Photogrammetric data of spherical target test fields

Abstract

This data publication contains photogrammetric data of test fields of spheres. Please download the zip files and extract them. There are three experiments:

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).

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".

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.