However , CMOS progressive speed megapixels CCD sensor lets eclipsed .
        CMOS Rise
        CMOS image sensor having more pixels , the sensitivity and dynamic range. They provide real results for effective video surveillance. We see more and more demand from the HD camera imaging preferences more pixels and bigger target surface . There are a large number of monitor manufacturers to adapt 1/1.8 " , 1/2.5 " , 1/2.7 " and 1/2.8" CMOS sensor cameras , and the number is still increasing.
        Multiple sensors and Lux value
        Performance of the camera is very dependent on the components. However, in the world of IP camera , sensor performance is not everything, powerful processors can handle more complex algorithms . Aperture and shutter speed type also significantly affect the performance of the sensor exposure and low light cameras.
        Aperture
        Aperture is a light through the lens and camera openings. It controls the irradiation light to the number of sensors . It´s like the human eye , when it is sunny aperture is small, at night it becomes larger. Aperture lens type should match the low-light cameras . A fixed aperture, manual, automatic iris lens, and P-Iris lens . For example , if the camera is used indoors , then manual iris work, but outdoors , the light can change a lot, or P -type auto iris lens aperture may be more appropriate. P-Iris works together with the camera to adjust the picture according to the light exists.
        How Auto Iris work
        Auto iris is a complex system that includes motors for controlling the lens aperture , micro computer software to control the camera gain. In bright sunlight , the standard auto iris will close to the minimum , but the auto iris to avoid blurring limits the minimum size of the aperture . Aperture photos in low light conditions usually open to the maximum. Because it can reduce the depth of field , automatically reducing the aperture size of the diaphragm aperture , and increases the gain of the camera . Auto aperture applies only to certain types of cameras.
        Shutter speed
        The shutter can also affect the exposure of the sensor. Determines the shutter time the sensor is exposed to light, usually expressed in seconds (1/1000, 1/100S, 1/30, 1/3, etc. ) . Many cameras use of aperture and shutter speed control to adjust the light input. An important question to the proper use of slow shutter speed in dark scenes , slow shutter speed can make the image brighter , but will produce blur and ghosting .