Automatic Creation of Virtual Artefacts from Video Sequences

2005 ◽  
Author(s):  
Andrew W. Fitzgibbon ◽  
Geoff Cross ◽  
Andrew Zisserman
Keyword(s):  
Focal Length ◽  
3D Models ◽  
Video Sequences ◽  
Digital Representation ◽  
The Third ◽  
3D Presentation ◽  
Object Features ◽  
The Given ◽  
System Geometry ◽  
2D Images

Digital representation of an artefact is necessary in order to measure, admire and analyse such ancient pieces. For the purpose of storing, recoding and transmitting information, digital photographs may be enough. However, in the examination purposes of an artefact, a 3D presentation is invaluable as it allows the object viewpoint to be modified freely and 3D measurements to be taken on object features. This chapter describes the system by which 3D models from photographs can be acquired, without the need for the calibration of system geometry such as the camera focal length, relative motion of the camera and object, and the relative positions of the camera and object. This system instead computes the representation of all possible objects and camera configurations which are consistent with the given image. The first section discusses how tracking points observed in 2D images allows for the computation of the relative camera and object geometry. The second section discusses the construction of a triangulated 3D model from the object projections. The third section discusses the refinement of the model based on surface texture.

Automatic generation of bas-relief on 3D models based on 2D images for rhinoceros

2018 ◽  
Vol 23 (6) ◽  
pp. 99-113
Author(s):  
Sha LIU ◽  
Feng YANG ◽  
Shunxi WANG ◽  
Yu CHEN
Keyword(s):  
3D Models ◽  
Automatic Generation ◽  
2D Images

Automatic Parametric Modeling From Non-Feature Based Designs for Additive Manufacturing

2021 ◽  
Author(s):  
Xinyi Xiao ◽  
Byeong-Min Roh
Keyword(s):  
Additive Manufacturing ◽  
3D Models ◽  
Parametric Modeling ◽  
Parametric Models ◽  
Performance Simulation ◽  
Cad Modeling ◽  
3D Cad ◽  
Feature Based ◽  
And Performance ◽  
The Given

Abstract The integration of Topology optimization (TO) and Generative Design (GD) with additive manufacturing (AM) is becoming advent methods to lightweight parts while maintaining performance under the same loading conditions. However, these models from TO or GD are not in a form that they can be easily edited in a 3D CAD modeling system. These geometries are generally in a form with no surface/plane information, thus having non-editable features. Direct fabricate these non-feature-based designs and their inherent characteristics would lead to non-desired part qualities in terms of shape, GD&T, and mechanical properties. Current commercial software always requires a significant amount of manual work by experienced CAD users to generate a feature-based CAD model from non-feature-based designs for AM and performance simulation. This paper presents fully automated shaping algorithms for building parametric feature-based 3D models from non-feature-based designs for AM. Starting from automatically decomposing the given geometry into “formable” volumes, which is defined as a sweeping feature in the CAD modeling system, each decomposed volume will be described with 2D profiles and sweeping directions for modeling. The Boolean of modeled components will be the final parametric shape. The volumetric difference between the final parametric form and the original geometry is also provided to prove the effectiveness and efficiency of this automatic shaping methodology. Besides, the performance of the parametric models is being simulated to testify the functionality.

Structure-from-Motion, Capturing Geological Samples v1

2021 ◽  
Author(s):  
Madalyn Massey
Keyword(s):  
United States ◽  
Structure From Motion ◽  
3D Models ◽  
Geological Survey ◽  
United States Geological Survey ◽  
Geological Samples ◽  
Motion Capturing ◽  
2D Images

Structure-from-Motion (SfM) is a photogrammetry process that creates 3D models from overlapping 2D images. This protocol focuses on its application related to geological and geophysical samples. The samples includes fossil, hand samples and rocks. This is a recommended practice to be used later for the publication on United States Geological Survey website.

