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ReLoc:Indoor Visual Localization with Hierarchical Sitemap and view synthesis

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Journal of Computer Science & Technology 2021年第3期36卷 494-507页

作者： Hui-Xuan Wang Jing-Liang Peng Shi-Yi Lu Xin Cao Xue-Ying Qin Chang-He Tu School of Computer Science and Technology Shandong UniversityQingdao 266237China School of Information Science and Engineering University of JinanJinan 250022China School of Software Shandong UniversityJinan 250101China

Indoor visual localization,i.e.,6 Degree-of-Freedom camera pose estimation for a query image with respect to a known scene,is gaining increased attention driven by rapid progress of applications such as robotics and augmented ***,drastic visual discrepancies between an onsite query image and prerecorded indoor images cast a significant challenge for visual *** this paper,based on the key observation of the constant existence of planar surfaces such as floors or walls in indoor scenes,we propose a novel system incorporating geometric information to address issues using only pixelated *** the system implementation,we contribute a hierarchical structure consisting of pre-scanned images and point cloud,as well as a distilled representation of the planar-element layout extracted from the original dataset.A view synthesis procedure is designed to generate synthetic images as complementary to that of a sparsely sampled ***,a global image descriptor based on the image statistic modality,called block mean,variance,and color(BMVC),was employed to speed up the candidate pose identification incorporated with a traditional convolutional neural network(CNN)*** results on a popular benchmark demonstrate that the proposed method outperforms the state-of-the-art approaches in terms of visual localization validity and accuracy.

关键词： visual localization planar surface statistic information view synthesis

Joint view synthesis and disparity refinement for stereo matching

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Frontiers of Computer Science 2019年第6期13卷 1337-1352页

作者： Gaochang WU Yipeng LI Yuanhao HUANG Yebin LIU State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819China Broadband Network&Digital Media Lab Department of AutomationTsinghua UniversityBeijing 100084China Orbbec Company Shenzhen 518061China

Typical stereo algorithms treat disparity estimation and view synthesis as two sequential *** this paper,we consider stereo matching and view synthesis as two complementary components,and present a novel iterative refinement model for joint view synthesis and disparity *** achieve the mutual promotion between view synthesis and disparity refinement,we apply two key strategies,disparity maps fusion and disparity-assisted plane sweep-based rendering(DAPSR).On the one hand,the disparity maps fusion strategy is applied to generate disparity map from synthesized view and input *** strategy is able to detect and counteract disparity errors caused by potential artifacts from synthesized *** the other hand,the DAPSR is used for view synthesis and updating,and is able to weaken the interpolation errors caused by outliers in the disparity *** on Middlebury benchmarks demonstrate that by introducing the synthesized view,disparity errors due to large occluded region and large baseline are eliminated effectively and the synthesis quality is greatly improved.

关键词： stereo matching view synthesis disparity refinement

3DV quality model based depth maps for view synthesis in FTV system

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Journal of Shanghai University(English Edition) 2011年第4期15卷 335-341页

作者：张秋闻安平张艳张兆杨王元庆 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of EducationShanghai 200072P.R.China School of Communication and Information Engineering Shanghai University Department of Computer Science and Technology Anhui University of Finance and EconomicsBengbu 230030AuhuiP.R.China Department of Electronics Science and Engineering Nanjing University

Depth maps are used for synthesis virtual view in free-viewpoint television （FTV） systems. When depth maps are derived using existing depth estimation methods, the depth distortions will cause undesirable artifacts in the synthesized views. To solve this problem, a 3D video quality model base depth maps （D-3DV） for virtual view synthesis and depth map coding in the FTV applications is proposed. First, the relationships between distortions in coded depth map and rendered view are derived. Then, a precisely 3DV quality model based depth characteristics is develop for the synthesized virtual views. Finally, based on D-3DV model, a multilateral filtering is applied as a pre-processed filter to reduce rendering artifacts. The experimental results evaluated by objective and subjective methods indicate that the proposed D-3DV model can reduce bit-rate of depth coding and achieve better rendering quality.

关键词： free-viewpoint television (FTV) 3D video quality model base depth maps (D-3DV) view synthesis

DELAUNAY TRIANGULATION AND IMAGE DENSE MATCHING IN view synthesis

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Chinese Journal of Aeronautics 1999年第3期12卷 45-49页

作者：沈沛意王伟吴成柯西安电子科技大学信息工程系综合业务网理论及关键技术国家重点实验室陕西西安

A new method of view synthesis is proposed based on Delaunay triangulation. The first step of this method is making the Delaunay triangulation of 2 reference images. Secondly, matching the image points using the epipolar geometry constraint. Finally, constructing the third view according to pixel transferring under the trilinear constraint. The method gets rid of the classic time consuming dense matching technique and takes advantage of Delaunay triangulation. So it can not only save the computation time but also enhance the quality of the synthesized view. The significance of this method is that it can be used directly in the fields of video coding, image compressing and virtual reality.

关键词： view synthesis Delaunay triangulation image matching pixel transferring

Image Mosaic Based view synthesis for Interactive Stereoscopic Display

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Image Mosaic Based View Synthesis for Interactive Stereoscop...

