video fields: fusing multiple surveillance videos into a dynamic virtual environment
TRANSCRIPT
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Video Fields: Fusing Multiple Surveillance Videos into a Dynamic Virtual Environment
Ruofei Du, Sujal Bista, Amitabh VarshneyThe Augmentarium| UMIACS | University of Maryland, College Park
{ruofei, sujal, varshney} @ cs.umd.eduwww.VideoFields.com
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image courtesy: university of maryland, college park
IntroductionSurveillance Videos - Monitoring
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image courtesy: www.icsc.org
IntroductionSurveillance Videos – Shopping Centers
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image courtesy: wikipedia
IntroductionSurveillance Videos - Airports
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image courtesy: wikipedia
IntroductionSurveillance Videos – Train stations
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image courtesy: university of maryland, college park
IntroductionSurveillance Videos - Campuses
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image courtesy: university of maryland, college park
IntroductionSurveillance Videos - Conventional
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image courtesy: theimaginativeconservative.org
IntroductionSurveillance Videos – Cognitive Burden
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image courtesy: university of maryland, college park
IntroductionSurveillance Videos – Fusing & Interpreting
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Related WorkFusing Multiple Static Photographs
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Related WorkFusing Multiple Static Photographs
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Related WorkFusing Multiple Static Photographs
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Related WorkFusing Multiple Static Photographs
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Related WorkFusing Multiple Static Photographs
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
RGB
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Related WorkFusing Multiple Dynamic Videos
RGB
RGBD
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
SIGGRAPH 2016Wednesday, 3:30-4:00 PM
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Related WorkFusing Multiple Dynamic Videos
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Our Approach?
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Video Fields
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Video Fields
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IntroductionVideo Field
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IntroductionVideo Field
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Conception, architecting & implementation
Video Fields
A mixed reality system that fuses multiple surveillance videos into an immersive virtual environment,
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Integrating automatic segmentation of moving entities
Video Fields Rendering
Real-time fragment shader processing
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Two algorithms to fuse multiple videos
Early & deferred pruning
These methods use voxels and meshes respectively to render moving entities in the video fields
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Achieving cross-platform compatibility by
WebGL + Three.js
smartphones, tablets, desktop, high-resolution large-area wide field of view tiled display walls, as well as head-mounted displays.
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System Overview
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ArchitectureVideo Fields Flowchart
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ArchitectureVideo Fields Flowchart
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ArchitectureVideo Fields Flowchart
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ArchitectureVideo Fields Flowchart
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Background ModelingMotivation
• Provide a background texture for each camera• Identify moving entities in the rendering stage• Reduce the network bandwidth requirements
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Background ModelingGaussian Mixture Models (GMM)
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Background ModelingAdvantages [Stauffer and Grimson]
More adaptive with:• different lighting conditions,• repetitive motions of scene elements,• moving entities in slow motion
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ArchitectureVideo Fields Flowchart
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SegmentationMoving Entities
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Background ModelingGaussian Mixture Models (GMM)
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ArchitectureVideo Fields Flowchart
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Visibility TestPlus Opacity Modulation
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ArchitectureVideo Fields Flowchart
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Video Fields MappingOverview
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Video Fields MappingChallenges
1. Vertex in the 3D models -> Pixel in the texture space2. Pixel in the texture space -> Vertex on the ground
• The second is useful for projecting a 2D segmentation of a moving entity to the 3D world
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Video Fields MappingProjection Mapping
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Video Fields MappingPerspective correction
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Video Fields MappingDepth Map / Hashing Function
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Early Pruning for Rendering Moving EntitiesVoxels
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Deferred Pruning for Rendering Moving EntitiesBillboards
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Visual ComparisonEarly Pruning vs. Deferred Pruning
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View-dependent Rendering
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View-dependent Rendering
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View-dependent Rendering
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View-dependent Rendering
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Experimental ResultsEarly Pruning vs. Deferred Pruning
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Experimental ResultsEarly Pruning vs. Deferred Pruning
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Experimental ResultsEarly Pruning vs. Deferred Pruning
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Visual ComparisonEarly Pruning vs. Deferred Pruning
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Future WorkScale Up - Hundreds of cameras
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Future WorkBandwidth Problem
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Future WorkHoloportation with RGB cameras
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AcknowledgementAugmentarium Lab | GVIL | UMIACS
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AcknowledgementNSF | Nvidia | MPower | UMIACS
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Video Fieldswww.Video-Fields.com
Thank you! Questions or comments?
Ruofei Du and Amitabh VarshneyAugmentarium Lab | GVIL | UMIACS
Web3D 2016