Article
Optics
Haiyun Guo, Haowen Zhou, Partha P. Banerjee
Summary: In this paper, a simple non-interferometric incoherent light ray propagation model is introduced for three-dimensional profiling of transparent objects with typical thicknesses of the order of mm to cm. By analyzing the distorted captured image behind the object, the surface profile is simulated and optimized by monitoring the local change in the period of a two-dimensional cosine fringe.
Article
Engineering, Civil
Chang Hoon Lee, Seung Jae Lee, Moochul Shin
Summary: This study characterizes particle morphology using 2D digital image processing and explores the influence of image acquisition on resulting parameters. The research reveals that different projection angles can potentially mislead the interpretation of 2D particle morphology parameters. Additionally, a comparison is made between the 2D parameters and the true sphericity evaluated using 3D scanning technology. The findings demonstrate significant variances in 2D parameters and emphasize the importance of considering 3D particle morphology indices.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Chemistry, Multidisciplinary
Jing Zhang, Aimin Yan, Hongbo Zhang
Summary: This research proposes a novel method for encrypting 3D objects using invisible structured light. The system projects invisible light to reconstruct the objects in three dimensions. The encryption is done using stripe and fingerprint patterns with elliptic curve encryption algorithm, ensuring secure transmission of object information. The method effectively reduces background light interference and has practical applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Xueyan Huang, Yueyi Zhang, Zhiwei Xiong
Summary: This paper presents an event-based structured light system for high-speed 3D scanning, utilizing an event camera and a high-speed digital light projector. By triggering events with a blinking pseudo-random pattern generated by the projector, event frames are generated and digital image correlation is used to calculate displacements for deriving 3D surfaces of target objects.
Article
Physics, Applied
S. Klingel, A. Hein, E. Oesterschulze
Summary: This study presents a method to microscopically investigate the liquid-vapor interfaces on the bottom side of droplets placed on superhydrophobic structures. Using liquid droplets made of polydimethylsiloxane, the formation of these interfaces in the Cassie-Baxter state was accurately measured and observed with confocal microscopy. Test structures with varying geometries were used to understand the impact on the liquid-vapor interfaces, with a resolution of 10 nm required for detailed comparison with theoretical models.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Guijin Wang, Chenchen Feng, Xiaowei Hu, Hang Wang, Huazhong Yang
Summary: The study proposes a robust and practical SL illumination pattern coding method based on epipolar geometry, which effectively reduces coding redundancy in traditional SL patterns and improves the quality of 3D imaging.
IEEE SIGNAL PROCESSING LETTERS
(2021)
Article
Construction & Building Technology
Paulo H. F. Loz, Sergio C. Angulo, Markus S. Rebmann, Erol Tutumluer
Summary: This study utilized a 3D scanner to evaluate morphological properties of coarse aggregates, showing its accuracy in assessing surface area and volume. Compared to traditional methods, the 3D scanner proved to be faster and more precise.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Computer Science, Artificial Intelligence
Jianwen Song, Kai Liu, Arcot Sowmya, Changming Sun
Summary: This paper proposes a super-resolution phase retrieval network (SRPRNet) to address the issues of low accuracy and low resolution in single-pattern structured light 3D imaging. By introducing a phase-shifting module and a refinement and super-resolution module, multi-scale features can be extracted and refined and super-resolution phase components can be obtained, resulting in high-resolution absolute phase. Experimental results show that SRPRNet achieves state-of-the-art performance on 1x, 2x, and 4x super-resolution phase retrieval tasks.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2023)
Article
Optics
Liming Chen, Song Zhang
Summary: This paper proposes a method to drastically increase the depth of field (DOF) of microscopic 3D imaging by leveraging the focus stacking technique and developing a novel computational framework. Experimental results demonstrate that the proposed method can achieve a large DOF of approximately 2 mm and a field of view (FOV) of approximately 4 mm x 3 mm.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Ruiming Yu, Hongshan Yu, Xianqiang Liang, Wei Sun, Zirong Zeng, Naveed Akhtar
Summary: In this paper, a novel phase-domain modulated hybrid phase-shifting (PDM-HPS) structured light 3D measurement method is proposed, which solves the phase error of existing methods without additional pattern or space constraints. The method integrates phase-shifting speckle and phase-shifting fringe techniques to create a hybrid phase-shifting coding pattern and employs an efficient binary speckle-aided stereo phase matching process for unambiguous phase unwrapping. Experimental results demonstrate that the proposed method achieves comparable measurement accuracy to the multi-frequency (MF) method using only 1/3 projection patterns.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Multidisciplinary Sciences
Dolores Messer, Michelle S. Svendsen, Anders Galatius, Morten T. Olsen, Vedrana A. Dahl, Knut Conradsen, Anders B. Dahl
Summary: The study compared the measurement error and bias of using an open-source structured light scanner with a popular 3D digitizer arm and found similar precision between the two devices. The structured light scanner showed higher precision when handling less clearly defined landmarks and exhibited biased between-operator error.
