Structured light in addition to active ranging techniques Class 11 per-pixel optimization p

Structured light in addition to active ranging techniques Class 11 per-pixel optimization p www.phwiki.com

Structured light in addition to active ranging techniques Class 11 per-pixel optimization p

White, Stephen, Morning Drive Host and General Manager has reference to this Academic Journal, PHwiki organized this Journal Structured light in addition to active ranging techniques Class 11 per-pixel optimization per-scanline optimization full image optimization last Tuesday: stereo polar rectification planar rectification original image pair

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Plane-sweep multi-view matching Simple algorithm as long as multiple cameras No rectification necessary, but also no gain Doesn’t deal with occlusions Collins’96; Roy in addition to Cox’98 (GC); Yang et al.’02/’03 (GPU) Today’s class unstructured light structured light time-of-flight (some slides from Szymon Rusinkiewicz, Brian Curless) A Taxonomy

A taxonomy Unstructured light project texture to disambiguate stereo Space-time stereo Davis, Ramamoothi, Rusinkiewicz, CVPR’03

Space-time stereo Davis, Ramamoothi, Rusinkiewicz, CVPR’03 Space-time stereo Zhang, Curless in addition to Seitz, CVPR’03 Space-time stereo results Zhang, Curless in addition to Seitz, CVPR’03

Triangulation Triangulation: Moving the Camera in addition to Illumination Moving independently leads to problems with focus, resolution Most scanners mount camera in addition to light source rigidly, move them as a unit Triangulation: Moving the Camera in addition to Illumination

Triangulation: Moving the Camera in addition to Illumination (Rioux et al. 87) Triangulation: Extending to 3D Possibility 1: add another mirror (flying spot) Possibility 2: project a stripe, not a dot Object Triangulation Scanner Issues Accuracy proportional to working volume (typical is ~1000:1) Scales down to small working volume (e.g. 5 cm. working volume, 50 m. accuracy) Does not scale up (baseline too large ) Two-line-of-sight problem (shadowing from either camera or laser) Triangulation angle: non-uni as long as m resolution if too small, shadowing if too big (useful range: 15-30)

Triangulation Scanner Issues Material properties (dark, specular) Subsurface scattering Laser speckle Edge curl Texture embossing Space-time analysis Curless ‘95

Space-time analysis Curless ‘95 Projector as camera Multi-Stripe Triangulation To go faster, project multiple stripes But which stripe is which Answer 1: assume surface continuity e.g. Eyetronics’ ShapeCam

White, Stephen KGCB-FM Morning Drive Host and General Manager www.phwiki.com

Real-time system Koninckx in addition to Van Gool Multi-Stripe Triangulation To go faster, project multiple stripes But which stripe is which Answer 2: colored stripes (or dots) Multi-Stripe Triangulation To go faster, project multiple stripes But which stripe is which Answer 3: time-coded stripes

Time-Coded Light Patterns Assign each stripe a unique illumination code over time [Posdamer 82] Space Time An idea as long as a project Bouget in addition to Perona, ICCV’98 Pulsed Time of Flight Basic idea: send out pulse of light (usually laser), time how long it takes to return

Depth from focus/defocus Nayar’95 Nov. 8, don’t miss Distinguished lecture! Next class: structure from motion

White, Stephen Morning Drive Host and General Manager

White, Stephen is from United States and they belong to KGCB-FM and they are from  Prescott, United States got related to this Particular Journal. and White, Stephen deal with the subjects like Religious Programming

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This Particular Journal got reviewed and rated by Excelsior College and short form of this particular Institution is US and gave this Journal an Excellent Rating.