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3d photography

Chiara Villa
An accurate and precise documentation of injuries is fundamental in a forensic pathological context. Photographs and manual measurements are taken of all injuries during autopsies, but ordinary photography projects a 3D wound on a 2D space. Using technologies such as photogrammetry, it is possible to create 3D detailed, to-scale, true-color documentation of skin injuries from 2D pictures. A comparison between the measurements of 165 lesions taken during autopsies and on photogrammetrically processed pictures was performed...
December 2, 2016: International Journal of Legal Medicine
Masahiro Yamaguchi
A perfect three-dimensional (3D) display that satisfies all depth cues in human vision is possible if a light field can be reproduced exactly as it appeared when it emerged from a real object. The light field can be generated based on either light ray or wavefront reconstruction, with the latter known as holography. This paper first provides an overview of the advances of ray-based and wavefront-based 3D display technologies, including integral photography and holography, and the integration of those technologies with digital information systems...
December 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Jason M Weissler, Carrie S Stern, Jillian Schreiber, Bardia Amirlak, Oren M Tepper
Throughout history, the technological advancements of conventional clinical photography in plastic surgery have refined not only the plastic surgeon's armamentarium, but have invigorated the profession through technology. The technology of the once traditional two-dimensional photograph has since been revolutionized and refashioned to incorporate novel applications, which have since become the standard in clinical photography.Contrary to traditional standardized two-dimensional photographs, three-dimensional photography provides the surgeon with an invaluable volumetric and morphological analysis by demonstrating true surface dimensions both pre and postoperatively...
November 21, 2016: Plastic and Reconstructive Surgery
Martin Fink, Ursula Hirschfelder, Veronika Hirschinger, Matthias Schmid, Caroline Spitzl, Andreas Detterbeck, Elisabeth Hofmann
OBJECTIVES: The purpose of this study was to compare two-dimensional (2D) lateral photographs versus three-dimensional (3D) face scans in analyzing facial profiles using Schwarz's concept of the jaw profile field (JPF) in its original 2D and in a modified 3D version. In addition, the distribution of the facial profile types described by Schwarz were examined. MATERIALS AND METHODS: Of 75 adult volunteers recruited specifically for this study, we obtained both photographs (Nikon D 300S; Nikon, Düsseldorf, Germany) and scans (FaceSCAN(3D) Scientific Photolab 60 Hz; 3D-Shape, Erlangen, Germany) in a standardized setting...
November 3, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Tae-Rin Kwon, Eun Ja Choi, Chang Taek Oh, Dong-Ho Bak, Song-I Im, Eun Jung Ko, Hyuck Ki Hong, Yeon Shik Choi, Joon Seok, Sun Young Choi, Gun Young Ahn, Beom Joon Kim
BACKGROUND AND OBJECTIVES: Many studies have investigated the application of micro-insulated needles with radio frequency (RF) to treat acne in humans; however, the use of a micro-insulated needle RF applicator has not yet been studied in an animal model. The purpose of this study was to evaluate the effectiveness of a micro-insulated needle RF applicator in a rabbit ear acne (REA) model. STUDY DESIGN/MATERIALS AND METHODS: In this study, we investigated the effect of selectively destroying the sebaceous glands using a micro-insulated needle RF applicator on the formation of comedones induced by application of 50% oleic acid and intradermal injection of P...
September 29, 2016: Lasers in Surgery and Medicine
Dean Vafiadis, Gary Goldstein, David Garber, Anthony Lambrakos, Bj Kowalski
OBJECTIVE: Preserving soft and hard tissues after extraction and implant placement is crucial for anterior esthetics. This technique will show how the information gathered from a cone-beam computed tomography (CBCT) scan of the maxillary left central incisor and an intra-oral digital impression can be merged to fabricate a CAD/CAM crown-root matrix to be used as an immediate provisional restoration that mimics the natural anatomy. CLINICAL CONSIDERATIONS: Due to trauma, a left central incisor appeared to be fractured and was scheduled for extraction and implant placement...
September 27, 2016: Journal of Esthetic and Restorative Dentistry
Davood Khodadad, Alok Kumar Singh, Giancarlo Pedrini, Mikael Sjödahl
The objective of this paper is to describe a full-field deformation measurement method based on 3D speckle displacements. The deformation is evaluated from the slope of the speckle displacement function that connects the different reconstruction planes. For our experiment, a symmetrical arrangement with four illuminations parallel to the planes (x,z) and (y,z) was used. Four sets of speckle patterns were sequentially recorded by illuminating an object from the four directions, respectively. A single camera is used to record the holograms before and after deformations...
