Velleman CAMZWBUL2 Instrukcja Użytkownika Pobierz pdf (Strona 38)

MJPEG

@200kbps

MPEG-4

@200kbps

H-264

@200kbps

CIF

100Fps

All Channels

CIF CIF

CIFCIF

4CIF

6.25Fps

CH1

CIF CIF

CIFCIF

4CIF

25Fps

All Channels 4CIF

CIF CIF

CIFCIF

4CIF

6.25Fps

CH2

CIF CIF

CIFCIF

4CIF

6.25Fps

CH3

CIF CIF

CIFCIF

4CIF

6.25Fps

CH4

CIF CIF CIF CIF CIF

100Fps

All Channels CH1 CH2 CH3 CH4

25Fps 25Fps 25Fps 25Fps

Diﬀ erent types of Digital Video Recorders (DVR)

- PC based DVRs are DVRs which have to be connected directly to a Windows®

based computer system. The DVR card can be connected to the PC via a USB

port or PCI slot depending on the type of the DVR.

This type of DVR is rather inexpensive as it shares power supply and hard disc

with the PC.





- Stand alone DVRs have their own CPU, hard disk and peripherals. These



          

      



The disadvantage is the higher cost because each DVR needs his own hard disk

and power supply.

Digital recording

- Compression format



video surveillance are MJPEG, MPEG-4 and H.264 (MPEG-4 part 10). H.264 is

a new standard for video compression which has more advanced compression

methods than the basic MPEG-4 compression. One of the advantages of H.264

      

MPEG-4 encoding. This high compression rate makes it possible to record

            

          



transmission

See example image:

Compression rate

The compression rate on most DVRs is adjustable. A low compression rate

gives a low bit-rate, but a low image quality



     

and super best.

Resolu on

Imagine a piece of graph paper. Every

    

       

        



704 x 480 pixels.











        







What happens is that the DVR draws a ‘grid’ over the image, and for each of







the reproduced image will be clearer.

Frame Rate

Frame Rate or Frame Frequency is the number of images a DVR can record per



          





25FPS is more suitable.

DVR Se ngs

             



capacity of a DVR.

E.g. A 4 channel DVR has a recording capacity of 100FPS in CIF format.

When recording 4 channels the recording capacity has to be divided by 4.

This means 100FPS/4channels = 25FPS in CIF format for each channel.



This means the DVR needs 4 CIF images for one FRAME format. The total

capacity of the 100FPS has to be divided by 4 to change into the 4CIF (or

Frame) format. When you want to record each channel of the 4 channel

DVR in 4CIF (or FRAME) format you have to divide the total 4CIF (or Frame)

capacity by 4.



 

 

So 25FPS /4CIF = 6.25FPS in FRAME or 4CIF format.

Very powerful processors make full frame DVRs possible. They can record

      

     

DVR4H2 and DVR4H3).

Recording method



    

are recorded by a user-

   

schedule.

    

are recorded when an

external alarm is triggered.

Possible alarm sensors

  

PIR sensors, photoelectric



    

   

The DVR records the video



It starts a few seconds



recorded. This is the most commonly used method to record video images.

DVR Op ons



USB mouse via the graphic user interface.

The DVRs have 2 video outputs, the basic composite video output, but also

the VGA video output for HD video images.





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