273
Fig. 17 An inset from the ‘drawing’ of Fig. 5: this shows the numbered outline of each Golden
Plover contributing to the count total
Text Box 6: The Process and Settings Used to Carry Out an Automatic
Count of a Golden Plover Flock in Flight (Fig. 5)
Open ImageJ, select ‘File’ ➾ ‘Open’ – and choose the image that you want to
analyse
When the image is open select ‘Image’ ➾ ‘Type’ ➾ ‘8-bit’
Then, again under the ‘Image’ menu select ‘Adjust’ ➾ ‘Threshold’ – this
will open a box containing the Threshold settings
Then select the appropriate Threshold settings, which, in the case of the
image of the Golden Plovers in flight, were as follows:
Top slider
– 122
Bottom slider
– 255
Default
Red.
Tick
Dark background’
Click on the apply button twice
Then go back to the main ImageJ toolbar and select ‘Analyze’ ➾ ‘Analyze
particles’ – this opens another box and the following settings were selected:
Size (pixel)
50 to infinity
Circularity
0.00–1.00
Show
Outlines
Tick
Display results
Click on OK
This will generate an Excel spreadsheet with the count details and an
image labelled ‘Drawing of + file name’ this shows the outlines (numbered)
of the Golden Plovers that contributed to the count total.
Improving the Accuracy of Bird Counts Using Manual and Automated Counts…
Fig. 17 An inset from the ‘drawing’ of Fig. 5: this shows the numbered outline of each Golden
Plover contributing to the count total
Text Box 6: The Process and Settings Used to Carry Out an Automatic
Count of a Golden Plover Flock in Flight (Fig. 5)
Open ImageJ, select ‘File’ ➾ ‘Open’ – and choose the image that you want to
analyse
When the image is open select ‘Image’ ➾ ‘Type’ ➾ ‘8-bit’
Then, again under the ‘Image’ menu select ‘Adjust’ ➾ ‘Threshold’ – this
will open a box containing the Threshold settings
Then select the appropriate Threshold settings, which, in the case of the
image of the Golden Plovers in flight, were as follows:
Top slider
– 122
Bottom slider
– 255
Default
Red.
Tick
Dark background’
Click on the apply button twice
Then go back to the main ImageJ toolbar and select ‘Analyze’ ➾ ‘Analyze
particles’ – this opens another box and the following settings were selected:
Size (pixel)
50 to infinity
Circularity
0.00–1.00
Show
Outlines
Tick
Display results
Click on OK
This will generate an Excel spreadsheet with the count details and an
image labelled ‘Drawing of + file name’ this shows the outlines (numbered)
of the Golden Plovers that contributed to the count total.
Improving the Accuracy of Bird Counts Using Manual and Automated Counts…