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22 Science Manual – Using Video Images for Fisheries Monitoring

relatively uniform. In less optimal conditions, the motion detection algorithm will

function better.

The captured images are stitched together and recorded to a new video file. FishRev

allows the user to play this file back and add fish to an Excel spreadsheet using the

fish up and down arrow keys at the bottom of the screen (Figure 3.8). The species

and direction of movement are added at this stage and the user may also add size

information if required (Figure 3.9). The Excel spreadsheet generated contains the

date, time, species, direction of movement and size information for each fish added.

Fishtick can be used either on site with a live camera feed or on pre-recorded video

data (digital or analogue). Pre-recorded files are played back at a much faster rate

than that at which they were recorded without affecting the probability of detection.

Exactly how much faster depends on the speed of the PC being used and the frame

rate of the video files. It is also possible to analyse data collected using a quad or

multiplexer with four cameras attached because Fishtick allows up to four regions of

interest, each with their own configurable parameter settings, to be created.

Figure 3.8: FishRev screen showing playback of a file collected from a

resistivity counter site on the River Tamar at Gunnislake

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Radiant DVMD1 Manual de usuario Pagina 30