Researcher basic information

• https://researchmap.jp/stefanbaar?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202401014045514370
• https://orcid.org/0000-0003-4392-3844
• https://stefanbaar.com

• 00793879

• https://orcid.org/0000-0003-4392-3844

• 202401014045514370

• image processing, machine Learning, 3D reconstruction, mathematical modelling, microscopy, UAV

• Natural Science, Magnetism, superconductivity and strongly correlated systems, STM/S, image processing, signal proceesing
• Natural Science, Astronomy, cosmology, radio, galaxy clusters, comets
• Informatics, Mathematical informatics, regression, mathematical modelling, differential geometry
• Informatics, Computational science, image processing, object segmentation, photometry, 3D reconstruction, signal processing

Research activity information

• Mar. 2020, PASJ, PASJ Excellent Paper Award 2019
  Kilonova from post-merger ejecta as an optical and near-infrared counterpart of GW170817
  M. Tanaka;Y. Utsumi;P. A Mazzali;N. Tominaga;M. Yoshida;Y. Sekiguchi;T. Morokuma;K. Motohara;K. Ohta;K. S Kawabata;F. Abe;K. Aoki;Y. Asakura;S. Baar;S. Barway;I A Bond;M. Doi;T. Fujiyoshi;H. Furusawa;S. Honda;Y. Itoh;M. Kawabata;N. Kawai;J. Hoon Kim;C. Lee;S. Miyazaki;K. Morihana;H. Nagashima;T. Nagayama;T. Nakaoka;F. Nakata;R. Ohsawa

