Photogrammetric data of spherical target test fields

This data publication contains photogrammetric data of test fields of spheres.

Please download the zip files and extract them. There are three experiments:

1. Experiment 1 (in "experiment1.zip"): A test field with 5 x 5 white spheres on a black background. The spheres have diameters of 38 mm and 40 mm. The grid size is approximately 6 cm, see "sphere_ids_exp1.png". A bundle of nine images (see "image_orientations.png" in "test_images_and_camera_information_experiment1.zip") was recorded.

- "image_bundle_tif_experiment1.zip" contains the images with tif format. The images are also available in jpg format ("image_bundle_jpg99_experiment1.zip").
- "image_ellipse_measurement_LoG7_starOperator_exp1.txt" contains the image measurements with the ellipse operator (star operator): id_image, id_sphere, ellipse center, semimajor and semiminor axes, inclination and error measures
- "image_ellipse_contourpoints_LoG7_starOperator_exp1.txt" contains the image measurements with the ellipse operator (star operator) with all ellipse contour points (id_image, id_sphere, x, y)
- The folder "3D_structured_light_scan" contains the results of a structured light scan using GOM ATOS scanner ( "sphere_measurement_GOM_ATOS_exp1.ply" with mesh, "spheres_3D_structured_light_scanner_cloudcompare_tab_exp1.txt" with extracted sphere center coordinates and radii as well as RMS of the residuals of the fit).

2. Experiment 2 (in "experiment2.zip"): See decription of experiment 1. In this case, there are 16 further spheres of 4 mm diameter on the test field, see "sphere_ids_exp2.png".

3. Experiment 3 (in "experiment3.zip"): Compared to experiment 1, there two scale bars are part of the measurements, see "image_orientations_exp3.png". There is also an image bundle ("image_bundle_tif_experiment3.zip" or "image_bundle_jpg99_experiment3.zip" and the image ellipse measurements ("image_ellipse_measurement_LoG7_starOperator_exp3.txt" and "image_ellipse_contourpoints_LoG7_starOperator_exp3.txt").

The 3D structured light scans are only done for the scale bars to measure radii and distances.