4 Traditional 3D Modeling and Rendering Developments Hidden Surface Removal AlgorithmsShading AlgorithmsShadow CalculationDisplaying Curved SurfacesRay tracing and RadiosityPowerful Modeling Tools
5 Limitations of Traditional 3D Modeling and Rendering Possible to Visualise Complex 3D Models in Real TimeBUT…Creating these 3D models requires Expertise and Time.Rendering is Slow
6 Motivation for Image-based Modeling and Rendering Demand for more complex, realistic modelsTraditional methods slow and costlyMany virtual objects based on real objectsAdvantageous to model directly from real objects
7 Image-based Modeling and Rendering Create 3D models from one or more imagesRe-render creating new viewsEasier to model scenes photorealistically
10 Image-based ModelingImages (photographs, renderings) are used to determine:Scene AppearanceScene GeometryLightingReflectance CharacterisicsKinematic Properties
11 Image-based Rendering Appearance in available views is used to determine appearance in novel viewsNot necessary to perform full illumination computationsRendering is faster
12 Image-based LightingAble to Create a Light-based Model from the imagesFor each part of the local scene, we know its irradianceAllows us to combine real and synthetic graphics with consistent illumination, using images as light sources.
16 Applications VR worlds and Games Creating terrain from Air-Photos Construction of virtual scenesCreating terrain from Air-PhotosImages and Video on the WWWVideo compression, summarisation, skimming, indexing and selective retrieval
17 Tools REALVIZ ImageModeler ERDAS IMAGINE OrthoMax ERDAS Stereo Analyst ERDAS IMAGINE OrthoMaxAutomated DEM extractionERDAS Stereo AnalystProvides tools for collection, interpretation and visualisation of 3D geographic information from stereo imagery3Q Qlonerator Series
18 REALVIZ ImageModeler 1 Start the project Take from 2 to more photos from your scene or object.No other information is requiredStart the projectTake from 2 to more photos from your scene or object, no information from the set or camera, nor special track marks are required
19 REALVIZ ImageModeler 2 Calibrate cameras Add common markers to each photographsImageModeler automatically calibrates your camerasCalibrate cameras
20 Model your scene or object using standard polygon modeling tools: REALVIZ ImageModeler 3Model your scene or object using standard polygon modeling tools:Create a modelModel your scene or object using standard polygon modeling tools:extrude, path extrude, bevel tool, split polygon, mirror object, merge objects, snap and pin primitive tools
21 Capture textures per face, or unfolded single textures REALVIZ ImageModeler 4Capture textures per face, or unfolded single texturesTexture a model
22 Export camera, objects and textures to your favorite 3D application REALVIZ ImageModeler 5Export camera, objects and textures to your favorite 3D applicationExport a model
24 Challenges Automatic scene segmentation Complex scenes eg. forests Non-static scenesInaccuracies in source photosReal imagery/computer vision problemsCamera pose hard to getDepth even harder to getData Size may be hugeChanges Difficultlights, geometry, etc.
25 SummaryOverall… exciting developments and much more potential for Image-based modeling, rendering and lighting.
26 Sources http://i31www.ira.uka.de/~oel/ibmr-focus/ 3D modeling from images tutorialERDAS ProductsREALVIZ ImageModeller