Real-time distance field acceleration based free-viewpoint video synthesis for large sports fields

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作者： Giuyan Guo Key Laboratory of Advanced Displays and System Application Ministry of EducationShanghai 200072China School of Communication and Information EngineeringShanghai UniversityShanghai 200072China

In stereoscopic display,view synthesis is a key technology to realize interactivity what is the ability to look around with- in a three dimensional(3D)scene by freely choosing a *** paper presents an intermediate view synthesis al- gorithm,combining view interpolation with view morphing based on image ***,the original stereo image pairs are ***,the disparity of only object area is estimated by a predict recursion method to improve the matching speed and ***,credible areas in left and right views should be determined and chosen to create a transi- tional *** last,a method combining view interpolation and morphing is used to synthesis the intermediate view from the transitional *** results show that the edge of created intermediate view object is clear and smooth,and the processing speed of view synthesis is obviously *** algorithm can be used in interactive stereoscopic dis- play in varius 3D video application which an arbitrary view needs to be rendered in real-time.

关键词： view synthesis view Morphing Image Mosaic Transitional view

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Computational Visual Media 2024年第2期10卷 331-353页

作者： Yanran Dai Jing Li Yuqi Jiang Haidong Qin Bang Liang Shikuan Hong Haozhe Pan Tao Yang School of Telecommunications Engineering Xidian UniversityXi’an 710071China National Engineering Laboratory for Integrated AeroSpace-Ground-Ocean Big Data Application Technology SAIIPthe School of Computer ScienceNorthwestern Polytechnical UniversityXi’an 710129China

Free-viewpoint video allows the user to view objects from any virtual perspective,creating an immersive visual *** technology enhances the interactivity and freedom of multimedia ***,many free-viewpoint video synthesis methods hardly satisfy the requirement to work in real time with high precision,particularly for sports fields having large areas and numerous moving *** address these issues,we propose a freeviewpoint video synthesis method based on distance field *** central idea is to fuse multiview distance field information and use it to adjust the search step size *** step size search is used in two ways:for fast estimation of multiobject three-dimensional surfaces,and synthetic view rendering based on global occlusion *** have implemented our ideas using parallel computing for interactive display,using CUDA and OpenGL frameworks,and have used real-world and simulated experimental datasets for *** results show that the proposed method can render free-viewpoint videos with multiple objects on large sports fields at 25 ***,the visual quality of our synthetic novel viewpoint images exceeds that of state-of-the-art neural-rendering-based methods.

关键词： free-viewpoint video view synthesis camera array distance field sports video

Homography-guided stereo matching for wide-baseline image interpolation

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Computational Visual Media 2022年第1期8卷 119-133页

作者： Yuan Chang Congyi Zhang Yisong Chen Guoping Wang Peking University Beijing 100871China Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China The University of Hong Kong Hong KongChina

Image interpolation has a wide range of applications such as frame rate-up conversion and free viewpoint *** significant progresses,it remains an open challenge especially for image pairs with large *** this paper,we first propose a novel optimization algorithm for motion estimation,which combines the advantages of both global optimization and a local parametric transformation *** perform optimization over dynamic label sets,which are modified after each iteration using the prior of piecewise consistency to avoid local *** we apply it to an image interpolation framework including occlusion handling and intermediate image *** validate the performance of our algorithm experimentally,and show that our approach achieves state-of-the-art performance.

关键词： image interpolation view synthesis homo-graphy propagation belief propagation

A Survey on Multiview Video synthesis and Editing

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Tsinghua Science and Technology 2016年第6期21卷 678-695页

作者： Shaoping Lu Taijiang Mu Songhai Zhang the Department of Electronics and Informatics (ETRO) Vrije Universiteit Brussel (VUB) the TNList Tsinghua University

Multiview video can provide more immersive perception than traditional single 2-D video. It enables both interactive free navigation applications as well as high-end autostereoscopic displays on which multiple users can perceive genuine 3-D content without glasses. The multiview format also comprises much more visual information than classical 2-D or stereo 3-D content, which makes it possible to perform various interesting editing operations both on pixel-level and object-level. This survey provides a comprehensive review of existing multiview video synthesis and editing algorithms and applications. For each topic, the related technologies in classical 2-D image and video processing are reviewed. We then continue to the discussion of recent advanced techniques for multiview video virtual view synthesis and various interactive editing applications. Due to the ongoing progress on multiview video synthesis and editing, we can foresee more and more immersive 3-D video applications will appear in the future.

关键词： multiview video view synthesis video editing color correction survey

view interpolation networks for reproducing the material appearance of specular objects

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Virtual Reality & Intelligent Hardware 2023年第1期5卷 1-10页

作者： Chihiro HOSHIZAWA Takashi KOMURO Graduate School of Science and Engineering Saitama University338-8570255 Shimo-Okubo Sakura-ku SaitamaJapan

Background In this study, we propose view interpolation networks to reproduce changes in the brightness of an object′s surface depending on the viewing direction, which is important for reproducing the material appearance of a real object. Method We used an original and modified version of U-Net for image transformation. The networks were trained to generate images from the intermediate viewpoints of four cameras placed at the corners of a square. We conducted an experiment using with three different combinations of methods and training data formats. Result We determined that inputting the coordinates of the viewpoints together with the four camera images and using images from random viewpoints as the training data produces the best results.

关键词： view synthesis Image transformation network Reflectance reproduction Material appearance U-Net