25 research outputs found
Embodied Scene-aware Human Pose Estimation
We propose embodied scene-aware human pose estimation where we estimate 3D
poses based on a simulated agent's proprioception and scene awareness, along
with external third-person observations. Unlike prior methods that often resort
to multistage optimization, non-causal inference, and complex contact modeling
to estimate human pose and human scene interactions, our method is one stage,
causal, and recovers global 3D human poses in a simulated environment. Since 2D
third-person observations are coupled with the camera pose, we propose to
disentangle the camera pose and use a multi-step projection gradient defined in
the global coordinate frame as the movement cue for our embodied agent.
Leveraging a physics simulation and prescanned scenes (e.g., 3D mesh), we
simulate our agent in everyday environments (libraries, offices, bedrooms,
etc.) and equip our agent with environmental sensors to intelligently navigate
and interact with scene geometries. Our method also relies only on 2D keypoints
and can be trained on synthetic datasets derived from popular human motion
databases. To evaluate, we use the popular H36M and PROX datasets and, for the
first time, achieve a success rate of 96.7% on the challenging PROX dataset
without ever using PROX motion sequences for training.Comment: Project website: https://embodiedscene.github.io/embodiedpose/
Zhengyi Luo and Shun Iwase contributed equall
Activation detector measurements at the hadron absorber of the NuMI neutrino beamline at Fermilab
Two-dimensional distributions of the production rates of radionuclides in aluminum and gold activation detectors, placed behind the hadron absorber of the NuMI beamline at Fermilab were obtained in an experiment for shielding data as a dump in a proton-beam-energy domain above 100 GeV. The production rates of 7 Be, 22 Na, and 24 Na in the aluminum activation detectors and those of 185 Os, 194 Au, and 196 Au in the gold activation detectors were obtained from the γ-ray spectra of HPGe counters. It was concluded that in these distributions showed some peaks that can be attributed to a lack of shielding caused by the gaps for arraignment and cooling in the hadron absorber. The radionuclides in the activation detectors were mainly produced by neutrons, protons and pions, according to analyses of calculated results by the PHITS code