September 20, 2016: Applied Optics
Elwira Hołowko, Kamil Januszkiewicz, Paweł Bolewicki, Robert Sitnik, Jakub Michoński
In forensic documentation with bloodstain pattern analysis (BPA) it is highly desirable to obtain non-invasively overall documentation of a crime scene, but also register in high resolution single evidence objects, like bloodstains. In this study, we propose a hierarchical 3D scanning platform designed according to the top-down approach known from the traditional forensic photography. The overall 3D model of a scene is obtained via integration of laser scans registered from different positions. Some parts of a scene being particularly interesting are documented using midrange scanner, and the smallest details are added in the highest resolution as close-up scans...
October 2016: Forensic Science International
Adam Kostelnik, Alexander Cegan, Miroslav Pohanka
The use of a cell phone as a detection system is easy, simple and does not require trained personnel, which is in contrast to standard laboratory instruments. This paper deals with immobilization of acetylcholinesterase (AChE) in a gelatin matrix, and phenol red, as an indicator of AChE activity, is used in order to establish a method that is easily compatible with a camera device. AChE splits acetylcholine into choline and acetic acid, which changes the pH of a medium, resulting in a phenol red color change...
September 7, 2016: Sensors
Elise M Hall, Brian S Thurow, Daniel R Guildenbecher
Digital in-line holography (DIH) and plenoptic photography are two techniques for single-shot, volumetric measurement of 3D particle fields. Here we present a comparison of the two methods by applying plenoptic imaging to experimental configurations that have been previously investigated with DIH. These experiments include the tracking of secondary droplets from the impact of a water drop on a thin film of water and tracking of pellets from a shotgun. Both plenoptic imaging and DIH successfully quantify the 3D nature of these particle fields...
August 10, 2016: Applied Optics
David Brang, Zhongtian Dai, Weili Zheng, Vernon L Towle
BACKGROUND: The accurate localization of implanted ECoG electrodes over the brain is of critical importance to invasive diagnostic work-up for the surgical treatment of intractable epileptic seizures. The implantation of subdural electrodes is an invasive procedure which typically introduces non-uniform deformations of a subject's brain, increasing the difficulty of determining the precise location of the electrodes vis-à-vis cortex. Formalization of this problem is used to define a novel solution for the optimal localization of subdural electrodes...
November 1, 2016: Journal of Neuroscience Methods
Yuta Itoh, Toshiyuki Amano, Daisuke Iwai, Gudrun Klinker
We propose a method to calibrate viewpoint-dependent, channel-wise image blur of near-eye displays, especially of Optical See-Through Head-Mounted Displays (OST-HMDs). Imperfections in HMD optics cause channel-wise image shift and blur that degrade the image quality of the display at a user's viewpoint. If we can estimate such characteristics perfectly, we could mitigate the effect by applying correction techniques from the computational photography in computer vision as analogous to cameras. Unfortunately, directly applying existing calibration techniques of cameras to OST-HMDs is not a straightforward task...
November 2016: IEEE Transactions on Visualization and Computer Graphics
Yu Zhang, Poching Teng, Yo Shimizu, Fumiki Hosoi, Kenji Omasa
For plant breeding and growth monitoring, accurate measurements of plant structure parameters are very crucial. We have, therefore, developed a high efficiency Multi-Camera Photography (MCP) system combining Multi-View Stereovision (MVS) with the Structure from Motion (SfM) algorithm. In this paper, we measured six variables of nursery paprika plants and investigated the accuracy of 3D models reconstructed from photos taken by four lens types at four different positions. The results demonstrated that error between the estimated and measured values was small, and the root-mean-square errors (RMSE) for leaf width/length and stem height/diameter were 1...
2016: Sensors
Timothée Jacquesson, Patrick Mertens, Moncef Berhouma, Emmanuel Jouanneau, Emile Simon
Skull base architecture is tough to understand because of its 3D complex shape and its numerous foramen, reliefs or joints. It is especially true for the sphenoid bone whom central location hinged with most of skull base components is unique. Recently, technological progress has led to develop new pedagogical tools. This way, we bought a new real-time three-dimensional insight of the sphenoid bone that could be useful for the teacher, the student and the surgeon. High-definition photography was taken all around an isolated dry skull base bone prepared with Beauchêne's technique...
