*************README file for******************** HYPA-r: Hydrodynamic patterns dataset (raw data) ************************************************ Last modified: 2024-01-08 (yyyy-mm-dd) This dataset was generated by Pauline Rothmann-Brumm (2023) as part of her dissertation at the Technical University of Darmstadt, Germany. Title of the dissertation: Visualisierung, Analyse und Modellierung von fluiddynamischen Musterbildungsphänomenen im Zylinderspalt unter Anwendung von Maschinellem Lernen (German) / Visualization, analysis and modeling of fluid dynamic pattern formation phenomena in the cylinder gap using machine learning (English translation) --------------------- DATASET DESCRIPTION URL: https://tudatalib.ulb.tu-darmstadt.de/handle/tudatalib/3840 The HYPA-r dataset contains raw image data of a variety of gravure printed patterns. The raw image data is created by high-resolution scanning of printed samples from industrial gravure printing web-presses. Pattern types, which are represented in the dataset, are dot patterns, finger patterns and mixed patterns. The HYPA-r dataset mainly aims at data-driven analysis of hydrodynamic pattern formation in gravure printing. HYPA-r stands for hydrodynamic patterns. The suffix -r stands for raw data. In the related HYPA-p dataset (see https://tudatalib.ulb.tu-darmstadt.de/handle/tudatalib/3841), the corresponding processed (-p) image data can be found. --------------------- METADATA Here, only a selection of the metadata is given, the full metadata of the HYPA-r dataset can be found in the dissertation of Pauline Rothmann-Brumm. The dataset consists of 1,672 single TIFF-images, grouped into 21 ZIP-folders. Each ZIP-folder belongs to a specific printing experiment (e.g. G1-01). Beware that the ZIP-folders are relatively large (between 230 and 340 GB), see also section DOWNLOAD! Resolution of all images is 2,400 pixel per inch (ppi) (= 10.5833 micrometer/pixel) at a total size of 20,400 pixel x 28,080 pixel per image. The substrate running direction in the printing machine is marked with an arrow (left to right) on the samples. The printing direction is, per definition, the opposite direction (from right to left). The TIFF-images are named according to their printing parameters. Example: G1-01_WCPvbam_V005_ESA0_L01.tif G1-01 --> Name of the printing experiment. G1-01: G1 stands for the first printing day at the Gallus printing machine, -01 stands for the first velocity ramp. For more information see the dissertation of Pauline Rothmann-Brumm. WCPvbam --> Character string that encodes printing parameters of the printing experiment. WCPvbam: Water (W) based ink on coated paper (CP). Ink with base (= very high) viscosity (vb). Medium doctor blade angle (am). For more information see the dissertation of Pauline Rothmann-Brumm. V005 --> Printing velocity of 5 m/min. Other used printing velocities: 10, 15, 30, 60, 90, 120, 180 and 240 m/min. ESA0 --> ESA0: Electrostatic printing assist (ESA) off. ESA1: ESA on. L01 --> Type and number of sample. L: Samples with 4 large fields. S: Samples with 80 small fields. The used electromechanically-engraved printing form has tonal values between 5 and 100 %, raster frequencies of 60, 70, 80 and 100 lines/cm, and a raster angle of 59.35°, which corresponds to HELL raster angle #2 (HELL Gravure Systems GmbH & Co. KG, Kiel, Germany). The stylus angle for engraving is 120°. --------------------- DOWNLOAD Before downloading the dataset, please take care that your hard drive has enough free space, since the dataset is very large! Eventually change the download path within your browser to an external hard drive. To get a quick impression of the dataset, two example-images are provided separately for download ('G1-01_WCPvbam_V005_ESA0_L01.tif' and 'G1-01_WCPvbam_V005_ESA0_S01.tif'). However, the example-images are still rather large (each is 3.2 GB), so download will take some minutes and opening of the file also takes some time, depending on the used software and device. The printing parameters of the example-images can be derived from the filename. --------------------- CONTACT Pauline Rothmann-Brumm Technical University of Darmstadt, Department of Mechanical Engineering, Institute of Printing Science and Technology (IDD), Magdalenenstr. 2, 64289 Darmstadt, Germany rothmann-brumm@idd.tu-darmstadt.de