Filters








90,665 Hits in 4.4 sec

Quantifying the Error of Light Transport Algorithms

A. Celarek, W. Jakob, M. Wimmer, J. Lehtinen
2019 Computer graphics forum (Print)  
The "Torus" scene is based on a scene by Cline et al. This project was partly supported by the Academy of Fin-  ...  The "Sponza" scene is courtesy of Marko Dabrovic. The "Bookshelf", "Kitchen", "Bottle" and "Bathroom" scenes have been ported to Mitsuba by Tiziano Portenier.  ...  Related Work A number of researchers have investigated the properties of error in light transport algorithms. Arvo et al.  ... 
doi:10.1111/cgf.13775 fatcat:n6xijmmprje2vb362pddk3jop4

Faster and more accurate transport procedures for HZETRN

T.C. Slaba, S.R. Blattnig, F.F. Badavi
2010 Journal of Computational Physics  
The authors would like to thank William Oberkampf for his guidance and helpful discussions.  ...  Society of Automotive Enginneers International Conference on Environmental Systems, 07ICES-92 (2007).  ...  Process description of the existing light particle transport algorithm.  ... 
doi:10.1016/j.jcp.2010.09.010 fatcat:uflkofy3anexhhpyep4bfiebtm

Quantitative photoacoustic microscopy of optical absorption coefficients from acoustic spectra in the optical diffusive regime

Zijian Guo
2012 Journal of Biomedical Optics  
With the acoustic spectral method, the absorption coefficients of an oxygenated bovine blood phantom at 560, 565, 570, and 575 nm were quantified with errors of <3%.  ...  We circumvent this requirement by quantifying the optical absorption coefficients from the acoustic spectra of PA signals acquired at multiple optical wavelengths.  ...  James Ballard for editing the manuscript. This work was sponsored in part by the National Institutes of Health grants R01 EB008085, R01 EB000712, R01 CA134539, R01 CA157277, and U54 CA 136398. L.  ... 
doi:10.1117/1.jbo.17.6.066011 pmid:22734767 pmcid:PMC3381032 fatcat:mltswb7nybaz7pebkoyeqqdjy4

A Multi-Agent Architecture for Quantified Fruits: Design and Experience

Jean-Pierre Briot, Nathalia Moraes Do Nascimento, Carlos José Pereira de Lucena
2016 Proceedings of the 28th International Conference on Software Engineering and Knowledge Engineering  
We discuss the rationales for the design of a Quantified Fruit multi-agent architecture for self-monitoring and self-prediction of the maturation of fruits.  ...  The concept of Quantified Self is about connected objects self-monitoring their human owner (e.g., a watch measuring heart rate, etc.).  ...  standard: 1) using backpropagation algorithm (to compute the gradients) [13] ; 2) combined with an algorithm to minimize the cost function (prediction error) -we have tried out batch gradient descent  ... 
doi:10.18293/seke2016-102 dblp:conf/seke/BriotNL16 fatcat:hylzrbvm2jc75d4yoprsjet6nq

Privacy-Preserving Indoor Localization via Active Scene Illumination

Jinyuan Zhao, Natalia Frumkin, Janusz Konrad, Prakash Ishwar
2018 2018 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)  
We quantify the impact of sensor noise and changes in ambient illumination on localization accuracy.  ...  To make the system robust to ambient lighting fluctuations, we modulate an array of LED light sources to actively control the illumination while recording the light received by the sensors.  ...  This needs to be quantified and is part of our future work.  ... 
doi:10.1109/cvprw.2018.00208 dblp:conf/cvpr/ZhaoFKI18 fatcat:xlw65y7ps5aipbung5hmwrcd5m

Estimating Road Traffic Congestion using Vehicle Velocity

W. Pattara-atikom, P. Pongpaibool, S. Thajchayapong
2006 2006 6th International Conference on ITS Telecommunications  
We quantify three levels of traffic congestion according to the wighted exponential moving averages of measured GPS speeds and also from human perceptions.  ...  The benefits of our proposed method over existing techniques is that it is simple, easy to understand, and compatible with existing traffic report system in Bangkok.  ...  The results show that the algorithm can estimate congestion event with error around half of a congestion level.  ... 
doi:10.1109/itst.2006.288722 fatcat:7yocunixxvfv3lhkgl7rgle2oa

Error Sources in the Analysis of Crowdsourced Spatial Tracking Data

Casper Van Gheluwe, Angel J. Lopez, Sidharta Gautama
2019 2019 IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops)  
To improve the reliability of reporting in such mobility studies, this paper systematically analyses the propagation of errors from low level operations to high level indicators, such as the modal split  ...  The propagation channels are presented schematically and a new approach to quantify the spatial data quality at the end of each processing stage is proposed.  ...  lights or in traffic jams.  ... 
doi:10.1109/percomw.2019.8730710 dblp:conf/percom/GheluweLG19 fatcat:h3jhnof3lfb4dhvjmam7sc5fti

Quantitative molecular bioluminescence tomography

Alexander Bentley, Xiangkun Xu, Zijian Deng, Jonathan E. Rowe, Ken Kang-Hsin Wang, Hamid Dehghani
2022 Journal of Biomedical Optics  
The proposed algorithm is able to recover the size and location of the bioluminescence source while accounting for tissue attenuation.  ...  An optimization algorithm is presented that localizes the spatial distribution of bioluminescence by simultaneously recovering the optical properties and location of bioluminescence source from the same  ...  The authors XX, ZD, and KKW would like to acknowledge the funding support from Xstrahl Ltd., National Cancer Institute, National Institutes of Health of USA (R21CA223403, R37CA230341, R01CA240811, and  ... 
doi:10.1117/1.jbo.27.6.066004 pmid:35726130 pmcid:PMC9207518 fatcat:ehrrj3klwjdlnp27fok2brfs2u

