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  • IP surveillance picture without limits

        When the network monitoring market matures , more and more users will shift focus to the IP field . Not only by media propaganda , more important is the IP product prices lower , down to the consumers affordable range, two same function security surveillance camera, the same price why not buy a clear image of it ?
        Simulation and Network Monitoring dispute is a protracted war , and in this " battle" in , IP camera and more obvious advantages . IP camera are integrated more features, more scalable ; analog monitor lost its price advantage, despite the relatively network transmission , the coaxial cable is more stable, but in the new Internet age , users are looking for is more " portable sex " , a set can be viewed at any time , remote -controlled monitoring equipment.
        Analog surveillance market is also not limited to the lonely , the " Achilles´ heel " of the image quality to be the case . Traditional analog surveillance image resolution up to D1, relying on cable television technology, video transmission signal bandwidth 6M; IP surveillance start on locating high areas , although megapixels is not a recognized standard , represent sensitive chip to achieve an indicator, ISP image processing chip , factors such as multi- scan format , but use the industry point of view , we have put megapixels defined as a high minimum standards .
        By Network HD monitor pressure , analog monitor image resolution has also been improved. Soared from the original D1 to 960H, is currently the analog monitor image resolution limit. It is understood that , out of shape analog monitor analog lines from 27M up to 36M, data transmission is also greatly increased , in theory , the higher video resolution transmission bandwidth needs will be greater .
        960H current resolution limit of the analog data is already 6M bandwidth even further advanced in front of the camera chip used , also because the analog bandwidth of the bottleneck limits . Although there have been extended bandwidth transmission technology , but the market reaction mediocre results .
        Analog monitoring and network monitoring image contrast
        Network HD and analog HD image resolution much worse , the data on the ratio of the test are also some " bias " is not inaccurate , but video surveillance camera is to capture the actual object , the color of the object, how to better interpret the effect of moving I am afraid that will test the ability of the entire monitoring system .
        Not difficult to see from the comparison chart between digital imaging and analog imaging clarity particularly visible difference though can not see , but the analog image from a visual point of view gives a total lack of layering ; Besides color reproduction is not as digital effects images so real, bright enough green , and white are too "absolute ."
        HD image resolution by scanning different
        An image is 960H , another is 720P image ; an analog -based control framework , and the other is based on the digital network mode. From the visual images which can distinguish more clearly drawn , but you know , resulting from differences in image clarity where .
        960H high- wire analog cameras often use interlaced scanning, while the same light-sensitive chip uses interlaced scanning image clarity is lower than the progressive scan mode . The 720P HD image is progressive scanning , image output is more delicate. Some vendors like to play word games with the user , called 960H to high surveillance camera, in fact, objectively speaking , 960H and 720P image resolution has reached 700 lines , but the former is still only an analog surveillance camera has been identified as a high number of lines , of course, If the image is smaller than the frame rate 720P 15pfs, strictly speaking, can not be called network HD .
        Impact of the resolution on the monitoring function
        Despite the current simulation and network alarm monitoring systems support functions, such as basic motion detection , motion alarm, tampering , etc. These functions do not involve the police image , the sensor can trigger an alarm , the alarm function to achieve high-precision , I am afraid that is inseparable from the image resolution.
        The most popular applications , the high-definition monitor with face recognition, fear not do analog control system . Monitoring system implanted identification analysis is not the problem , the core question is would like to "Database " provides a sufficiently high -definition video images. Not only to capture the facial information, the image is more important to be clear contrast to the full facial features to ensure the accuracy of the data. Security Exhibition in Beijing , I also noticed that such a high-definition monitor -based face recognition device that can not only capture the human face , but also can determine the age , how to capture the image pixels is not high enough , is it not the age of the respondents will be invisible to increase ...
        Monitoring technology or application will choose the appropriate image resolution , when the surveillance camera integrated functionality needed for a growing number of its data base to be processed according to the image resolution, and therefore the future of surveillance camera or a subsidiary function to achieve the function must Architecture in HD foundation, analog monitor can withstand pressure, which requires testimony of time.
        For network HD definition, we can be broadly summarized as follows : the image resolution (TVL value ) , frame rate, video aspect ratio , image scanning, color reproduction , etc., which is a monitoring device whether Hengping HD is an important basis , but for now , network surveillance camera to meet all these requirements , 960H representative for the analog HD , there are always people willing to fail , apparently analog HD monitors also more than a little gap .