Browsing by Author "Liebold, Frank"

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Open Access
Photogrammetric data of circular target test fields for eccentricity analysis
(Technische Universität Dresden, 2026-01-30) Liebold, Frank
This data publication contains photogrammetric data of test fields of circles. Please download the zip files and extract them. There are three experiments: Experiment 1 (in "exp1_planar_test_field.zip"): A planar test field with 20 concentric circle targets. The 12 larger circles have inner radii of 15mm, outer radii of 30mm and a grid size of 67mm. There are 8 further smaller circles (inner radius: 3mm, outer radius: 6mm). A bundle of 12 images (see "image_orientations.png" in "images_planar_test_field.zip") was recorded. Experiment 2 (in "exp2_nonplanar_test_field.zip"): A nonplanar test field with 60 concentric circle targets with inner radii of 13mm and outer radii of 26mm. A bundle of 12 images (see "image_orientations.png" in "images_nonplanar_test_field.zip") was recorded. Experiment 3 (in "exp3_scale_bar_comparison.zip"): There three subexperiments with different circular target radii (5mm, 7.5mm, 10mm). Additionally, there is a scale bar with 2 targets with a radius of 5mm. For each subexperiment, a bundle of 12 images (see "image_orientations.png" in "test_field_radius_*mm/images_scale_bar_comparison_radius_*mm.zip") was recorded. The planar test fields have 127 circular targets. In addition to the 127 targets, there are the two scale bar radii. All folders contain: 1) the initial values of the image orientaions with the projection center coordinates and the rotation angles. rotMat = [[cosPhi*cosKappa, -cosPhi*sinKappa, sinPhi],\ [cosOmega*sinKappa + sinOmega*sinPhiCosKappa,\ cosOmega*cosKappa - sinOmega*sinPhiSinKappa,\ -sinOmega*cosPhi],\ [sinOmega*sinKappa - cosOmega*sinPhiCosKappa,\ sinOmega*cosKappa + cosOmega*sinPhiSinKappa,\ cosOmega*cosPhi]]) 2) the image measurements in pixels: ellipse center x,y (pixel coordinate system in the left upper pixel, x to the right, y points down), semi-axes a and b. Star operator was used (edge detection with Laplacian of Gauss filter). 3) contour point coordinates of the star operator measurements. 4) initial circle parameters 5) for experiment 2 and 3: there is a additional pin file that contains the assignment of the image numbers and image names.
Open Access
Photogrammetric data of spherical target test fields
(Technische Universität Dresden, 2025-07-22) Liebold, Frank
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.