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Q: What is ASF (Advanced Streaming format)?

A: ASF (Advanced Streaming format) is a kind of video compression format used on network.

Q: What is WDR (wide dynamic range)?

A: WDR camera is more and more popular, it can be used in environment where with complicated light situation, It means a kind skill of ensuring camera recognize specific features of objects in strongly contrast. WDR camera is scores of times as dynamic range as traditional camera which has only 3:1 dynamic range.

Q: What is the difference between a DVR and a NVR?

A: a.The NVR connects to the computer network and so does all the IP cameras. This allows you to take advantage of the existing network infrastructure instead of running wire from a "home base" location.
    b.The DVR uses coax connections to each of the analog cameras
    c.The NVR supports high resolution megapixel cameras
    d.The DVR supports only cameras with VGA resolution

Q: What is an Object Tracking Speed Dome?

A: Auto-object-tracking-speed-dome integrates features of optics, electronics, mechanism, information processing and network. It is composed by lens, dynamic actuator, movement controller as well as sync speed parts of image analysis, recognition, compression and communication. This kind dome has many functions, such as video record, position control, preset of direction and lens, moving target detection, recognition and track, as well as alarm of flame and smoke. When moving target is at surveillance area, DSP chip instantly counts differences between previous frame and present. When the differences index is up to certain point, some part of the image is considered as moving target, and then pan tilt receives command from dome. This reaction takes place again frame by frame so as to achieve continuous tracking of target moved. During whole process, it is unnecessary to both manually control and computer support.

Q: How to Install and Adjust the CCTV Cameras?

A: The use of cameras is very easy. Before it works, we should install the lens correctly, adjusting lens aperture, focus, and back focus, connect the signal cable and put through the power resource.

Q: How to Choose Lens?

A: If the camera is a human eye, the lens can be compared to eyeball; it is directly related to overseeing the proximity, scope and effectiveness of objects.
    The selection should be considered the following points:
    1) Lens the size of lens is same or bigger than the size of camera imaging surface.
    2) Selection of the suitable lens; the longer focus length, the greater distance overseen, the smaller the horizontal perspective, the more narrow the scope of the objects; vice verse.
    3) f=A×L/H (f-- lens focus length;A-- the size of camera's CCD;L-- the distance from the lens and the objects; H-- the height of the objects)
    4) Consider the change of light
    5) Considering the best-watched scope
    6) Lens' mount should be complied with cameras

Q: What is the difference between a Network Video Server and the Network Video Recorder?

A: The Video Server is similar to the Network Video Recorder (NVR) in that they both record the video. The Network Video Recorder comes with the VMS software already installed, while the Video Server does not include the VMS software. You can select the VMS you like and then load it on the Video Server. The Video Server usually runs Windows operating system and is more flexible than the NVR because it is easier to expand and add cameras. The NVR usually has a fixed limit to the number of cameras it will support.

Q: What is a Network Video Recorder (NVR)?

A: The Network Video Recorder (NVR) is a complete IP Camera recording device. It includes a computer and special software required to not only record the video but also allow many people to view real time and recorded video. The term evolved from the older DVR (or Digital Video Recorder). The NVR includes both the computer and special Video Management Software (VMS). The computer can use Windows, UNIX or Mac operating systems.

Q: What's The Difference Between An MJPEG IP Camera And A H.264 IP Camera?

A: Not all IP cameras are created equal. When looking for an IP camera, the single biggest difference between IP cameras is the video compression format and the two most popular types are MJPEG and H.264.
    In order for video footage to be transferred digitally across the internet, it needs to be compressed so that it saves bandwidth and can be transferred in a reasonable amount of time.
    Video compression (or encoding) is used to transfer video footage from one place to another in a way that is more efficient than it would otherwise be. The format of this compression needs to be widely understood and utilised so that cameras and the means of transferring the video are compatible.

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