Interactive Rendering of Large Volume Data Sets

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1、InteractiveRenderingofLargeVolumeDataSetsStefanGutheMichaelWandJuliusGonserWolfgangStraßerWSI/GRIS,UniversityofTübingenAbstractintomainmemoryondemand.Thisleadstoconsiderableband-widthandlatencyproblems.ThesecondproblemisthesizeoftheWepresentanewalgorithmforrenderingveryla

2、rgevolumedatavoxeldatathatremainsafterprojectiveclassification:AlthoughsetsatinteractiveframeratesonstandardPChardware.Thealgo-thesizeisO(logn),theconstantsinthe“O-notation”arestillrithmacceptsscalardatasampledonaregulargridasinput.Themuchtoohigh.Thenumberofvoxelsexceedsb

3、yfarthetextureinputdataisconvertedintoacompressedhierarchicalwaveletmemoryaswellasthealpha-blendingcapacitiesofacommodityrepresentationinapreprocessingstep.Duringrendering,thegraphicsboard.waveletrepresentationisdecompressedon-the-flyandrenderedOurnovelalgorithmusesahiera

4、rchicalwaveletrepresentationusinghardwaretexturemapping.Thelevelofdetailusedfortotackletheseproblems:Thevolumeisstoredasahierarchyofrenderingisadaptedtothelocalfrequencyspectrumofthedatawaveletcoefficients.Onlythelevelsofdetailnecessaryfordis-anditspositionrelativetothevi

5、ewer.Usingaprototypeimple-playaredecompressedandsenttothetexturinghardware.Theusementationofthealgorithmwewereabletoperformaninteractiveofawaveletrepresentationallowsustocompressthedatabyawalkthroughoflargedatasetssuchasthevisiblehumanonaratiooftypically30:1withoutnoticea

6、bleartifactsintheimage.singleof-the-shelfPC.Thisway,evenverylargedatasetscanbestoredinmainmemory.Thevisiblehumandatasetcane.g.bestoredin222MB(insteadCategoriesandSubjectDescriptors:E.4[CodingandInforma-of6.5GB).Duringrendering,thewaveletrepresentationallowsustionTheory]:D

7、ataCompactionandCompressionI.3.1[ComputertoanalyzethelocalfrequencyspectruminthedatasetandtoGraphics]:PictureandImageGeneration–Graphicsprocessors;adapttherenderingresolutiontoit.Thisway,wecanreducetheI.3.3[ComputerGraphics]:PictureandImageGeneration–sizeofthevoxelsettobe

8、renderedconsiderablywithminimalViewingalgorithmslossofimagequality.Usingthesetechniques,weareabl