Proceedings of the 24th High Performance Computing Symposium (HPC 2016)

International audienc

Fast incremental bundle adjustment with covariance recovery

Efficient algorithms exist to obtain a sparse 3D representation of the environment. Bundle adjustment (BA) and structure from motion (SFM) are techniques used to estimate both the camera poses and the set of sparse points in the environment. Many applications require such reconstruction to be performed online, while acquiring the data, and produce an updated result every step. Furthermore, using active feedback about the quality of the reconstruction can help selecting the best views to increase the accuracy as well as to maintain a reasonable size of the collected data. This paper provides novel and efficient solutions to solving the associated NLS incrementally, and to compute not only the optimal solution, but also the associated uncertainty. The proposed technique highly increases the efficiency of the incremental BA solver for long camera trajectory applications, and provides extremely fast covariance recovery.This research was supported by the ARC through the “Australian Centre of Excellence for Robotic Vision” CE140100016 and by the Ministry of Education, Youth and Sports of the Czech Republic from the NPU II project IT4Innovations excellence in science (LQ1602), the TA-CR Competence Centres project V3C Visual Computing Competence Center (no. TE01020415) and research project no. VI20172020068

IMPART: big media data processing and analysis for film production

Comunicació presentada a la IEEE International Conference on Multimedia & Expo Workshops (ICMEW) celebrada a Torí (Itàlia) del 29 de juny al 3 de juliol de 2015.A typical high-end film production generates several terabytes of data per day, either as footage from multiple cameras or as background information regarding the set (laser scans, spherical captures, etc). The EU project IMPART (impart.upf.edu) has been researching solutions that improve the integration and understanding of the quality of the multiple data sources to support creative decisions onset or near it, and an enhanced post-production as well. The main results covered in this paper are: a public multisource production dataset made available for research purposes, monitoring and quality assurance of multicamera set-ups, multisource registration, anthropocentric visual analysis for semantic content annotation, acceleration of 3D reconstruction, and integrated 2D-3D web visualization tools.This work was supported by the European Commission, FP7 IMPART project (grant agreement No 316564)

IMPART: big media data processing and analysis for film production

Comunicació presentada a la IEEE International Conference on Multimedia & Expo Workshops (ICMEW) celebrada a Torí (Itàlia) del 29 de juny al 3 de juliol de 2015.A typical high-end film production generates several terabytes of data per day, either as footage from multiple cameras or as background information regarding the set (laser scans, spherical captures, etc). The EU project IMPART (impart.upf.edu) has been researching solutions that improve the integration and understanding of the quality of the multiple data sources to support creative decisions onset or near it, and an enhanced post-production as well. The main results covered in this paper are: a public multisource production dataset made available for research purposes, monitoring and quality assurance of multicamera set-ups, multisource registration, anthropocentric visual analysis for semantic content annotation, acceleration of 3D reconstruction, and integrated 2D-3D web visualization tools.This work was supported by the European Commission, FP7 IMPART project (grant agreement No 316564)

Search for the lightest chargino at root s=130 and 136 GeV

A search for pair production of the lightest chargino at root-s = 130.4 and 136.3 GeV has been carried out using the data sample corresponding to the 5.92 pb(-1) recorded by the DELPHI detector during the high energy run of LEP in the last period of 1995. The theoretical reference model has been the Minimal Supersymmetric Standard Model with R-parity conservation. The three topologies expected for the decay of a pair of charginos, namely two acoplanar leptons plus missing energy (ll), two jets and an isolated lepton plus missing (jjl) and missing energy in a hadronic environment (root-s), were investigated. No evidence of a signal was found. Lower mass limits were derived for various scenarios, including the case of a low mass difference between the chargino and the neutralino and of a light sneutrino. The mass limits range between 56.3 GeV/c(2) and the kinetic limit