June 2, 2016: Surgical and Radiologic Anatomy: SRA
Jean-Marc Levaillant, Romain Nicot, Laurence Benouaiche, Gérard Couly, Daniel Rotten
The ultrasonographic surface rendered oro-palatal (SROP) view is a 3D reconstructed view of the fetal perioral region, which combines ultrasound insonation in a trans oral, upward directed axial direction and the surface rendered mode. It allows the simultaneous visualization on a single scan of the superior lip, alveolar ridge and secondary palate. It corresponds prenatally to the submental intra oral photography of the palate of neonates. The aim of the study was to demonstrate the benefice of using the SROP view in the management of cleft lip with or without cleft palate, uni- or bi-lateral, diagnosed prenatally (22-28 gestational weeks)...
July 2016: Journal of Cranio-maxillo-facial Surgery
Sarah A Robertson, Roy M Kimble, Kristen J Storey, Emma L Gee Kee, Kellie A Stockton
BACKGROUND: Infantile haemangiomas are common lesions of infancy. With the development of novel treatments utilised to accelerate their regression, there is a need for a method of assessing these lesions over time. Volume is an ideal assessment method because of its quantifiable nature. This study investigated whether 3D photography is a valid tool for measuring the volume of infantile haemangiomas over time. METHOD: Thirteen children with infantile haemangiomas presenting to the Vascular Anomalies Clinic, Royal Children's Hospital/Lady Cilento Children's Hospital treated with propranolol were included in the study...
September 2016: Journal of Pediatric Surgery
K C Koban, T Schenck, P M Metz, E Volkmer, F Haertnagl, V Titze, R E Giunta
BACKGROUND: There has been ongoing development in the field of 3-dimensional (3-D) Surface Imaging by laser scanner and digital 3-D photography (Photogrammetry) in recent years. Manufacturers tend to make new 3-D cameras compact, light-weighted, mobile, and user-friendly, similar to the development on the smartphone market. Although 3D scans have been used for patient consultations and digital documentation in Plastic Surgery since the 1980, there has been no significant development lately regarding its use for objective assistance during surgery...
April 2016: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
Yona Harmelin, Dominique Boineau, Nathalie Cardot-Leccia, Eric Fontas, Philippe Bahadoran, Anne-Lise Becker, Henri Montaudié, Emeline Castela, Christophe Perrin, Jean-Philippe Lacour, Thierry Passeron
BACKGROUND AND OBJECTIVE: Very few treatments for striae are based on prospective randomized trials. The objective of this study was to assess the efficacy of bipolar fractional radiofrequency and bipolar radiofrequency potentiated with infrared light, alone or combined, for treating abdominal stretch marks. STUDY DESIGN/MATERIALS AND METHODS: Bicentric prospective interventional randomized controlled trial in the department of Dermatology of University Hospital of Nice and Aesthetics Laser Center of Bordeaux, France...
March 2016: Lasers in Surgery and Medicine
M M de Sainte Croix, D Gauld, A H Forgie, R Lowe
INTRODUCTION: Human bite marks are often sustained during sexual, domestic or child abuse. Currently, analysis of these marks involves digital photography techniques along with an expert forensic odontologist opinion. Photographs often focus closely on the bite mark and give little context to the anatomical location of the injury. Due to variation in camera models and expertise of the photographer, photograph quality can affect its interpretation. Additionally, it can sometimes be days between injury and examination, allowing the injury pattern and colour to alter, making it harder to analyse...
May 2016: Journal of Forensic and Legal Medicine
Hong-qiang Ye, Yu-shu Liu, Yun-song Liu, Jing Ning, Yi-jiao Zhao, Yong-sheng Zhou
OBJECTIVE: To explore a method of constructing universal 3-dimensional (3D) colorized digital dental model which can be displayed and edited in common 3D software (such as Geomagic series), in order to improve the visual effect of digital dental model in 3D software. METHODS: The morphological data of teeth and gingivae were obtained by intra-oral scanning system (3Shape TRIOS), constructing 3D digital dental models. The 3D digital dental models were exported as STL files...
February 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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