1,182 research outputs found
Probable Object Location (POLo) Score Estimation for Efficient Object Goal Navigation
To advance the field of autonomous robotics, particularly in object search
tasks within unexplored environments, we introduce a novel framework centered
around the Probable Object Location (POLo) score. Utilizing a 3D object
probability map, the POLo score allows the agent to make data-driven decisions
for efficient object search. We further enhance the framework's practicality by
introducing POLoNet, a neural network trained to approximate the
computationally intensive POLo score. Our approach addresses critical
limitations of both end-to-end reinforcement learning methods, which suffer
from memory decay over long-horizon tasks, and traditional map-based methods
that neglect visibility constraints. Our experiments, involving the first phase
of the OVMM 2023 challenge, demonstrate that an agent equipped with POLoNet
significantly outperforms a range of baseline methods, including end-to-end RL
techniques and prior map-based strategies. To provide a comprehensive
evaluation, we introduce new performance metrics that offer insights into the
efficiency and effectiveness of various agents in object goal navigation.Comment: Under revie
Learning Raw Image Denoising with Bayer Pattern Unification and Bayer Preserving Augmentation
In this paper, we present new data pre-processing and augmentation techniques
for DNN-based raw image denoising. Compared with traditional RGB image
denoising, performing this task on direct camera sensor readings presents new
challenges such as how to effectively handle various Bayer patterns from
different data sources, and subsequently how to perform valid data augmentation
with raw images. To address the first problem, we propose a Bayer pattern
unification (BayerUnify) method to unify different Bayer patterns. This allows
us to fully utilize a heterogeneous dataset to train a single denoising model
instead of training one model for each pattern. Furthermore, while it is
essential to augment the dataset to improve model generalization and
performance, we discovered that it is error-prone to modify raw images by
adapting augmentation methods designed for RGB images. Towards this end, we
present a Bayer preserving augmentation (BayerAug) method as an effective
approach for raw image augmentation. Combining these data processing technqiues
with a modified U-Net, our method achieves a PSNR of 52.11 and a SSIM of 0.9969
in NTIRE 2019 Real Image Denoising Challenge, demonstrating the
state-of-the-art performance. Our code is available at
https://github.com/Jiaming-Liu/BayerUnifyAug.Comment: Accepted by CVPRW 201
Schr\"{o}dinger-cat states in Landau-Zener-St\"{u}ckelberg-Majorana interferometry: a multiple Davydov Ansatz approach
Employing the time-dependent variational principle combined with the multiple
Davydov Ansatz, we investigate Landau-Zener (LZ) transitions in
a qubit coupled to a photon mode with various initial photon states at zero
temperature. Thanks to the multiple Davydov trial states, exact photonic
dynamics taking place in the course of the LZ transition is also studied
efficiently. With the qubit driven by a linear external field and the photon
mode initialized with Schr\"odinger-cat states, asymptotic behavior of the
transition probability beyond the rotating-wave approximation is uncovered for
a variety of initial states. Using a sinusoidal external driving field, we also
explore the photon-assisted dynamics of Landau-Zener-St\"{u}ckelberg-Majorana
interferometry. Transition pathways involving multiple energy levels are
unveiled by analyzing the photon dynamics.Comment: 25 pages, 11 figure
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