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Science Manual – Using Video Images for Fisheries Monitoring 23

Figure 3.9: FishRev screen showing sizing of the fish from the previous figure.

Size information is displayed below the bottom right of the video screen.

3.7.3 Digital video motion detector (DVMD1-X), the image

analysis system

The DVMD is an image-tracking device produced and developed by Radiant, a

company based in Colorado, USA. The DVMD1-X is a stand-alone product with its

own built in digital signal processor. The DVMD operates as a switch, activating a

recording device when an object is detected that meets user-defined conditions.

The DVMD parameters are more comprehensive than Fishtick parameters. The user

is able to adjust the sensitivity of the DVMD, which is essentially motion detection. In

addition, there are target elimination settings such as direction elimination and

minimum/maximum speed. The DVMD unit may detect an object but will only track it

– that is, trigger an alarm – if it fulfills these target settings. DVMD user manuals can

be found in Appendix 9.

Each DVMD unit can only be used with one camera, although multiple DVMDs can

be networked together. It is not suitable for a quad feed because, unlike Fishtick, the

user is unable to set individual regions and configure each separately.

The development of a Windows module to interface with the DVMD was

commissioned by the Environment Agency as part of this project, because the DVMD

was of limited use without a record of events. A user guide for this interface is

included in Appendix 7. When an event is detected by the DVMD, an alarm is

triggered which outputs an analogue signal of the image and an “alarm file”. Based

on this output, the interface populates a .csv file with track data, time, date, plus other

relevant information from the alarm file and stores a linked video clip of the event.

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Radiant DVMD1 Manual do Utilizador Página 31