Telemetry-Based Depth Recovery for Virtual Factory Construction and Extension to Remote Facility Management

1999 ◽  
Author(s):  
Dan Zetu ◽  
Pat Banerjee ◽  
Ali Akgunduz
Keyword(s):  
3D Models ◽  
Human Motion ◽  
Facility Management ◽  
Virtual Manufacturing ◽  
Shop Floor ◽  
Virtual Factory ◽  
Depth Recovery ◽  
Camera Location ◽  
Virtual Manufacturing Environment ◽  
2D Images

Abstract The fast construction of a Virtual Factory model without using a CAD package can be made possible by using computer vision techniques. In order to create a realistic Virtual Manufacturing environment, especially when such a model has to be created in correlation to an existing facility, a reliable algorithm that extracts 3D models from camera images is needed, and this requires exact knowledge of the camera location when capturing images. In this paper, we describe an approach for depth recovery from 2D images based on tracking a camera within the environment. We also explore the extension of our telemetry-based algorithm to remote facility management, by tracking and synchronizing human motion on the shop floor with motion of an avatar in a Virtual Environment representing the same shop floor.

scholarly journals Otomasi Trigger dengan Penentuan Sudut dalam Foto Panorama Berbasis Arduino Uno

2015 ◽  
Vol 5 (2) ◽  
pp. 123
Author(s):  
Nur Ikhwan Sholihin ◽  
Danang Lelono
Keyword(s):  
Focal Length ◽  
Automatic Device ◽  
Error Rates ◽  
System Testing ◽  
Landscape Photography ◽  
Shift Analysis ◽  
Testing Tool ◽  
Arduino Uno ◽  
The Given ◽  
Blank Spot

AbstrakDalam pemotretan panorama diperlukan alat bantuyang dapat menentukan besar pergeseran arah kamera secara konsisten agar diperoleh foto-foto yang pas tanpa ada bagian yang hilang karena tidak terfoto. Dengan didapatnya foto yang saling tersambung maka dapat dilakukan penggabungan foto untuk menjadi sebuah foto panorama. Penggabungan foto-foto hasil pemotretan dapat dilakukan dengan cara image stiching (menjahit), yaitu menyambung foto-foto hasil pemotretan dari satu titik tetap.Alat yang dirancang merupakan alat yang otomatis menentukan besar sudut perputaran head kamera dengan input jumlah pergeseran dan akan melakukan pemotretan (triggering) bila sudut sudah sesuai dengan input. Pengujian sistem meliputi pengujian variasi jumlah pergeseran menggunakan satu nilai focal length dengan memvariasikan nilai pan dan tilt. Pengujian ketelitian konsistensi pergeseran dan arah kamera. Pengujian besar perpotongan setiap pergeseran dengan menggabungkan 2 foto yang sejajar kemudian dicari seberapa besar irisan yang dihasilkan.Berdasarkan pengujian menggunakan kamera DSLR diperoleh hasil alat dapat bekerja dengan baik secara otomatis berdasarkan nilai input pan dan tilt serta dapat melakukan triggering. Pergeseran efisien diperoleh pada nilai pan sebanyak 9 kali dan tilt 4 kali menggunakan lensa dengan focal length 18 mm. Hasil analisa tingkat kesalahan pergeseran bernilai kurang dari 3% yang menjadikan alat ini stabil dan konsisten dalam pergerakannya. Kata kunci—foto panorama, Arduino Uno, otomasi, fotografi  AbstractIn landscape photography, some supporting devices are needed to assign how much the camera’s shifting consistently is. It is needed to get good photos without any blank spot photos. The linked photos could be rendered to be a landscape photo using a photography software. It is could be done by image stiching, a way to stich photos taken from one constant taking point.  The device is an automatic device which could assign how much the rotation degree of the camera’s head with given input, how much the shift is. It will take a shot if the rotation degree is appropriate with the given input. The system testing by variying the shift value of camera using one focal length value. The accuration test of the consistency of camera’s shift and camera’s direction. The error value could be determined by joining two parallel photo.According to the testing, tool can work automatically and also trigering can do well. Efficient shift in the number of photos and good results using the pan 9 times and tilt 4 times. The results of the error rates shift analysis have value less than 3% and that makes the tool quite stable and consistent in its movements. Keywords— panoramic photo, arduino uno, automation ,photography. 

scholarly journals CULTURAL HERITAGE MONUMENT DOCUMENTATION THROUGH ADAPTIVE PARAMETRIC DESIGN PROCESS

2021 ◽  
Vol XLVI-M-1-2021 ◽  
pp. 769-776
Author(s):  
G. Tryfonos ◽  
M. Ioannides ◽  
A. G. Anastasi ◽  
V. A. Apostolou ◽  
P. P. Pieri ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Parametric Design ◽  
3D Models ◽  
Building Information Modelling ◽  
3D Data ◽  
Time Period ◽  
Building Information ◽  
Game Developers ◽  
The Given ◽  
The City

