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Depth Based View Synthesis Using Graph Cuts for 3DTV

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Journal of Signal and Information Processing 2013年第3期4卷 327-335页

作者： anh Tu tran Koichi Harada Graduate School of Engineering Hiroshima University Higashihiroshima Japan.

In three-dimensional television (3DTV), an interactive free viewpoint selection application has received more attention so far. This paper presents a novel method that synthesizes a free-viewpoint based on multiple textures and depth maps in multi-view camera configuration. This method solves the cracks and holes problem due to sampling rate by performing an inverse warping to retrieve texture images. This step allows a simple and accurate re-sampling of synthetic pixels. To enforce the spatial consistency of color and remove the pixels wrapped incorrectly because of inaccuracy depth maps, we propose some processing steps. The warped depth and warped texture images are used to classify pixels as stable, unstable and disoccluded pixels. The stable pixels are used to create an initial new view by weighted interpolation. To refine the new view, Graph cuts are used to select the best candidates for each unstable pixel. Finally, the remaining disoccluded regions are filled by our inpainting method based on depth information and texture neighboring pixel values. Our experiment on several multi-view data sets is encouraging in both subjective and objective results. Furthermore, our proposal can flexibly use more than two views in multi-view system to create a new view with higher quality.

关键词： View Synthesis Depth Image Based Rendering (DIBR) Free-Viewpoint TV Graph Cuts

Depth-Aided Tracking Multiple Objects under Occlusion

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Journal of Signal and Information Processing 2013年第3期4卷 299-307页

作者： anh Tu tran Koichi Harada Graduate School of Engineering Hiroshima University Higashihiroshima Japan.

In this paper, we have presented a novel tracking method aiming at detecting objects and maintaining their la-bel/identification over the time. The key factors of this method are to use depth information and different strategies to track objects under various occlusion scenarios. The foreground objects are detected and refined by background subtraction and shadow cancellation. The occlusion detection is based on information of foreground blobs in successive frames. The occlusion regions are projected to the projection plane XZ to analysis occlusion situation. According to the occlusion analysis results, different objects’ corresponding strategies are introduced to track objects under various occlusion scenarios including tracking occluded objects in similar depth layer and in different depth layers. The experimental results show that our proposed method can track the moving objects under the most typical and challenging occlusion scenarios.

关键词： Visual Tracking Multiple Object Tracking Stereo Tracking Occlusion Analysis

Role of Aedes aegypti and Aedes albopictus during the 2011 dengue fever epidemics in Hanoi, Vietnam

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Asian Pacific Journal of Tropical Medicine 2015年第7期8卷 541-546页

作者： Pham Thi Kim Lien Vu Trong Duoc Laurent Gavotte Emmanuel Cornillot Phan Thi Nga Laurence Briant Roger Frutos tran Nhu duong National Institute of Hygiene and Epidemiology CPBS UMR 5236 CNRS-UM1-UM2 1919 route de Mende 34293 Montpellier Cedex 5France ISEM UMR 5554 CNRS-UM2-IRD Université Montpellier 2 CC065 Place E. Bataillon34095 Montpellier Cedex 5 France CPBS UMR 5236 CNRS-UM1-UM2 1919 route de Mende 34293 Montpellier Cedex 5France Intertryp UMR 17 Cirad-IRD Campus International de Baillarguet34398 Montpellier Cedex 5 France

Objective: To record the human cases of dengue fever(DF) and investigate the Aedes mosquito species circulating during the Hanoi 2011 DF epidemics. Methods: 24 different outbreak points were recorded in 8 districts between August and December 2011. Results: 140 patients were hospitalized following dengue diagnostic with a predominance of males(59.3%) and the 15-34 age class. Only DENV-1(11.27%) and DENV-2(88.73%) serotypes were detected in human samples. Mosquito sampling performed in and around patients households revealed the predominance of Aedes aegypti(95.15%) versus Aedes albopictus(4.85%). There is a positive correlation between the population density of Aedes aegypti and the number of human cases and duration of outbreaks. Conclusions: This was not observed for Aedes albopictus. 3 pools of Aedes aegypti were positive with dengue virus, two with DENV-1 and one with DENV-2.