• Tomato Growth Monitoring and Phenological Analysis Using Deep Learning-Based Instance Segmentation and 3D Point Cloud Reconstruction
  Warut Timprae; Tatsuki Sagawa; Stefan Baar; Satoshi Kondo; Yoshifumi Okada; Kazuhiko Sato; Poltak Sandro Rumahorbo; Yan Lyu; Kyuki Shibuya; Yoshiki Gama; Yoshiki Hatanaka; Shinya Watanabe
  Sustainability, 12 Nov. 2025
  Scientific journal
• High-Precision Detection of Cells and Amyloid-β Using Multi-Frame Brightfield Imaging and Quantitative Analysis
  Mengyu Li; Masahiro Kuragano; Stefan Baar; Mana Endo; Kiyotaka Tokuraku; Shinya Watanabe
  Electronics, 27 Aug. 2025
  Scientific journal
• A logistic model for precise tomato fruit-growth prediction based on diameter-time evolution
  Stefan Baar; Yosuke Kobayashi; Tatsuro Horie; Kazuhiko Sato; Satoshi Kondo; Shinya Watanabe
  Computers and Electronics in Agriculture, 227, 109500, 109500, Elsevier BV, Dec. 2024
  Scientific journal
• Filtrate Estimation from Filter Press Process in a Water Treatment Facility based on Image Analysis
  Poltak Sandro Rumahorbo; Stefan Baar; Satoshi Kondo; Nobuhiro Yazawa; Hiroki Ito; Jun Sugimoto; Yoshifumi Okada; Kazuhiko Sato; Shinya Watanabe
  2024 Joint 13th International Conference on Soft Computing and Intelligent Systems and 25th International Symposium on Advanced Intelligent Systems (SCIS&ISIS), 1, 6, IEEE, 09 Nov. 2024
  International conference proceedings
• Tomato Fruit Evolution and Maturity estimation from RGB Time-lapse Observation via Modern Structure from Motion and Instance Segmentation
  Stefan Baar; Yosuke Kobayashi; Shinya Watanabe
  2024 Joint 13th International Conference on Soft Computing and Intelligent Systems and 25th International Symposium on Advanced Intelligent Systems (SCIS&ISIS), 1, 6, IEEE, 09 Nov. 2024
  International conference proceedings
• Combining Close Range UAVs and Gaussian Splatting for High-Speed Tomato Leaf Size Estimation and Counting
  Stefan Baar; Yosuke Kobayashi; Shinya Watanabe
  2024 IEEE 13th Global Conference on Consumer Electronics (GCCE), 215, 218, IEEE, 29 Oct. 2024
  International conference proceedings
• Fiduciary-Free Frame Alignment for Robust Time-Lapse Drift Correction Estimation in Multi-Sample Cell Microscopy
  Stefan Baar; Masahiro Kuragano; Naoki Nishishita; Kiyotaka Tokuraku; Shinya Watanabe
  Journal of Imaging, 10, 8, Aug. 2024
  Scientific journal
• Quantitative Evaluation of Neurite Morphology Using Graph Structure
  Fumiya Chikudo; Stefan Baar; Ayaka Ota; Masahiro Kuragano; Kiyotaka Tokuraku; Shinya Watanabe
  Electronics (Switzerland), 12, 23, Dec. 2023
  Scientific journal
• Feature extraction of flame images using self-attention model
  Koki Hashiyada; Baar Stefan; Kentaro Sakakibara; Nobuhiro Yazawa; Yosuke Kobayashi
  2023 IEEE 12th Global Conference on Consumer Electronics (GCCE), 767, 768, IEEE, 10 Oct. 2023
  International conference proceedings
• Towards a comprehensive approach for characterizing cell activity in bright-field microscopic images
  Stefan Baar; Masahiro Kuragano; Kiyotaka Tokuraku; Shinya Watanabe
  Scientific Reports, 12, 1, Dec. 2022
  Scientific journal
• Non-destructive Leaf Area Index estimation via guided optical imaging for large scale greenhouse environments
  Stefan Baar; Yosuke Kobayashi; Tatsuro Horie; Kazuhiko Sato; Hidetsugu Suto; Shinya Watanabe
  Computers and Electronics in Agriculture, 197, Jun. 2022
  Scientific journal
• Tomato fruit maturity estimation from RGB images
  Stefan Baar; Yosuke Kobayashi; Tatsuro Horie; Kazuhiko Sato; Shinya Watanabe
  GCCE 2022 - 2022 IEEE 11th Global Conference on Consumer Electronics, 615, 616, 2022
  International conference proceedings
• High polarization degree of the continuum of comet 2P/Encke based on spectropolarimetric signals during its 2017 apparition
  Y. G. Kwon; M. Ishiguro; Y. Shinnaka; T. Nakaoka; D. Kuroda; H. Hanayama; J. Takahashi; S. Baar; T. Saito; M. Kawabata; M. Uemura; T. Morokuma; K. L. Murata; S. Takagi; K. Morihana; T. Nagayama; K. Sekiguchi; K. S. Kawabata; H. Akitaya
  Astronomy and Astrophysics, 620, 01 Dec. 2018
  Scientific journal
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
  Yousuke Utsumi; Masaomi Tanaka; Nozomu Tominaga; Michitoshi Yoshida; Sudhanshu Barway; Takahiro Nagayama; Tetsuya Zenko; Kentaro Aoki; Takuya Fujiyoshi; Hisanori Furusawa; Koji S. Kawabata; Shintaro Koshida; Chien Hsiu Lee; Tomoki Morokuma; Kentaro Motohara; Fumiaki Nakata; Ryou Ohsawa; Kouji Ohta; Hirofumi Okita; Akito Tajitsu; Ichi Tanaka; Tsuyoshi Terai; Naoki Yasuda; Fumio Abe; Yuichiro Asakura; Ian A. Bond; Shota Miyazaki; Takahiro Sumi; Paul J. Tristram; Satoshi Honda; Ryosuke Itoh; Yoichi Itoh; Miho Kawabata; Kumiko Morihana; Hiroki Nagashima; Tatsuya Nakaoka; Tomohito Ohshima; Jun Takahashi; Masaki Takayama; Wako Aoki; Stefan Baar; Mamoru Doi; Francois Finet; Nobuyuki Kanda; Nobuyuki Kawai; Ji Hoon Kim; Daisuke Kuroda; Wei Liu; Kazuya Matsubayashi; Katsuhiro L. Murata; Hiroshi Nagai; Tomoki Saito; Yoshihiko Saito; Shigeyuki Sako; Yuichiro Sekiguchi; Yoichi Tamura; Masayuki Tanaka; Makoto Uemura; Masaki S. Yamaguchi
