User manual

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