关键词： Aedes aegypti Aedes albopictus Dengue Vector density

Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

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Journal of Forestry Research 2020年第5期31卷 1713-1722页

作者： tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai Thanh Hai Vu Thanh Nam Trieu Thai Hung Hoang Van Thang tran Duc Manh Cao Chi Khiem Vu Tien Lam Nguyen Quang Hung tran Hoang Quy Pham Quang Tuyen Trinh Ngoc Bon Nguyen Thi Thu Phuong Ninh Viet Khuong Nguyen Van Tuan Dang Thi Hai Ha tran Hai Long Dang Van Thuyet Dang Thinh Trieu Nguyen Van Thinh tran anh Hai duong Quang Trung Nguyen Van Bich Dinh Hai Dang Pham Tien Dung Nguyen Huy Hoang Le Thi Hanh Phan Minh Quang Nguyen Thi Thuy Huong Hoang Thanh Son Nguyen Thanh Son Nguyen Thi Van anh Nguyen Thi Hoai anh Pham Dinh Sam Hoang Thi Nhung Hoang Van Thanh Nguyen Huu Thinh tran Hong Van Ho Trung Luong Bui Kieu Hung Research Institute for Sustainable Humanosphere Kyoto UniversityUjiKyotoJapan Silviculture Research Institute Vietnamese Academy of Forest SciencesNorth Tu LiemHanoiVietnam Center for Southeast Asian Studies Kyoto UniversityKyotoJapan Vietnamese Academy of Forest Sciences North Tu LiemHanoiVietnam Vietnam Administration of Forestry No.2 Ngoc HaBa DinhHanoiVietnam

Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest *** study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was *** results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of *** area and AGB are positively correlated with trees>30 cm *** areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-*** percent of the areas surveyed had stand densities of 300–600 ***^-1,and 64%had basal areas of 20–40 m^2 ha^-*** is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in *** causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density.

关键词： Aboveground biomass Carbon storage Climatic variables Ecoregion Edaphic variables Oldgrowth forest

EP Aquarii:A New Picture of the Circumstellar Envelope

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Research in Astronomy and Astrophysics 2024年第3期24卷 83-105页

作者： Pham T.Nhung Do T.Hoai Pierre Darriulat Pham Tuan-anh Pham N.Diep Nguyen B.Ngoc tran T.Thai Department of Astrophysics Vietnam National Space CenterVietnam Academy of Science and Technology18Hoang Quoc VietNghia DoCau GiayHa Noivietnam

New analyses of earlier ALMA observations of oxygen-rich AGB star EP Aquarii are presented,which complete a previously published analysis and offer a different interpretation of the morpho-kinematics of the circumstellar *** birth of the equatorial density enhancement(EDE)is shown to occur very close to the star where evidence for rotation has been *** to the star and where outflows have been observed:their interaction with the gas of the nascent EDE is seen to play an important role in the development of the wind and the evolution of its radial velocity from 8 to 10 km s^(-1) on the polar symmetry axis to~2 km s^(-1) at the *** implies complex morpho-kinematics:making reliable interpretations with reasonable confidence is *** particular,it questions an earlier interpretation implying the presence of a white dwarf companion orbiting the star at an angular distance of -0″4 from its *** proposes instead an interpretation in terms of a standard mass ejection associated with a shock wave leaving a void of emission in its *** Doppler velocity wings are seen to consist of two components,the upper velocity end of the global wind,reaching above±12 km s^(-1),and an effective line broadening,confined within 200 mas from the center of the star,reaching above±20 km s^(-1) and interpreted as caused by the pattern of shock waves resulting from the interaction between stellar pulsation and convective cell partition.

关键词： stars AGB and post-AGB-(stars) circumstellar matter-radio lines stars

A comparative analysis of weight-based machine learning methods for landslide susceptibility mapping in Ha Giang area

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Big Earth Data 2023年第4期7卷 1005-1034页

作者： Thanh Trinh Binh Thanh Luu trang Ha Thi Le duong Huy Nguyen Trong Van tran Thi Hai Van Nguyen Khanh Quoc Nguyen Lien Thi Nguyen Faculty of Computer Science Phenikaa UniversityYen NghiaHa DongHanoi 12116Vietnam Phenikaa Research and Technology Institute(PRATI) A&A Green Phoenix Group JSCNo.167 Hoang NganTrung HoaCau GiayHanoi 11313Vietnam Northwestern Geological Division General Department of Geology and Minerals of VietnamHanoiVietnam Youth union office Thuyloi University175 Tay SonDong DaHanoiVietnam Center of Remote Sensing and Geohazards Vietnam Institute of Geosciences and Mineral ResourcesHanoiVietnam