  Publications of the Astronomical Society of Japan, 69, 6, 01 Dec. 2017
• Kilonova from post-merger ejecta as an optical and near-Infrared counterpart of GW170817
  Masaomi Tanaka; Yousuke Utsumi; Paolo A. Mazzali; Nozomu Tominaga; Michitoshi Yoshida; Yuichiro Sekiguchi; Tomoki Morokuma; Kentaro Motohara; Kouji Ohta; Koji S. Kawabata; Fumio Abe; Kentaro Aoki; Yuichiro Asakura; Stefan Baar; Sudhanshu Barway; Ian A. Bond; Mamoru Doi; Takuya Fujiyoshi; Hisanori Furusawa; Satoshi Honda; Yoichi Itoh; Miho Kawabata; Nobuyuki Kawai; Ji Hoon Kim; Chien Hsiu Lee; Shota Miyazaki; Kumiko Morihana; Hiroki Nagashima; Takahiro Nagayama; Tatsuya Nakaoka; Fumiaki Nakata; Ryou Ohsawa; Tomohito Ohshima; Hirofumi Okita; Tomoki Saito; Takahiro Sumi; Akito Tajitsu; Jun Takahashi; Masaki Takayama; Yoichi Tamura; Ichi Tanaka; Tsuyoshi Terai; Paul J. Tristram; Naoki Yasuda; Tetsuya Zenko
  Publications of the Astronomical Society of Japan, 69, 6, 01 Dec. 2017
  Scientific journal
• 1/8 Anomaly Induced by the Substitution of Dy in Underdoped Bi2Sr2Ca1−xDyxCu2O8+δ
  K. Kawamura; Y. Kobayashi; C. Kobashi; S. Baar; T. Kurosawa; M. Oda; M. Ido; N. Momono
  Journal of Superconductivity and Novel Magnetism, 30, 8, 2037, 2042, 01 Aug. 2017
  Scientific journal
• Multi-messenger observations of a binary neutron star merger
  B. P. Abbott; R. Abbott; T. D. Abbott; F. Acernese; K. Ackley; C. Adams; T. Adams; P. Addesso; R. X. Adhikari; V. B. Adya; C. Affeldt; M. Afrough; B. Agarwal; M. Agathos; K. Agatsuma; N. Aggarwal; O. D. Aguiar; L. Aiello; A. Ain; P. Ajith; B. Allen; G. Allen; A. Allocca; P. A. Altin; A. Amato; A. Ananyeva; S. B. Anderson; W. G. Anderson; S. V. Angelova; S. Antier; S. Appert; K. Arai; M. C. Araya; J. S. Areeda; N. Arnaud; K. G. Arun; S. Ascenzi; G. Ashton; M. Ast; S. M. Aston; P. Astone; D. V. Atallah; P. Aufmuth; C. Aulbert; K. AultONeal; C. Austin; A. Avila-Alvarez; S. Babak; P. Bacon; M. K.M. Bader; S. Bae; P. T. Baker; F. Baldaccini; G. Ballardin; S. W. Ballmer; S. Banagiri; J. C. Barayoga; S. E. Barclay; B. C. Barish; D. Barker; K. Barkett; F. Barone; B. Barr; L. Barsotti; M. Barsuglia; D. Barta; S. D. Barthelmy; J. Bartlett; I. Bartos; R. Bassiri; A. Basti; J. C. Batch; M. Bawaj; J. C. Bayley; M. Bazzan; B. Bécsy; C. Beer; M. Bejger; I. Belahcene; A. S. Bell; B. K. Berger; G. Bergmann; J. J. Bero; C. P.L. Berry; D. Bersanetti; A. Bertolini; J. Betzwieser; S. Bhagwat; R. Bhandare; I. A. Bilenko; G. Billingsley; C. R. Billman; J. Birch; R. Birney; O. Birnholtz; S. Biscans; S. Biscoveanu; A. Bisht; M. Bitossi; C. Biwer
  Astrophysical Journal Letters, 848, 2, 01 Jan. 2017
  Scientific journal
• Out-of-plane disorder effects on the energy gaps and electronic charge order in Bi2Sr1.7R0.3CuO6+δ (R = La and Eu)
  Tohru Kurosawa; Kohsaku Takeyama; Stefan Baar; Yuto Shibata; Moeko Kataoka; Shusei Mizuta; Hiroshi Yoshida; Naoki Momono; Migaku Oda; Masayuki Ido
  Journal of the Physical Society of Japan, 85, 4, 15 Apr. 2016
  Scientific journal
• The Impurity Effects on the Superconducting Gap in the High- Tc Superconductor Bi2Sr2CaCu2−xFexO8 + δ Investigated by STM/STS
  S. Baar; N. Momono; K. Kawamura; Y. Kobayashi; S. Iwasaki; T. Sakawaki; Y. Amakai; H. Takano; T. Kurosawa; M. Oda; M. Ido
  Journal of Superconductivity and Novel Magnetism, 29, 3, 659, 662, 01 Mar. 2016
  Scientific journal
• Nodal gap behavior of Bi2Sr2-xLnxCuO6+δ (Ln = La, Eu) investigated by specific heat measurements
  M. Shimizu; Y. Moriya; S. Baar; N. Momono; Y. Amakai; H. Takano; S. Murayama; T. Kurosawa; M. Oda; M. Ido
  International Journal of Modern Physics B, 29, 25-26, 20 Oct. 2015
  International conference proceedings
• Impurity Effects on the Energy Gap in Fe-doped Bi2212
  Stefan Baar; N. Momono; J. Suzuki; J. Soda; K. Kobayashi; H. Takano; Y. Amakai; T. Kurosawa; M. Oda; M. Ido
  Physics Procedia, 75, 18, 22, 2015
  International conference proceedings
• A POSSIBLE DETECTION OF OCCULTATION BY A PROTO-PLANETARY CLUMP IN GM Cephei
  W. P. Chen; S. C.-L. Hu; R. Errmann; Ch. Adam; S. Baar; A. Berndt; L. Bukowiecki; D. P. Dimitrov; T. Eisenbeiß; S. Fiedler; Ch. Ginski; C. Gräfe; J. K. Guo; M. M. Hohle; H. Y. Hsiao; R. Janulis; M. Kitze; H. C. Lin; C. S. Lin; G. Maciejewski; C. Marka; L. Marschall; M. Moualla; M. Mugrauer; R. Neuhäuser; T. Pribulla; St. Raetz; T. Röll; E. Schmidt; J. Schmidt; T. O. B. Schmidt; M. Seeliger; L. Trepl; C. Briceño; R. Chini; E. L. N. Jensen; E. H. Nikogossian; A. K. Pandey; J. Sperauskas; H. Takahashi; F. M. Walter; Z.-Y. Wu; X. Zhou
  The Astrophysical Journal, 751, 2, 118, 118, American Astronomical Society, 14 May 2012
  Scientific journal
• A new flare star member candidate in the Pleiades cluster
  M. Moualla; T.O.B. Schmidt; R. Neuhäuser; V.V. Hambaryan; R. Errmann; L. Trepl; Ch. Broeg; T. Eisenbeiss; M. Mugrauer; C. Marka; C. Adam; C. Ginski; T. Pribulla; S. Rätz; J. Schmidt; A. Berndt; G. Maciejewski; T. Röll; M.M. Hohle; N. Tetzlaff; S. Fiedler; S. Baar
  Astronomische Nachrichten, 332, 7, 661, 667, Wiley, 23 Aug. 2011
  Scientific journal, Abstract
  
