356 research outputs found
Shot2Story20K: A New Benchmark for Comprehensive Understanding of Multi-shot Videos
A short clip of video may contain progression of multiple events and an
interesting story line. A human need to capture both the event in every shot
and associate them together to understand the story behind it. In this work, we
present a new multi-shot video understanding benchmark Shot2Story20K with
detailed shot-level captions and comprehensive video summaries. To facilitate
better semantic understanding of videos, we provide captions for both visual
signals and human narrations. We design several distinct tasks including
single-shot video and narration captioning, multi-shot video summarization, and
video retrieval with shot descriptions. Preliminary experiments show some
challenges to generate a long and comprehensive video summary. Nevertheless,
the generated imperfect summaries can already significantly boost the
performance of existing video understanding tasks such as video
question-answering, promoting an under-explored setting of video understanding
with detailed summaries.Comment: See https://mingfei.info/shot2story for updates and more informatio
ΠΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΠΈ Π»Π΅ΠΆΠ°ΡΠΈΡ ΠΊΠ°ΠΏΠ΅Π»Ρ Π΄Π»Ρ Π·Π°Π΄Π°Ρ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ Π»Π°Π±ΠΎΡΠ°ΡΠΎΡΠ½ΠΎΠΉ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ
Π ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ, ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΌΠ΅ΡΠΎΠ΄Π° Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΆΠΈΠ΄ΠΊΠΈΡ
ΡΡΠ΅Π΄ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΠΈ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΠΏΡΠΎΠ± Π² Π²ΠΈΠ΄Π΅ Π»Π΅ΠΆΠ°ΡΠΈΡ
ΠΊΠ°ΠΏΠ΅Π»Ρ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΠΎΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠΎΠ² Π²Π»ΠΈΡΠ½ΠΈΡ ΠΏΡΠΎΡΠ΅ΠΊΠ°ΡΡΠΈΡ
Π² ΠΊΠ°ΠΏΠ΅Π»ΡΠ½ΡΡ
ΠΏΡΠΎΠ±Π°Ρ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² Π½Π° ΠΈΡ
ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π°ΠΏΡΠΎΠ±Π°ΡΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΠΈ ΠΊΠ°ΠΏΠ΅Π»Ρ Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΠΎΡΠ΅Π΄Π°Π½ΠΈΡ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΠΈ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ±ΡΠΈΠ½ΠΎΠ²ΠΎΠ³ΠΎ ΡΠ³ΡΡΡΠΊΠ° ΠΏΡΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ ΠΊΠ»ΠΎΡΡΠΈΠ½Π³ΠΎΠ²ΡΡ
ΡΠ΅ΡΡΠΎΠ²
A Joint Framework Towards Class-aware and Class-agnostic Alignment for Few-shot Segmentation
Few-shot segmentation (FSS) aims to segment objects of unseen classes given
only a few annotated support images. Most existing methods simply stitch query
features with independent support prototypes and segment the query image by
feeding the mixed features to a decoder. Although significant improvements have
been achieved, existing methods are still face class biases due to class
variants and background confusion. In this paper, we propose a joint framework
that combines more valuable class-aware and class-agnostic alignment guidance
to facilitate the segmentation. Specifically, we design a hybrid alignment
module which establishes multi-scale query-support correspondences to mine the
most relevant class-aware information for each query image from the
corresponding support features. In addition, we explore utilizing base-classes
knowledge to generate class-agnostic prior mask which makes a distinction
between real background and foreground by highlighting all object regions,
especially those of unseen classes. By jointly aggregating class-aware and
class-agnostic alignment guidance, better segmentation performances are
obtained on query images. Extensive experiments on PASCAL- and COCO-
datasets demonstrate that our proposed joint framework performs better,
especially on the 1-shot setting
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Quadruple bonding between iron and boron in the BFe(CO)3- complex.
