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Science Manual – Using Video Images for Fisheries Monitoring 31

Results

The data were recorded as MPEG4 video files (Figure 13) and played back through

Fishtick and the DVMD. The parameters used are detailed in Table 5.1 and 5.2. The

performance exhibited by Fishtick was good for this application, with 94 per cent of

targets detected. DVMD assessment was disappointing in terms of efficiency (49 per

cent) and was particularly poor in detecting fish in shoals. The DVMD system should

be able to track multiple fish passing through, but struggled when there were multiple

targets at various ranges from the camera against a relatively low contrast

background. For full details of the results, see Washburn (2007).

Figure 13: Some examples of the images collected at Town Weir fish pass

using a sideways camera and light panel on the bed of the fish pass

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Radiant DVMD1 Manual de usuario Pagina 39