Landslide susceptibility maps (LSMs) are very crucial for planningpolicies in hazardous areas. However, the accuracy and reliability ofLSMs depend on available data and the selection of suitable *** study is conducted to produce LSMs by combinations of machinelearning methods and weighting techniques for Ha Giang province,Vietnam, where has limited data. In study area, we gather 11 landslideconditioning factors and establish a landslide inventory *** the weights of classes (or factors) is very important toprepare data for machine learning methods to generate LSMs. Wefrst use frequency ratio (FR) and analytic hierarchy process (AHP)techniques to generate the weights. Then, random forest (RF), supportvector machine (SVM), logistic regression (LR), and AHP methods arecombined with FR and AHP weights to yield accurate and reliableLSMs. Finally, the performance of these methods is evaluated by fivestatistical metrics, ROC and R-index. The empirical results have shownthat RF is the best method in terms of R-index and the five metrics, *** rate (0.9661), FP rate (0.0), ACC (0.9835), MAE (0.0046), and RMSE(0.0350) for this study area. This study opens the perspective of weightbasedmachine learning methods for landslide susceptibility mapping.

关键词： Landslide logistic regression random forest SvM Vietnam

An improved CRNN for Vietnamese Identity Card Information Recognition

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Computer Systems Science & Engineering 2022年第2期40卷 539-555页

作者： Trinh Tan Dat Le tran anh Dang Nguyen Nhat Truong Pham Cung Le Thien Vu Vu Ngoc Thanh Sang Pham Thi Vuong Pham The Bao Information Science Faculty Sai Gon UniversityHCM City700000Vietnam Faculty of Electrical&Electronics Engineering University of TechnologyHCM City700000Vietnam

This paper proposes an enhancement of an automatic text recognition system for extracting information from the front side of the Vietnamese citizen identity(CID)***,we apply Mask-RCNN to segment and align the CID card from the ***,we present two approaches to detect the CID card’s text lines using traditional image processing techniques compared to the EAST ***,we introduce a new end-to-end Convolutional Recurrent Neural Network(CRNN)model based on a combination of Connectionist Temporal Classification(CTC)and attention mechanism for Vietnamese text recognition by jointly train the CTC and attention objective functions *** length of the CTC’s output label sequence is applied to the attention-based decoder prediction to make the final label *** process helps to decrease irregular alignments and speed up the label sequence estimation during training and inference,instead of only relying on a data-driven attention-based encoder-decoder to estimate the label sequence in long *** may directly learn the proposed model from a sequence of words without detailed *** evaluate the proposed system using a real collected Vietnamese CID card dataset and find that our method provides a 4.28%in WER and outperforms the common techniques.

关键词： Vietnamese text recognition OCR CRNN BLSTM attention mechanism joint CTC-Attention

Infographics Use and Changes in Television Programs in Vietnam

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Infographics Use and Changes in Television Programs in Vietn...

作者： tran THUY duong 中国科学技术大学

学位级别：硕士

信息技术的普及和飞速发展给我们的生活带来了巨大的改变,这种改变也体现在新闻和通讯领域。将技术应用置于新闻活动之中,是目前最流行的一种趋势,这种趋势也越来越趋向于借用与发挥信息图表的优势。1982年“信息图表”诞生,它最先见诸... 详细信息