Abstract. The paper presents a novel adaptive parametric documentation, modelling and sharing methodology, which aims to achieve a continuous holistic documentation, data processing and sharing process for cultural heritage community, such as architects, engineers, archaeologists, conservators, programmers, fabricators, contest creators, game developers, scholars and common citizens. Thus, the use of advance parametric and building information modelling software allows the processing and specification of all data by creating the 3D models needed for the multidisciplinary experts. Two Cypriot case studies from the medieval time period have been chosen for the development, and evaluation of our proposed methodology in order to investigate the process of modelling and sharing all the given metadata and 3D data. The first one is the Asinou Church, a UNESCO Heritage stone monument in the Troodos Mountains with a unique interior and the Kolossi Castle, a former Crusader stronghold on the west of the city of Limassol on the island of Cyprus.

Concept-less Schemata: The Reciprocity of Imagination and Understanding in Kant’s Aesthetics

2021 ◽  
Vol 26 (4) ◽  
pp. 511-529
Author(s):  
Luigi Filieri
Keyword(s):  
Empirical Concept ◽  
The Third ◽  
The Aesthetic ◽  
The Given

AbstractIn this paper, I discuss Kant’s concept-less schematism (KU, 5: 287) in the third Critique1 and make three claims: 1) concept-less schematism is entirely consistent with the schematism in the first Critique; 2) concept-less schematism is schematism with no empirical concept as an outcome; and 3) in accordance with 1) and 2), the imagination is free to synthesize the given manifold and leads to judgements of taste without this meaning either that the categories play no role at all or that these judgements are full-fledged cognitive determining judgements. While most commentators read the freedom of the imagination as its independence from the understanding, I argue that the freedom of the imagination is based on a non-determining employment of the pure concepts of the understanding. The freedom of the aesthetic imagination consists in the temporal schematization of the categories without any complementary determination of the empirical concept.

scholarly journals Optimal Coordination of Last Trains for Maximum Transfer Accessibility with Heterogeneous Walking Time

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yao Chen ◽  
Baohua Mao ◽  
Yun Bai ◽  
Tin Kin Ho ◽  
Zhujun Li
Keyword(s):  
Dwell Time ◽  
Random Variable ◽  
Minimal Extension ◽  
The Third ◽  
Train Timetable ◽  
Urban Rail ◽  
Optimal Coordination ◽  
Transfer Stations ◽  
The Given ◽  
Walking Time

Last train coordination aims to synchronize the arrival and departure times of the last feeder trains and the last connecting trains at transfer stations to improve the transfer accessibility of urban rail networks. This study focuses on the transfer accessibility between last trains with considering heterogeneous transfer walking time. Three mathematical models are developed on the last train timetable optimization. The first model fine-tunes the last train timetable under the given bound of the dwell time. The second one aims to allow the mutual transfers with the prolonged dwell time to maximize the transfer accessibility. A biobjective function is proposed to seek the trade-off between the maximal transfer accessibility and the minimal extension of dwell time. The third model considers the heterogeneity of transfer walking time that is represented as a random variable following a probability distribution. A discrete approximation method is proposed to reformulate the nonlinear model. The embedded Branch & Cut algorithm of CPLEX is applied to solve the models. A real case on the Shenzhen metro network is conducted to demonstrate the performance of the models. The three models all provide better last train timetable than the current timetable in practice. The sensitivity analysis manifests that the third model are always advantageous in the optimization of successful transfer passengers.

Classification of Left Atrial Appendage Morphology Using Deep Learning

2020 ◽  
Author(s):  
Mikayle A. Holm ◽  
Alex Deakyne ◽  
Erik Gaasedelen ◽  
Weston Upchurch ◽  
Paul A. Iaizzo
Keyword(s):  
Left Atrial ◽  
Left Atrial Appendage ◽  
Blood Clot ◽  
3D Models ◽  
Atrial Appendage ◽  
Blood Clots ◽  
Mri Scans ◽  
2D Images ◽  
Trained Network

Abstract Atrial fibrillation, a common cardiac arrhythmia, can lead to blood clots in the left atrial appendage (LAA) of the heart, increasing the risk of stroke. Understanding the LAA morphology can indicate the likelihood of a blood clot. Therefore, a classification convolutional neural network was implemented to predict the LAA morphology. Using 2D images of 3D models created from MRI scans of fixed human hearts and a pre-trained network, an 8.7% error rate was achieved. The network can be improved with more data or expanded to classify the LAA from the automatically segmented DICOM datasets and measure the LAA ostia.

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