Filters








30,913 Hits in 5.8 sec

Single-photon computational 3D imaging at 45 km [article]

Zheng-Ping Li, Xin Huang, Yuan Cao, Bin Wang, Yu-Huai Li, Weijie Jin, Chao Yu, Jun Zhang, Qiang Zhang, Cheng-Zhi Peng, Feihu Xu, Jian-Wei Pan
2019 arXiv   pre-print
Using this technique, we experimentally demonstrated active single-photon 3D-imaging at a distance of up to 45 km in an urban environment, with a low return-signal level of ∼1 photon per pixel.  ...  Long-range active imaging has a variety of applications in remote sensing and target recognition.  ...  Acknowledgments This work was supported by National Key R&D Program of China (SQ2018YFB050100), National Natural Science Foundation of China, the Chinese Academy of Science, the Thousand Young Talent Program  ... 
arXiv:1904.10341v1 fatcat:xasrlgbpa5e2jlxirmdi4tfopi

Studying The Role Of 3D Computer Simulation In Generating Photorealistic Images

Hassan Karbalai Rezakhani, Ahmad Alasti
2015 Zenodo  
The objective of this research was to study and analyze photorealistic computer-generated images and bring 3D Computer Graphics into Photography realm. 2-1-2 Cinema and Zuse's Machine 2-1-4 Baudrillard  ...  This paper presents part of a interdisciplinary research work done for master degree at the Faculty of Visual Arts and Design of the University of Tehran.  ...  In the case of analog films, the linear sequence of the images is maintained. In other words, the frames can be displayed sequentially over time.  ... 
doi:10.5281/zenodo.1287529 fatcat:uua6ilroq5eyhewxz327qeb2ce

3D imaging with time of flight cameras

Shahram Izadi, Ayush Bhandari, Achuta Kadambi, Ramesh Raskar
2014 ACM SIGGRAPH 2014 Courses on - SIGGRAPH '14  
Figure 1 : This course offers a self-contained tutorial to building, understanding, and exploiting Time of Flight 3D sensors.  ...  We will begin the course by introducing attendees to the landscape of 3D cameras (upper-left) that can obtain depth maps of a scene (upper-right).  ...  Abstract Time-of-flight (ToF) cameras provide access to depth/3D information of a scene. They find applications in imaging, computer vision and computer graphics.  ... 
doi:10.1145/2614028.2615433 dblp:conf/siggraph/IzadiBKR14 fatcat:2dfvcb6kqjexvf4c4f7a73kyyq

Trends in medical imaging: from 2D to 3D

Georgios Sakas
2002 Computers & graphics  
In this article, we review some aspects of this tendency on applications from CT, MRI/MRA, angiography, 3D ultrasound, cancer treatment, simulation and training, and VR/AR in navigation.  ...  In recent years, three important new developments have dominated the world of medical imaging: "better diagnosis alone" is not desired by end users if there is no impact on the therapy procedure; interventional  ...  Fig. 3 . 3 Variation of transparency in real time during the evaluation of an MRA image.  ... 
doi:10.1016/s0097-8493(02)00103-6 fatcat:zgneaeibnrgrhpwzcmi7hmm2m4

Computer Vision for 3D Perception and Applications

Matteo Poggi, Thomas B. Moeslund
2021 Sensors  
Effective 3D perception of an observed scene greatly enriches the knowledge about the surrounding environment and is crucial to effectively develop high-level applications for various purposes [...]  ...  Conflicts of Interest: The authors declare no conflict of interest.  ...  and the editors and assistants of Sensors for their kind help and support.  ... 
doi:10.3390/s21123944 fatcat:4izmrcykunegddzd74xneyxzti

3D Reconstruction from Multiple Images Part 1: Principles

Theo Moons
2008 Foundations and Trends in Computer Graphics and Vision  
More recently, 3D cameras have entered the market, that use the same kind of time-of-flight principle, but that acquire an entire 3D image at the same time.  ...  Time-of-Flight The basic principle of time-of-flight sensors is the measurement of the duration before a sent out time-modulated signal -usually light from a laser -returns to the sensor.  ... 
doi:10.1561/0600000007 fatcat:ciqxweveefa6xhlq6q4jk6cnl4

Photon-Efficient Computational 3D and Reflectivity Imaging with Single-Photon Detectors [article]

Dongeek Shin, Ahmed Kirmani, Vivek K Goyal, Jeffrey H. Shapiro
2014 arXiv   pre-print
Our computational imager combines physically accurate single-photon counting statistics with exploitation of the spatial correlations present in real-world reflectivity and 3D structure.  ...  Experiments conducted in the presence of strong background light demonstrate that our computational imager is able to accurately recover scene depth and reflectivity, while traditional maximum-likelihood  ...  Furthermore, future advances in optoelectronic methods can improve the accuracy of our 3D and reflectivity imager.  ... 
arXiv:1406.1761v1 fatcat:bpmkhydqebaptipp2qauk7chkq

Vostok: 3D scanner simulation for industrial robot environments

Alessandro Rossi, Marco Barbiero, Ruggero Carli
2020 ELCVIA Electronic Letters on Computer Vision and Image Analysis  
Introduction Due to recent technology improvements, we are now getting close to a next era of robots in which they will do multiple tasks, and computer vision will play a huge role in that.  ...  To meet these requirements, new tools are needed to analyse the project in advance, highlighting peculiarities and complexities.  ...  Our aim was to create a useful simulator for the design of automated cells. In this field the acquisition time of a 3D image is very low.  ... 
doi:10.5565/rev/elcvia.1244 fatcat:f4fjfcifoja7ncinzgxfe2vuou

Hybrid computed tomography and magnetic resonance imaging 3D printed models for neurosurgery planning