信息技术的普及和飞速发展给我们的生活带来了巨大的改变,这种改变也体现在新闻和通讯领域。将技术应用置于新闻活动之中,是目前最流行的一种趋势,这种趋势也越来越趋向于借用与发挥信息图表的优势。1982年“信息图表”诞生,它最先见诸于爱德毕·塔夫特撰写的《定量信息的视觉显示》一书中。自此,信息图表成为多媒体不可缺少的技术工具。这种戏剧性的发展,主要来源于观众需要在很短的时间内掌握全面的消息。信息图表不仅适用于传统媒体,如报纸或蓬勃发展的在线互联网,还为除了使用文本和记录场景的电视提供了巨大便利。信息图表已在世界多个著名的电视频道有了长足发展,如：彭博社,CNN,BBC,NBC,NHK等。然而,对于包括越南的许多发展中国家来说,它仍然是一个全新的用于改变广播叙事形式的新技术。因此,将信息图表应用到越南的广播节目很可能具有市场。为什么它没有受到那么多关注,信息图表成为新闻记者的首要挑战又是什么?本文特别涉及到那些利用编辑业务信息图表作为故事的越南电视节目,尤其是国家电视台(VTV)专业渠道的新形式的真实情况：娱乐和体育新闻频道(VTV3);科学教育频道(VTV2);政治新闻频道(VTV1);越南国家,有线电视,健康通道(VCTV10);金融业务渠道(VITV),越南河内和图形中央。本文重点关注这些主题：什么样的信息图表会被使用,什么样的电视节目使用信息图表的视觉效果最好,以及记者自身为使用信息图标需要适应哪些信息工具。此外,本文还研究了全体广播工作人员为了达到同时精通写作与创造可视化成果,成为“富媒体型技术工人”的努力,以及他们与图形设计者的和谐沟通工作方式。论文还讨论了新闻生产的改变,即信息图表打破了传统的内容和图形部门之间需要衔接的主要障碍。它挖掘出技术的应用,任务分配精确的困难,劳作分配,管理制度以及对视觉新闻制作团队员工之间的文化因素。它已经被那些具有一定理由和一定要求,愿意为多技能记者的培训付出高成本的新闻机构所采用。为了产生全面的结果,本文在研究方法上采用了问卷调查和深度访谈相结合的方法,此外,本文还附加了一些额外的问题。根据测量结果,一些解决方案和有效的建议提出应将可视化新闻生产纳入越南电视频道的一体化进程之中。它们包括基于一系列的职业技能活动方式的技术途径,任务分配以及从事信息图表生产操作的管理程序,即解决方案：信息图表推广,管理体系,人力资源求职,培训课程等,工作环境布置,在线TV与社会网络整合后续研究可以增加量化技术途径,用量化的方法评估大量涉及生产信息图表和集成活动的电视频道。研究还可以在分析上做一些提升,如开展和提供关于类型和视觉的电视节目在使用信息图表有效性方面的级别深度评估。为了部分地实现信息图表在电视节目中的普及,在不久的将来,一个研制课题“一个为儿童设计的信息图表型电视娱乐节目”将在不久后实现。我们设计该节目的目的为了给孩子提供一个不那么严肃的、有利于孩子学习和玩耍的舒适环境。该系统在后台中采用了Motessori教育,这种教育被认为是早期儿童教育中最科学的文件。

关键词：信息图表数据可视化信息图表使用新闻的改变制作新闻教育方法

Anti-inflammatory effects of alkaloid enriched extract from roots of Eurycoma longifolia Jack

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Asian Pacific Journal of Tropical Biomedicine 2019年第1期9卷 18-23页

作者： Dao Thi Thanh Hien tran Phi Long tran Phuong Thao Jeong-Hyung Lee duong Thu trang Nguyen Thi Thu Minh Pham Van Cuong Do Thi Ngoc Lan Nguyen Hai Dang Nguyen Tien Dat Deparment of Traditional Pharmacy Hanoi University of Pharmacy Department of Biochemistry College of Natural Sciences Kangwon National University Advanced Center for Bio-organic Chemistry Institute of Marine Biochemistry Vietnam Academy of Science and Technology National Institute of Drug Quality Control Center for Research and Technology transfers

Objective: To examine the in vitro and in vivo anti-inflammatory effects of the alkaloid enriched extract(ELA) from the roots of Eurycoma longifolia. Methods: The in vitro antiinflammatory effects of ELA were evaluated by examining its inhibitory activities against nitric oxide(NO) production and inducible nitric oxide synthase(iN OS) and cyclooxygenase2(COX-2) expressions in lipopolysaccharide(LPS)-stimulated RAW264.7 cells. The level of NO produced in the culture media was determined by Griess method. The i NOS and COX-2 protein expressions were analyzed by Western blot. The in vivo effect of ELA was evaluated on LPS-induced septic shock in mice model. Mice mortality was monitored for5 days after injection of LPS. The chemical contents of the ELA were determined by using various chromatographic and spectroscopic techniques. Results: The ELA was found to exhibit a significant anti-inflammatory effect in both in vitro and in vivo models. The results demonstrated that ELA dose-dependently inhibited LPS-induced NO production as well as the protein iN OS and COX-2 expressions. In the septic shock model, ELA dose-dependently protected mice from LPS-induced mortality. Further study on the isolated components of ELA indicated that 9,10-dimethoxycanthin-6-one may contribute significantly to the antiinflammatory effects of the extract. Conclusions: These results suggest that ELA exhibits the anti-inflammatory activity via suppression of pro-inflammatory mediators such as NO, iN OS,and COX-2 and protects mice from LPS-induced mortality in septic shock model.

关键词： Eurycoma longifolia Anti-inflammation Alkaloid 9,10-dimethoxycanthin-6-one