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24 Science Manual – Using Video Images for Fisheries Monitoring

The display contains an editable data table (in .csv file format) and a display window

in which a video clip can be viewed (Figure 3.10). The table is a summary of all of

the ‘tracked events’, providing a record of data for each of the events tracked by the

DVMD. The user can scroll down through list and, as each event is selected, the

video clip from the event is displayed in the window (Figure 3.10). The table is

editable via this interface, allowing the user to alter the field values and add species,

size and direction information. These changes can then be saved to the underlying

file. Non-fish events can be marked within the interface display window and deleted

in either Access or Excel.

A Falcon framegrabber card is required to record images using the DVMD interface.

Details of how to install both the card and the interface are provided in Appendix 6.

Figure 3.10: DVMD Interface program showing the data table and video clip of

the selected event.

3.7.4 Which software platform to apply?

At present, we recommend the use of Fishtick. However, both platforms can be used

to obtain a count of fish, with 90 per cent efficiency, faster than “blind” watching.

Despite the high false detection rate, Fishtick can obtain a count faster than DVMD.

There are certain situations where the DVMD will be suitable, such as for high image

quality and/or downward-looking cameras. Ongoing developments may make it more

widely applicable. For current advice, see the Contacts Section.

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Radiant DVMD1 Manual de usuario Pagina 32