Teodoro Martín-Noguerol, Félix Paulano-Godino, Roy F. Riascos, Juan Calabia-del-Campo, Javier Márquez-Rivas, Antonio Luna
2019 Annals of Translational Medicine  
sources allowing generating hybrid computed tomography (CT) and magnetic resonance imaging (MRI) 3D printed models.  ...  In the last decade, the clinical applications of three-dimensional (3D) printed models, in the neurosurgery field among others, have expanded widely based on several technical improvements in 3D printers  ...  Recent advances in imaging segmentation and post-processing software are allowing the generation of 3D virtual and printable models in a more accurate manner (3) .  ... 
doi:10.21037/atm.2019.10.109 pmid:31930085 pmcid:PMC6944557 fatcat:iu23fqyxwfadhixevsr6vyonqu

Optical techniques for 3D surface reconstruction in computer-assisted laparoscopic surgery

L. Maier-Hein, P. Mountney, A. Bartoli, H. Elhawary, D. Elson, A. Groch, A. Kolb, M. Rodrigues, J. Sorger, S. Speidel, D. Stoyanov
2013 Medical Image Analysis  
With the recent paradigm shift of surgical practice towards MIS and new developments in 3D optical imaging, this is a timely discussion about technologies that could facilitate complex CAS procedures in  ...  In minimally invasive surgery (MIS), optical techniques are an increasingly attractive approach for in vivo 3D reconstruction of the soft-tissue surface geometry.  ...  Acknowledgements The authors would like to acknowledge the Royal Academy of Engineering/EPSRC Research Fellowship and the German Research Foundation (DFG, PD 15577 and Research Training Group 1126) for  ... 
doi:10.1016/j.media.2013.04.003 pmid:23837969 fatcat:44gqmq6ms5f2ril4xrn574eljq

3D Hand Pose Detection in Egocentric RGB-D Images [chapter]

Grégory Rogez, Maryam Khademi, J. S. Supančič III, J. M. M. Montiel, Deva Ramanan
2015 Lecture Notes in Computer Science  
Despite the recent advances in full-body pose estimation using Kinect-like sensors, reliable monocular hand pose estimation in RGB-D images is still an unsolved problem.  ...  We evaluate our approach on a real-world annotated dataset and propose a novel annotation technique for accurate 3D hand labelling even in case of partial occlusions.  ...  RGB and Time-of-Flight (ToF) cameras have also been combined for real-time 3D hand gesture interaction [3] or near-realtime detailed hand pose estimation [29] .  ... 
doi:10.1007/978-3-319-16178-5_25 fatcat:wloilrcfxrbfbeitmjfr74hna4

Real Time Hand Based Robot Control Using 2D/3D Images [chapter]

Seyed Eghbal Ghobadi, Omar Edmond Loepprich, Farid Ahmadov, Jens Bernshausen, Klaus Hartmann, Otmar Loffeld
2008 Lecture Notes in Computer Science  
This paper presents a new solution using 2D/3D images for real time hand detection, tracking and classification which is used as an interface for sending the commands to an industrial robot. 2D/3D images  ...  Haar-like features are then extracted from the segmented color image and used as the input features for an AdaBoost classifier to find the region of the hand in the image and track it in each frame.  ...  system using Time-of-Flight (TOF) technique is used.  ... 
doi:10.1007/978-3-540-89646-3_30 fatcat:kgecrfmzivdezbzxz6nyv6cdpi

Computer Vision-Based Health Monitoring of Mecklenburg Bridge Using 3D Digital Image Correlation [article]

Mehrdad S. Dizaji, Devin K. Harris, Bernie Kassner, Jeffrey C. Hill
2020 arXiv   pre-print
The investigation focused on collecting full-field three-dimensional digital image correlation (3D-DIC) deformation measurements during the dropping sequence (removal of jacking to support beam on bearing  ...  The research team aided the Virginia Department of Transportation - Richmond District in the characterization of the bridge behavior of one of the bridge beams that had been repaired due to a previous  ...  Regardless of the system type, each is able to generate threedimensional point cloud representations of the measured surface via time-of-flight measurements or geometric reconstruction approaches.  ... 
arXiv:2005.02120v1 fatcat:ewvi3oqzu5ayjb72frttsi6cui

Deformable Surface 3D Reconstruction from Monocular Images

Mathieu Salzmann, Pascal Fua
2010 Synthesis Lectures on Computer Vision  
In this survey, we will review the two main classes of techniques that have proved most effective so far: The template-based methods that rely on establishing correspondences with a reference image in  ...  Being able to recover the shape of 3D deformable surfaces from a single video stream would make it possible to field reconstruction systems that run on widely available hardware without requiring specialized  ...  Acknowledgments Parts of the authors' work described in this book was supported by grants from the Swiss National Science Foundation.  ... 
doi:10.2200/s00319ed1v01y201012cov003 fatcat:r4s4vpjptvfjtgj3bpgrvav2xq

Active optical 3D imaging for heritage applications

G. Godin, J.-A. Beraldin, J. Taylor, L. Cournoyer, M. Rioux, S. El-Hakim, R. Baribeau, F. Blais, P. Boulanger, J. Domey, M. Picard
2002 IEEE Computer Graphics and Applications  
models of the 15-meter bronze Great Buddha in Kamakura. 4 Another recent project 5 focused on Internet-transmittable 3D digital models of some architectural elements of the Roman Coliseum.  ...  A high-resolution 3D model contains a wealth of information available for analysis.  ...  Special thanks to George MacDonald, former director of the Canadian Museum of Civilization, for his constant support and encouragement from the inception of the 3D imaging project.  ... 
doi:10.1109/mcg.2002.1028724 fatcat:pqou763nrzgzzeifquyborikfu
« Previous Showing results 1 — 15 out of 30,913 results