269
Fig. 13 An enlarged inset from the drawing generated during an automatic count in ImageJ
(Fig. 12). This shows the numbered outlines of birds that contributed to the count, including some
overlapping birds in the lower right quarter
Fig. 14 An aerial image of wintering Greater Flamingos feeding in a lagoon at Doñana NP. An
automatic count of these birds in ImageJ indicated that 215 birds were present in the image, a
manual count for validation purposes revealed 214 Greater Flamingos. Camera model – Canon
EOS 7D, Lens – Canon 35 mm, ISO 400, F-stop f/8, Exposure time 1/500 s
matic count generating an estimate of 215 birds, compared to the manual count of
214 birds.
In practice, a manual count is the most appropriate for this type of image, as this
would be 99%–100% accurate and take no more than 10 min to complete (Fig. 15).
Improving the Accuracy of Bird Counts Using Manual and Automated Counts…
Fig. 13 An enlarged inset from the drawing generated during an automatic count in ImageJ
(Fig. 12). This shows the numbered outlines of birds that contributed to the count, including some
overlapping birds in the lower right quarter
Fig. 14 An aerial image of wintering Greater Flamingos feeding in a lagoon at Doñana NP. An
automatic count of these birds in ImageJ indicated that 215 birds were present in the image, a
manual count for validation purposes revealed 214 Greater Flamingos. Camera model – Canon
EOS 7D, Lens – Canon 35 mm, ISO 400, F-stop f/8, Exposure time 1/500 s
matic count generating an estimate of 215 birds, compared to the manual count of
214 birds.
In practice, a manual count is the most appropriate for this type of image, as this
would be 99%–100% accurate and take no more than 10 min to complete (Fig. 15).
Improving the Accuracy of Bird Counts Using Manual and Automated Counts…