Article
Optics
Jie Xu, Changjun Min, Yuquan Zhang, Jielei Ni, Gengwei Cao, Qianyi Wei, Jianjun Yang, Xiaocong Yuan
Summary: In this study, a wide-field single-probe structured light microscopy (SPSLM) is proposed and built to image the ultrafast three-dimensional topography evolution induced by femtosecond (fs) lasers. The SPSLM achieves high-resolution imaging in both spatial and temporal domains by utilizing a single imaging frame and a structured probe pulse. The technology is of great significance for studying ultrafast dynamics in fields such as fs laser ablation and material science.
PHOTONICS RESEARCH
(2022)
Article
Optics
Ramon Droop, Eileen Otte, Cornelia Denz
Summary: This research transfers the on-demand structuring of three-dimensional scalar light field patterns to polarization-structured vectorial light fields and its singularities. The customization of complex singularity formations embedded in three-dimensionally tailored vectorial field is experimentally realized through modulation of the light field's amplitude, phase, and polarization. The study shows that polarization singular networks can be customized to propagate robustly along curved trajectories, creating and annihilating during propagation.
Article
Optics
Zhiying Tan, Baolai Zhao, Yan Ji, Xiaobin Xu, Ziwei Kong, Tuo Liu, Minzhou Luo
Summary: This paper proposes a welding seam positioning method that combines polarization three-dimensional reconstruction and linear structured light imaging to solve current welding seam tracking problems. The method can calculate the polarization state and depth information of the welding area, enabling accurate positioning of the welding seam.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Wei Feng, Tong Qu, Junhui Gao, Henghui Wang, Xiuhua Li, Zhongsheng Zhai, Daxing Zhao
Summary: This paper proposes a novel method of structured light fields based on point cloud adaptive repair for 3D reconstruction of highly reflective surfaces. By designing and building a focused light field camera and deriving a subaperture image extraction algorithm based on image mosaic, the multidirectional image acquisition and 3D reconstruction are successfully achieved.
Article
Ecology
Karen M. Pedersen, Nico Bluthgen
Summary: In tropical forests, dung beetles play a crucial role as secondary seed dispersers, moving seeds to new locations and potentially increasing rates of seed survival and germination. Studies have shown that seeds covered with hairs on their surface are more likely to be buried by dung beetles, suggesting a selective pressure exerted by these dispersers on the phenotype of endozoochorous seeds.
Article
Ecology
Philipp O. Hoenle, David A. Donoso, Adriana Argoti, Michael Staab, Christoph von Beeren, Nico Bluethgen
Summary: Ant communities in the Ecuadorian Choco region exhibit high resistance and resilience during the recovery process. Ant species richness remains consistently high, while similarity to old-growth forests increases with regeneration age. Former cacao plantations recover at a faster rate than pastures, indicating a great recovery potential for this threatened biodiversity hotspot.
