Documentation for Intellect 4.10.4. Documentation for other versions of Intellect is available too.
Intellect™ system allows saving the video recordings to the hard drives (maintain video recordings archive). Archived information can be saved to the hard drives of such types as SCSI, IDE, SATA, USB and also RAID arrays. SCSI disks and RAID arrays (in particular RAID-5) allow accelerating data search and recording.
The size of the redundant array defines the length (time based length) of the saved and archived video recording. The size of the redundant array is selected based on the required parameters of the video recording.
Table below shows the average frame size of a PAL video signal depending on frame resolution, video signal compression, color grade of the image and frame resolution, frame chromaticity and motion level in the frame.
Video card type
Frame size (Kb) with 50% of motion in the frame
Frame size (Kb) with 75% of motion in the frame
Frame size (Kb) with 100% of motion in the frame
SC3B0N16 ( WS216)
To calculate required disk space for these cards, please use the on-line calculator.
SC200Q4 LOW PROFILE (FS115)
SC330Q16 (analogue of SC300Q16)
SC330D16 (analogue of SC300D16)
Archive size will be calculated on the basis of frame resolution and compression, image color grade, rate of video signal frames per second, number of cameras, recording events continuously to the hard drives.
Archive size can be calculated from formula no. 1:
Archive size (days) = (1024 (Mb/Gb) * 1024 (Kb/Mb) * Hard drive size (Gb)) / (60 (sec/min) * 60 (min/hr) * 24 (hr/day) * Frame size (Kb) * Frame rate (frames/sec) * Number of cameras)
Comments relating to Formula no. 1. To estimate the archive size, the following should be performed: the size of hard drive in Kb (the rates for converting Gb into Kb are included into the numerator of Formula no. 1) divide by the frame size, defined in Table A as a function of video signal parameters, and by the frame rate per camera and the number of cameras, connected to the video server. Archive size in this case will be measured in seconds. Now, the archive size expressed in seconds should be converted to the number of days (the rates to convert seconds to days are given in the denominator of Formula no. 1).
Archive size can also be calculated from a simplified formula, where numerical conversion factors are reduced to a numerical value (Formula no 2).
Archive size (days) = 12 (Kb/Gb * day/sec) * Hard drive size (Gb) / ( Frame size (Kb) * Frame rate (frames/sec) * Number of cameras)
Example. If the size of a hard drive, for instance, is 40 GB, 4 cameras are continuously recording PAL video signals with 10 frames per second and 150Kb frame size. Based on the formula, you work out:
Archive size (days) = 12 (Kb/Gb * day/sec) * 40 (Gb) / ( 150 (Kb) * 10 (frames/sec) * 4) = 0.08 (days)
The arithmetic calculation shows, that the video archive size in the particular case will be 0.08 days (about 1 hour 55 minutes).
For the purpose of calculations, frame size can be defined in the table above.
Table below shows archive sizes calculated for hard drives of various sizes, based on a continuous incoming PAL video signal recording, from 1 camera with a frame rate of 25 f/sec.
Hard drive size
352 x 288 color
704 x 288 color
704 x 576 color