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1、華中科技大學(xué)碩士學(xué)位論文摘要三維點(diǎn)云數(shù)據(jù)可以表現(xiàn)豐富的物體表面細(xì)節(jié),是描述物體三維模型的有利工具。但由于噪聲、數(shù)據(jù)缺失等因素的影響,三維重構(gòu)方法所獲得的點(diǎn)云數(shù)據(jù)往往不符合實(shí)際應(yīng)用的需要。因此,對三維點(diǎn)云數(shù)據(jù)的進(jìn)一步處理如光順和修復(fù)就顯得十分重要。本課題以通過圖像重構(gòu)所生成的三維點(diǎn)云數(shù)據(jù)為對象,研究其光順和修復(fù)的方法。本文深入探討了基于三維點(diǎn)云數(shù)據(jù)的曲面曲率求解方法,得到了描述曲面微觀特性的物理量:平均曲率和高斯曲率,并進(jìn)一步利用曲面曲率特點(diǎn),實(shí)現(xiàn)了曲面的區(qū)域劃分。生命系統(tǒng)自組織行為中體現(xiàn)出的自組織原理和方法,為眾多領(lǐng)域所借鑒。將三維點(diǎn)云中的每一個(gè)點(diǎn)看作是具有生命力的單
2、元,所有點(diǎn)云便構(gòu)成了一個(gè)由生命單元組成的生命體,便可用生命體自組織原理來研究點(diǎn)云數(shù)據(jù)的光順與修復(fù)問題。本文將自組織原理應(yīng)用于三維點(diǎn)云數(shù)據(jù)光順處理,結(jié)合點(diǎn)云數(shù)據(jù)的特點(diǎn),在比較現(xiàn)有點(diǎn)云數(shù)據(jù)光順方法的基礎(chǔ)之上,借鑒了圖像處理中的均值濾波方法,實(shí)現(xiàn)了點(diǎn)云數(shù)據(jù)的自組織光順。對比實(shí)驗(yàn)結(jié)果證明此方法光順?biāo)俣瓤?,效果好,能很好地完成對點(diǎn)云數(shù)據(jù)的光順。本文進(jìn)一步將自組織原理應(yīng)用于點(diǎn)云數(shù)據(jù)修復(fù)。利用二次曲面擬合曲面微觀形狀,求得修復(fù)后的點(diǎn)云數(shù)據(jù)的值。在所有點(diǎn)云數(shù)據(jù)完成一次修復(fù)迭代后,用點(diǎn)云數(shù)據(jù)的擬合值替換原值形成新的曲面,并運(yùn)用相對分散度來控制迭代次數(shù),最終實(shí)現(xiàn)對點(diǎn)云數(shù)據(jù)的自組織修復(fù)。本
3、文構(gòu)建了基于OpenGL和VC6.0的三維模型顯示環(huán)境,并利用文中提出的點(diǎn)云數(shù)據(jù)光順和修復(fù)方法,開發(fā)出三維點(diǎn)云數(shù)據(jù)自組織光順與模型修復(fù)軟件。關(guān)鍵詞:三維點(diǎn)云數(shù)據(jù)自組織光順模型修復(fù)I華中科技大學(xué)碩士學(xué)位論文Abstract3Dpointscloudcanpresentabundancedetails,alsoitisasharptooltorepresentobjectmodel.Becauseoftheinterferentialdataandleakofdata,thedatafromreverseengineeringisnotappliedinactualsit
4、uation.Soitisneededtomodelthe3Dpointscloudoffairnessandmodification.Thethesisdotheresearchofthetechnologyaboutfairnessandmodificationbasedonpointscloudfromimagereverseengineering.Thethesisdothedeepresearchoftheevaluationaboutthesurfacecurvature,thengetMeancurvatureandGaussiancurvature,w
5、hichrepresentthesurfacedifferentialproperties.Bythehelpofthetraitofcurvature,thethesiscompletethesegmentionofpointscloud.Self-organizationtheoryisdevelopingwidelyrecently,andusinginmanyfields.Everymemberinself-organizationisthinktobeactive.Iniscreativetointroducetheself-organizationinto
6、thequestionaboutthefairnessandmodificationbasedonthepointscloud.Aftertheself-organizationtheoryisintroducedinto3Dpointscloud,andcomparethecurrentfairnessmethodsofpointscloud,thenthethesischoosethetrimmedmeanfiltertoaccomplishthefairness,itisfastinthepointscloudself-organizationfairness,
7、andfulfillwiththeneedofself-organizationfairness.Duringtheprocessofpointscloudmodification,aparametricquadricsurfaceapproximationmethodisusedtoapproximatethesurface,thenthethesiscalculatethemodifiedpointscloudresult.Afterallthepointscloudalternatedonetime,usethemodifiedresultre