ECOLOGICAL APPLICATIONS
(2022)
Article
Ecology
Pascal Scherreiks, Martin M. Gossner, Manfred Ayasse, Nico Bluethgen, Markus Fischer, Valentin H. Klaus, Till Kleinebecker, Felix Neff, Daniel Prati, Sebastian Seibold, Nadja K. Simons, Wolfgang W. Weisser, Konstans Wells, Catrin Westphal, Jan Thiele, Didem Ambarli
Summary: This study analyzed the effects of present and historical landscape structure on plant and arthropod species richness in temperate grasslands. The results suggest that historical landscape structure is an important predictor of current species richness.
Article
Entomology
Marek Golian, Tanja Bien, Sebastian Schmelzle, Margy Alejandra Esparza-Mora, Dino Peter McMahon, Klaus Dreisewerd, Jan Buellesbach
Summary: The traditional GC-MS method does not provide enough information about the range of CHC profiles in insects, whereas the Ag-LDI-MS method can detect longer chain CHCs. Additionally, considering the body surface area of insects allows for a more accurate evaluation of relative CHC quantities.
Article
Ecology
Lara Becker, Nico Bluethgen, Barbara Drossel
Summary: This study examines the assembly of species interaction networks and the influence of demographic noise on species and strategy diversity. The findings suggest that assembled communities show maximum species diversity and average generalization at intermediate assembly stages.
AMERICAN NATURALIST
(2022)
Article
Ecology
Karoline Ceron, Diogo B. Provete, Mathias M. Pires, Andrea C. Araujo, Nico Bluthgen, Diego J. Santana
Summary: This study investigates the spatiotemporal variation in predator-prey interaction networks formed by anurans and arthropods, revealing that network dissimilarity between ecoregions and seasons is primarily driven by interaction rewiring, and species turnover is positively related to geographic distance. Prey availability plays a crucial role in determining the variation in network structure between seasons and among areas.
Article
Ecology
Michael Staab, Rafael Achury, Christian Ammer, Martin Ehbrecht, Veronika Irmscher, Hendrik Mohr, Peter Schall, Wolfgang W. Weisser, Nico Bluethgen
Summary: Gap creation and deadwood provisioning in forests negatively impact dung removal, suggesting that there is no complementarity effect between dung beetle species related to biodiversity-ecosystem functioning relationships.
JOURNAL OF ANIMAL ECOLOGY
(2022)
Article
Ecology
Sergio Timoteo, Jorg Albrecht, Beatriz Rumeu, Ana C. Norte, Anna Traveset, Carol M. Frost, Elizabete Marchante, Francisco A. Lopez-Nunez, Guadalupe Peralta, Jane Memmott, Jens M. Olesen, Jose M. Costa, Luis P. da Silva, Luisa G. Carvalheiro, Marta Correia, Michael Staab, Nico Bluthgen, Nina Farwig, Sandra Hervias-Parejo, Sergei Mironov, Susana Rodriguez-Echeverria, Ruben Heleno
Summary: Keystone species play a disproportionately important role in ecosystem functioning. This study examines whether their importance extends across different types of interactions and ecological niche dimensions. The results show that keystone species importance is positively associated across multiple niche dimensions and is independent of abundance. This has important implications for ecosystem resilience and conservation.