  We present a new flare star, which was discovered during our survey on a selected field at the edge of the Pleiades cluster. The field was observed in the period 2007–2010 with three different CCD‐cameras at the University Observatory Jena with telescopes from 25 to 90 cm. The flare duration is almost one hour with an amplitude in the R‐band of about 1.08 mag. The location of the flare star in a color‐magnitude diagram is consistent with age and distance of the Pleiades. In the optical PSF of the flare star there are two 2MASS objects (unresolved in most images in the optical Jena PSF), so it is not yet known which one of them is responsible for this flare. The BVRIJHK colors yield spectral types of M1 and M2 with extinction being A_v = 0.231 ± 0.024 mag and A_v = 0.266 ± 0.020 for those two stars, consistent with the Pleiades cluster (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
• The Young Exoplanet Transit Initiative (YETI)
  R. Neuhäuser; R. Errmann; A. Berndt; G. Maciejewski; H. Takahashi; W.P. Chen; D.P. Dimitrov; T. Pribulla; E.H. Nikogossian; E.L.N. Jensen; L. Marschall; Z.‐Y. Wu; A. Kellerer; F.M. Walter; C. Briceño; R. Chini; M. Fernandez; St. Raetz; G. Torres; D.W. Latham; S.N. Quinn; A. Niedzielski; Ł. Bukowiecki; G. Nowak; T. Tomov; K. Tachihara; S.C.‐L. Hu; L.W. Hung; D.P. Kjurkchieva; V.S. Radeva; B.M. Mihov; L. Slavcheva‐Mihova; I.N. Bozhinova; J. Budaj; M. Vaňko; E. Kundra; Ł. Hambálek; V. Krushevska; T. Movsessian; H. Harutyunyan; J.J. Downes; J. Hernandez; V.H. Hoffmeister; D.H. Cohen; I. Abel; R. Ahmad; S. Chapman; S. Eckert; J. Goodman; A. Guerard; H.M. Kim; A. Koontharana; J. Sokol; J. Trinh; Y. Wang; X. Zhou; R. Redmer; U. Kramm; N. Nettelmann; M. Mugrauer; J. Schmidt; M. Moualla; C. Ginski; C. Marka; C. Adam; M. Seeliger; S. Baar; T. Roell; T.O.B. Schmidt; L. Trepl; T. Eisenbeiß; S. Fiedler; N. Tetzlaff; E. Schmidt; M.M. Hohle; M. Kitze; N. Chakrova; C. Gräfe; K. Schreyer; V.V. Hambaryan; C.H. Broeg; J. Koppenhoefer; A.K. Pandey
  Astronomische Nachrichten, 332, 6, 547, 561, Wiley, 12 Jul. 2011
  Scientific journal, Abstract
  
