Video surveillance storage systems now there have been many high-tech security monitoring technology as a core component of the system,the first intelligent stream technology,which is based on image recognition system after moving speed of the main screen will be properly recorded video streams adjustment,the final video storage . For slow- motion monitoring body , can even stream record low 8 / second (fps) or less,the monitoring body for the normal speed of movement,the stream will be set to normal 25fps, for sensitive images of moving objects in video stream can be set at 30fps or more. For monitoring of high-speed movement of the body,in the high speed ip cameras with,stream up to 1000fps or more.Intelligent Stream technology can reduce non-sensitive video images take up storage resources , thus providing ample sensitive images recorded capabilities. The second is a dynamic area of adaptive intelligent monitoring technology to a garage video monitor screen,for example, sensitive information on the screen for the movement of vehicles and people . Screen is not sensitive to the background ( ground and roof ).However, in an actual video recording , the background ( ground and roof ) occupy more than 50% of the storage space. Image recognition technology can determine the fixed and moving objects background image , which has the only sport in technology may record the screen. Dynamic Intelligent Monitoring is the only region in addition to the background records of moving objects , thus greatly reducing the need for video storage space , the length of time the same video storage space can be reserved doubled. Camera system by image recognition technology, intelligent learning can determine which image is the background , even PTZ ip cameras by automatically learning within a set period of time , you can also record video automatically determine the new context , in order to achieve the object of the motion picture intelligent monitoring. Third low bit stream according to a non- sensitive zone technique , 25% to 30 % of the area is generally above the top of the video image of the sky or construction , the basic elements are less sensitive area may occur. Some typical surveillance images , such as images of the red mosaic part of the people concerned do not contain basic video content , so you can ignore the non- sensitive areas of the image or video stream another record low number , just in time to play with high stream video well synchronized. Worthy of note is that non- sensitive areas in different application scenarios , different, and some perhaps in the bottom of the video image , and some monitoring scenario , non-sensitive area is irregular, can be placed after a good video surveillance system , based on the actual case then manually set the application level.
The fourth is the face / vehicle identification ( or other sensitive moving objects ) drive HD video technology , in particular scenes, such as the building of the entrance , elevators and other places, people face is sensitive images. In the garage , at the entrances to the cell , the vehicle and its license plate is sensitive images. Of course , if all adopt high-definition monitors meet monitoring requirements , but the video store in particular will require a long time to save vast amounts of storage space ; If the image recognition technology , in the event of the set when it is sensitive to image-driven high-definition surveillance ip cameras start recording for general non- sensitive images, and even video streaming startup SD to record low bit rate . Such a combination of HD and SD monitoring records , which is to ensure the quality of the recording sensitivity of the image, while reducing the amount of video memory and a larger extent . The last frame of the video file is a sequence of distributed storage technology , the video frames in one second to generate a sequence of frames for the identification , storage and playback simultaneously preparing sequence , the frame is divided into several different sequences of file storage ; single frame sequence files can be play alone , the effect is equivalent to the low stream recorded video. When all frames of video playback sequence can be synthesized completely together , it is HD (or SD) video. When you need to reclaim storage space when stored according to strategic planning , the first part of the sequence of frames of video files occupied area coverage . Another part is preserved , and thus more efficient use of storage space.
Recording , storage, intelligent monitoring of the video stream , and is the result of a series of different logical levels of image recognition for intelligent judgment. Adaptive dynamic region in which intelligent monitoring technology , the use of non-sensitive record low stream technology according to actual needs , throughout the entire storage process ; , or manually set according to the application layer , selectively implemented. Image recognition from the initial recognition, the fine identification be needed at different levels . The sampling frequency of the video image recognition , according to need , to set a specific frequency , the image of each frame is not necessary to have identified. From the historical point of view , security monitoring is not considered to be able to bring a high return on investment , but one costs. Especially important evidence after the video data is verifiable , in the bank , the judiciary , safe city , video image storage time in 1-3 months or even six months. With the era of high-definition monitor , clearer images meant greater storage capacity , more equipment number , larger room area , a higher cooling costs and more expensive maintenance costs. So in addition to explore how to apply the monitor to achieve more value than we should be concerned about how to reduce the overall cost of ownership of a video surveillance system . Security monitoring new demands on storage can be simply summarized as follows:
High capacity : HD brings surge storage capacity , needs a stable and reliable high-capacity storage , improve the capacity of a single system , sas extended by cascading multiple jbod, support 3tb, 4tb hard drive, enhanced raid. The use of clustered storage systems, storage systems to enhance flexibility scalability, reliability alone make up for deficiencies ; High performance: high-definition monitor the total bandwidth requirements for high storage and storage performance tuning should be based on monitoring features. Large stream high -definition concurrent data streams in different modes ( read -write , edge deletion and writing , raid rebuild ) the io performance optimization , nas performance optimization. Improve nvr software embedded in the application processing capabilities, the rational allocation of system resources ; energy efficiency : mass storage deployment is behind a lot of energy consumption and high cost, low-power monitoring equipment should be designed . In the era dvr , monitor manufacturers through the hard holiday to reduce power consumption and extend life, and network storage can be used to achieve energy maid , but the maid more applicable to the backup archive environment . Taking into account the monitoring application is 7 * 24 uninterrupted , choose a high power conversion efficiency (80plus power supply or DC power ) more valuable , can not affect the case of low-power applications decreased ; high density: the basic monitoring requirements for storage tb is to reduce the cost and cost per each slot , after the popularity of high-definition monitor , the original 3u16 -bay equipment , limited storage capacity of a single , high -bay storage can support more ip cameras . 4u24 bit more of a high-density disk storage , each slot can effectively reduce the cost and improve the single storage capacity , saving rack space ; highly applicable : Storage must be designed for the monitoring of the actual needs and solve customer needs in order to survive . Excessive file fragmentation results in performance degradation , vulnerability of the file system after a power outage , streaming direct writing , efficient indexing structure , improve nvr embedded applications convenience and compatibility, support windows / linux software , provides external monitoring subsystem api interface to achieve high efficiency analysis , rapid positioning in the mass data. These are stored in a high-definition monitor technology development process need to focus on solving problems.
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