Dual-channel in-situ optical imaging system for quantifying lipid uptake and lymphatic pump function

Timothy Kassis
2012 Journal of Biomedical Optics  
Utilizing post-acquisition image processing algorithms, we can quantify correlations between vessel pump function, lymph flow, and lipid concentration of mesenteric lymphatic vessels in situ.  ...  Therefore, we sought to develop an in situ imaging system to quantify and correlate lymphatic function as it relates to lipid transport.  ...  Acknowledgments The authors are grateful for the various contributions by Dr.  ... 
doi:10.1117/1.jbo.17.8.086005 pmid:23224192 pmcid:PMC3413897 fatcat:dqouu4j2xfbinctn74rhapkck4

Analysis of Measurement Errors in Rail Vehicles' Pantograph Inspection System

Slawomir Judek, Leszek Jarzebowicz
2016 Elektronika ir Elektrotechnika  
Both peak and RMS errors have been quantified to evaluate accuracy of wear estimation and defect identification, respectively.  ...  1 Abstract-The paper presents an approach to evaluation of height measurement errors in laser scanning inspection system.  ...  In this paper we propose an approach to quantify errors of the CCS thickness measurement performed by the LSIS.  ... 
doi:10.5755/j01.eie.22.3.15309 fatcat:344gruxuovdxdpuvrqcg76wohy

Two-dimensional quantitative photoacoustic image reconstruction of absorption distributions in scattering media by use of a simple iterative method

Benjamin T. Cox, Simon R. Arridge, Kornel P. Köstli, Paul C. Beard
2006 Applied Optics  
The algorithm, which incorporates a diffusion-based finite-element model of light transport, converges quickly onto an accurate estimate of the distribution of absolute absorption coefficients.  ...  We describe a simple iterative algorithm to recover the distribution of optical absorption coefficients from the image of the absorbed optical energy.  ...  This work was supported by the Engineering and Physical Sciences Research Council (UK) and the Swiss National Science Foundation.  ... 
doi:10.1364/ao.45.001866 pmid:16572706 fatcat:k5dn267ctra5zg3mbzzh7aphzu

Intelligent Video Surveillance Technology in Intelligent Transportation

Fangcheng He, Wenqing Wu
2020 Journal of Advanced Transportation  
Through the study of intelligent video surveillance technology in intelligent traffic, the use of constrained least squares algorithm to remove motion blur and apply Kalan filtering to the sharpening process  ...  The research results show that this kind of intelligent video surveillance technology research in intelligent transportation can effectively increase the awareness of intelligent video surveillance technology  ...  and continuously and is less sensitive to the influence of noise, light, and weather factors. e processing speed of the algorithm is the realtime performance of the algorithm, as shown in Table 3 : It  ... 
doi:10.1155/2020/8891449 fatcat:7ezh7utqtbc67aqb7wqlgkujlq

Measurement of fracture aperture fields using transmitted light: An evaluation of measurement errors and their influence on simulations of flow and transport through a single fracture

Russell L. Detwiler, Scott E. Pringle, Robert J. Glass
1999 Water Resources Research  
Here we quantify aperture field measurement error and demonstrate the influence of this error on the results of flow and transport simulations (hypothesized experimental results) through saturated and  ...  These results emphasize the critical importance of defining and minimizing error for studies of flow and transport in single fractures.  ...  We next used a two-dimensional random-walk particle tracking algorithm to simulate solute transport through the saturated flow fields [e.g., are independent of the small differences in mean velocity, show  ... 
doi:10.1029/1999wr900164 fatcat:eka4xjjqfjgkpazqlwnkzqzwjm

Quantification of optical absorption coefficient from acoustic spectra in the optical diffusive regime using photoacoustic microscopy

Zijian Guo, Christopher Favazza, Lihong V. Wang, Alexander A. Oraevsky, Lihong V. Wang
2012 Photons Plus Ultrasound: Imaging and Sensing 2012  
With the acoustic spectral method, the absorption coefficients of an oxygenated bovine blood phantom at 560 and 575 nm were quantified with errors of <5%.  ...  However, accurate quantification in PAT requires knowledge of the optical fluence distribution, acoustic wave attenuation, and detection system bandwidth.  ...  James Ballard for editing the manuscript. This work was sponsored in part by National Institutes of Health grants R01 EB008085, R01 EB000712, R01 CA134539, R01 CA157277, and U54 CA 136398. L.  ... 
doi:10.1117/12.906787 fatcat:bxuiis4s2fdzdc65kthgsv4j2q

Estimation of Green House Gas and ContaminantEmissions from Traffic by microsimulation and refinedOrigin-Destination matrices: a methodological approach

Jorge E. Luzuriaga, Juan A. Moreno, Edgar Lorenzo-Saez, Santiago Mira Prats, Javier F. Urchueguia, Lenin G. Lemus, J.V. Oliver-Villanueva, Miguel A.Mateo Pla
2020 Zenodo  
The high levels of air contamination and presence of different pollutants are a largeproblem in most of the cities in which road transport is the primary source of emissions.The governments of more than  ...  Rather than abrute-force algorithm, we used a fast-convergence Lagrangian algorithm model which dealswith that vast quantities of information.  ...  Acknowledgments The authors would like to thank the Smart City Office of the Ajuntament de Valencia (www. smartcity.valencia.es), ETRA I+D (https://www.grupoetra.com/), and the financial support of the  ... 
doi:10.5281/zenodo.5176049 fatcat:smm2dxnp2rbjhpgmt7dxlmd6nm
« Previous Showing results 1 — 15 out of 90,665 results