Quadrox WebCCTV Installation Manual
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WebCCTV Installation Manual 63Version 4.3 Series5.2.4 “Differential” live streamingIn order to further reduce the bandwidth requirements for live streaming, Quadrox engineershave devised an extra algorithm that can improve the JPEG streaming for analogue cameras.When using differential live streaming, only the parts of the image that actually changevisually are transmitted to the viewing component. At the receiver side, the parts of the imageare recombined into a full image. In terms of quality, this form of data size reduction canhardly be noticed, but the bandwidth is reduced drastically. This allows us to stream highquality video over a lower quality bandwidth.If you want to remotely access the WebCCTV video server over the Internet, it ishighly recommended to use differential streaming. Another possibility is using LowBandwidth streaming. More info can be found in the User Manual.This feature is not available for network cameras. Low Bandwidth streaming isavailable for both analogue and network camera’s.5.2.5 Activity detection for storageFor storage, we can apply a similar principle. Only the images that have meaningful activity inthem need to be stored. When nothing is happening, recording can be suspended. To betterdistinguish meaningful activity from “background movement” (e.g. a street nearby, a movingtree), masking can be applied to take only certain parts of the image into account.This technique not only reduces the storage requirement, but also makes it much easier to traceimportant events in the recordings afterwards, saving you both money (hardware) and time.Using activity detection is highly recommended in almost all cases. Typically, it allows you toincrease storage time up to 400%. For cameras with little motion, e.g. in an empty hallway inan industrial facility, it can even reduce the storage space to about 1% of the original volume! |
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