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Science Manual – Using Video Images for Fisheries Monitoring 17

Figure 3.6: A low-budget underwater bullet camera with 30 m of cable

3.5 Recording hardware

3.5.1 Mains-powered recording hardware

The best option for recording data is a computer-based recording system consisting

of a digital video recorder (DVR) card installed in a PC. The files can be recorded

onto an external or removable hard drive so that the data are portable and easy to

take back to the office for analysis or transfer to another machine if necessary.

Following analysis, the data can be copied in entirety onto an archive drive, short

sections of the movie file can be selected and stored or if there is no reason to store

the information, the data can be wiped off the hard drive.

A basic computer-based digital video system consists of a desktop PC with a DVR

card, such as the SuperDVR card produced by Voltek (Table 3.4), installed. The

DVR card may require a certain PC specification including a particular standard of

graphics card or the equivalent onboard graphics facilities, so be sure to check what

is required before you buy. These cards will record files in MPEG4 format, which is a

widely used digital video standard, so that the data are compatible with image

processing software. The DVR cards are supplied with easy-to-use software with

which to program the required settings. The user can change the frame rate at which

the file is recorded, set up a recording schedule, change the resolution and alter

other settings as required.

• MAINS-POWERED RECORDING

HARDWARE (PC + DVR card)

• 12-VOLT RECORDING HARDWARE

Low-power digital video recorders

Low-power computers

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