The automatic laser point detection is used to determine the visual footprint of images.
For many collections of benthic images a geometric laser point pattern is used to determine the pixel-to-centimetre ratio of displayed sea floor. BIIGLE can assist in the evaluation of your data and provides a method [1] to automatically detect laser points and compute the visual footprint of the images.
Before you can start the automatic laser point detection you have to manually annotate a few example laser points with point annotations in your images. You have to annotate at least 4 images this way. BIIGLE currently supports the following types of geometric laser point patterns:
You can also annotate the laser points on all of your images manually. In this case BIIGLE will skip the automatic detection and will directly compute the visual footprint of the images. This is the most accurate method to determine the visual footprint but it may be very time consuming.
The laser point detection and visual footprint calculation can be requested for a whole image volume in the volume overview. Open the laser point tab in the sidebar on the left (), select the label that you have used to annotate the (example) laser points, enter the distance of the laser points in centimetre and submit your request.
Depending on the size of your volume, the automatic laser point detection may take some time. You can check the progress using the "detected laser points" filter of the volume overview. This will show you all images where the automatic laser point detection was successful. You can view the detailed results for an individual image on the image information page (). Here you can also (re-)submit the laser point detection for an individual image.
If you choose to detect laser points automatically, make sure you check the results before further processing your data. The easiest way is to apply the "detected laser points" filter in the image volume overview and then cycle through all images that contain automatically detected laser points using the image annotation tool. Detected laser points will be displayed as small circles on the image. If the detected laser points were not correct for an image, annotate them manually and resubmit the laser point detection for the image.