FUNCTIONAL ECOLOGY
(2023)
Article
Ecology
Gaetane Le Provost, Noelle Schenk, Caterina Penone, Jan Thiele, Catrin Westphal, Eric Allan, Manfred Ayasse, Nico Bluthgen, Runa S. Boeddinghaus, Andrea Larissa Boesing, Ralph Bolliger, Verena Busch, Markus Fischer, Martin M. Gossner, Norbert Hoelzel, Kirsten Jung, Ellen Kandeler, Valentin H. Klaus, Till Kleinebecker, Sophia Leimer, Sven Marhan, Kathryn Morris, Sandra Mueller, Felix Neff, Margot Neyret, Yvonne Oelmann, David J. Perovic, Sophie Peter, Daniel Prati, Matthias C. Rillig, Hugo Saiz, Deborah Schaefer, Michael Scherer-Lorenzen, Michael Schloter, Ingo Schoening, Marion Schrumpf, Juliane Steckel, Ingolf Steffan-Dewenter, Marco Tschapka, Juliane Vogt, Christiane Weiner, Wolfgang Weisser, Konstans Wells, Michael Werner, Wolfgang Wilcke, Peter Manning
Summary: This study examines the impact of biodiversity on the supply of ecosystem services in European agricultural grasslands. The results show that plant diversity at both plot-level and surrounding areas plays a significant role in the provision of cultural and aboveground regulating services. In contrast, provisioning and belowground regulating services are more influenced by field-level management and abiotic factors. The findings also highlight the positive influence of biodiversity on different stakeholder groups.
NATURE ECOLOGY & EVOLUTION
(2023)
Article
Ecology
Philipp O. Hoenle, Michael Staab, David A. Donoso, Adriana Argoti, Nico Bluethgen
Summary: Microhabitat differentiation, such as vertical stratification, contributes to species coexistence and biodiversity in tropical forests. However, the extent of stratification during forest recovery and its influence on community reassembly remain poorly understood.
JOURNAL OF ANIMAL ECOLOGY
(2023)
Article
Ecology
Rafael Achury, Michael Staab, Nico Bluethgen, Wolfgang W. Weisser
Summary: Forest canopy gaps play a crucial role in the forest ecology, as they facilitate rapid plant reproduction and growth and promote the colonization of animals. However, the impact of gaps on insect communities has been understudied, and the source of insects colonizing gaps remains poorly understood. Through a forest experiment, it was found that the creation of gaps led to a significant change in the true bug community structure, with an increase in species mainly recruited from open lands. Additionally, the study revealed that the species colonizing experimental gaps had larger body size and a preference for open vegetation.
Article
Ecology
Timo Metz, Nico Bluethgen, Barbara Drossel
Summary: Understanding ecosystem recovery after disturbance is vital for conservation. Mutualistic networks between plants and their animal partners play a crucial role in ecosystem functioning. Our study shows that non-obligate mutualists facilitate network assembly in the early stages, while obligate and specialist mutualists dominate at the end. This highlights the occurrence of shifts towards more specialized animals during ecosystem recovery.
Article
Biology
Michael Staab, Martin M. Gossner, Nadja K. Simons, Rafael Achury, Didem Ambarli, Soyeon Bae, Peter Schall, Wolfgang W. Weisser, Nico Bluethgen
Summary: Species richness and biomass of insects has generally declined in German forests over the past decade, with larger and carnivorous species being more vulnerable. The underlying drivers of insect decline and variations between species are not yet fully understood. This study highlights the importance of forests in understanding insect trends and suggests that non-native tree species and extensive timber harvesting may contribute to declines. Furthermore, it found that larger and more abundant species at higher trophic levels are most affected, while herbivores show an increase in population. The findings indicate potential shifts in food webs and emphasize the need for targeted management to mitigate declines.
COMMUNICATIONS BIOLOGY
(2023)
Article
Biology
Wolfgang Weisser, Nico Bluethgen, Michael Staab, Rafael Achury, Joerg Mueller
Summary: In response to reports of significant insect declines, there has been an increase in the gathering and analysis of insect time series data. However, there is still disagreement regarding the reasons behind these declines. To address this issue, it is necessary to conduct experiments in addition to quantitative analysis of existing data, in order to determine the most important drivers of decline. A coordinated effort among researchers is needed to rank these drivers and generate the knowledge necessary for effective conservation action.
Article
Biology
Nico Bluethgen, Michael Staab, Rafael Achury, Wolfgang W. Weisser
Summary: Temporal trends in insect numbers vary across studies and habitats, but drivers are poorly understood, while there is substantial quantitative evidence for drivers of spatial variation. Increased consideration of spatial evidence in studying the causes of insect decline is proposed.