While main group elements have four valence orbitals accessible for bonding, quadruple bonding to main group elements is extremely rare. Here we report that main group element boron is able to form quadruple bonding interactions with iron in the BFe(CO)3- anion complex, which has been revealed by quantum chemical investigation and identified by mass-selected infrared photodissociation spectroscopy in the gas phase. The complex is characterized to have a B-Fe(CO)3- structure of C3v symmetry and features a B-Fe bond distance that is much shorter than that expected for a triple bond. Various chemical bonding analyses indicate that the complex involves unprecedented Bβ£Fe quadruple bonding interactions. Besides the common one electron-sharing Ο bond and two FeβB dative Ο bonds, there is an additional weak BβFe dative Ο bonding interaction. This finding of the new quadruple bonding indicates that there might exist a wide range of boron-metal complexes that contain such high multiplicity of chemical bonds
Wind tunnel test study on the wind load variation law of a point focus solar furnace
This work studied the wind load acting on a point focus solar furnace composed of a 110Β m2 heliostat and a 77Β m2 concentrator through wind tunnel testing. Based on wind tunnel test data under 305 different working conditions, the variation laws of the wind pressure coefficient, power spectral density, and wind load coefficient of the heliostat and concentrator were analyzed. The results showed that due to the interaction between the concentrator and heliostat, the wind speed near the heliostat and concentrator decreased but the turbulence intensity increased, which caused the peak wind load coefficient to rise slightly. The results suggested that a safety factor of 1.1β1.2 should be considered for structural design and optimization of solar furnaces
Soliton generation in CaF crystalline whispering gallery mode resonators with negative thermal-optical effects
Calcium fluoride (CaF) crystalline whispering gallery mode resonators
(WGMRs) exhibit ultrahigh intrinsic quality factors and a low power anomalous
dispersion in the communication and mid-infrared bands, making them attractive
platforms for microresonator-based comb generation. However, their unique
negative thermo-optic effects pose challenges when achieving thermal
equilibrium. To our knowledge, our experiments serve as the first demonstration
of soliton microcombs in Q > 109 CaF WGMRs. We observed soliton
mode-locking and bidirectional switching of soliton numbers caused by the
negative thermo-optic effects. Additionally, various soliton formation dynamics
are shown, including breathing and vibrational solitons, which can be
attributed to thermo-photomechanical oscillations. Thus, our results enrich the
soliton generation platform and provide a reference for generating solitons
from WGMRs that comprise other materials with negative thermo-optic effects. In
the future, the ultrahigh quality factor of CaF crystal cavities may enable
the generation of sub-milliwatt-level broad-spectrum soliton combs.Comment: 4 pages,5 pictures,description of soliton generation in a calcium
fluoride whisper gallery mode microresonators with negative thermo-optical
effect,ready for publication in optics lette
Influencing factors on green supply chain resilience of agricultural products: an improved gray-DEMATEL-ISM approach
IntroductionNatural disasters and the COVID-19 epidemic have caused serious consequences such as long-term disruption and chain reaction to the global supply chain. Global warming caused by a large number of greenhouse gases has accelerated the attention of society to environmental sustainability. Therefore, identifying the transmission path of the factors that affect the green supply chain resilience of agricultural products is the primary task to accelerate the construction of a modern circulation system of agricultural products, ensure market supply and protect the environment.MethodsBased on the stakeholder theory, this study uses the literature research method to identify 15 factors that affect the green supply chain resilience of agricultural products. Through improving DEMATEL and ISM to study the internal relationship between the influencing factors, build a multi-level hierarchical structure model, and identify the basic transmission process and path of the influencing factors.ResultsThe results show that the governmentβs issuance of environmental policies and the provision of financial subsidies are important driving forces to strengthen the green supply chain resilience of agricultural products; The collaboration capability and business sustainability goals directly affect the green supply chain resilience of agricultural products; Agility, digital infrastructure construction, sustainability beliefs of top managers, public opinion with environment information disclosure and other factors indirectly affect the green supply chain resilience of agricultural products.DiscussionThe conclusion shows that the most important way to guide the green supply chain of agricultural products to develop towards standardization, normalization and sustainability is to guide the organization to set business sustainable goals and strengthen the collaborative cooperation ability of all stakeholders in the supply chain, with the government issuing environmental policies and providing financial subsidies as the driving factors. This study can provide theoretical basis for the government and enterprises to strengthen the green supply chain resilience of agricultural products
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