  We present the Young Exoplanet Transit Initiative (YETI), in which we use several 0.2 to 2.6‐m telescopes around the world to monitor continuously young (≤100 Myr), nearby (≤1 kpc) stellar clusters mainly to detect young transiting planets (and to study other variability phenomena on time‐scales from minutes to years). The telescope network enables us to observe the targets continuously for several days in order not to miss any transit. The runs are typically one to two weeks long, about three runs per year per cluster in two or three subsequent years for about ten clusters. There are thousands of stars detectable in each field with several hundred known cluster members, e.g. in the first cluster observed, Tr‐37, a typical cluster for the YETI survey, there are at least 469 known young stars detected in YETI data down to R = 16.5 mag with sufficient precision of 50 millimag rms (5 mmag rms down to R = 14.5 mag) to detect transits, so that we can expect at least about one young transiting object in this cluster. If we observe ∼10 similar clusters, we can expect to detect ∼10 young transiting planets with radius determinations. The precision given above is for a typical telescope of the YETI network, namely the 60/90‐cm Jena telescope (similar brightness limit, namely within ±1 mag, for the others) so that planetary transits can be detected. For targets with a periodic transit‐like light curve, we obtain spectroscopy to ensure that the star is young and that the transiting object can be sub‐stellar; then, we obtain Adaptive Optics infrared images and spectra, to exclude other bright eclipsing stars in the (larger) optical PSF; we carry out other observations as needed to rule out other false positive scenarios; finally, we also perform spectroscopy to determine the mass of the transiting companion. For planets with mass and radius determinations, we can calculate the mean density and probe the internal structure. We aim to constrain planet formation models and their time‐scales by discovering planets younger than ∼100 Myr and determining not only their orbital parameters, but also measuring their true masses and radii, which is possible so far only by the transit method. Here, we present an overview and first results (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
• Transit timing variation and activity in the WASP-10 planetary system★
  G. Maciejewski; D. Dimitrov; R. Neuhäuser; N. Tetzlaff; A. Niedzielski; St. Raetz; W. P. Chen; F. Walter; C. Marka; S. Baar; T. Krejcová; J. Budaj; V. Krushevska; K. Tachihara; H. Takahashi; M. Mugrauer
  Monthly Notices of the Royal Astronomical Society, 411, 2, 1204, 1212, Oxford University Press (OUP), 23 Nov. 2010
  Scientific journal

• Dec. 2020 - Present
  生体運動研究合同班会議
• Oct. 2020 - Present
  Japanese Society for Artificial Intelligence
• Nov. 2016 - Present
  The Astronomical Society of Japan
• Oct. 2013 - Present
  Physical Society of Japan