本文關(guān)鍵詞： 光度立體 陰影恢復(fù)形狀 三維重建 光照反射模型　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：文物作為文化變遷和文明發(fā)展的見證和記錄,包含著重要的文化歷史價(jià)值,對于文化傳承和歷史考證具有重大的意義。同時(shí),由于文物本身在經(jīng)受自然因素、人為因素的不斷損耗,因此加強(qiáng)文物保護(hù)、減少文物在展出過程中的損耗刻不容緩。文物數(shù)字化技術(shù)的提出,既能夠?qū)⑽奈镆詳?shù)字化模型永遠(yuǎn)保存下來,又能夠以數(shù)字化的形式來廣泛展出,使得更多的人能夠接觸到文物本身所代表的文化,對于文化傳播和文物保護(hù)都具有深遠(yuǎn)的意義。光度立體技術(shù),能夠在不接觸物體的情況下得到物體本身的三維信息,可以在不對文物造成接觸的情況下得到文物的三維模型和表面光照反射信息,得到的三維模型具有精度高,紋理細(xì)節(jié)保存完整等優(yōu)點(diǎn)。同時(shí),傳統(tǒng)的光度立體技術(shù)存在適用材質(zhì)范圍較小,對于采集條件要求較為苛刻等缺點(diǎn),只能夠在理想的實(shí)驗(yàn)環(huán)境下得到較好的結(jié)果,不能夠廣泛應(yīng)用于文物數(shù)字化的工程實(shí)際中。針對工程應(yīng)用中存在的問題,本文提出了一種基于未知光照情況,各向同性反射模型的快速光度立體技術(shù),用于采集小型文物的三維信息,重建得到完整精密模型的三維重建系統(tǒng)。本文主要的工作有:針對傳統(tǒng)光度立體方法光照條件已知的約束,提出了基于未知光照條件的光度立體方法,解決了工程應(yīng)用中光照條件測量難以實(shí)現(xiàn)的問題;針對理想模型適用的材質(zhì)范圍有限,復(fù)雜參數(shù)模型需要大量的測量和先驗(yàn)知識的不足,提出了利用多種材質(zhì)共同的光照反射性質(zhì),使用通用各向同性光照反射模型的光度立體方法,能夠應(yīng)對現(xiàn)實(shí)中存在的廣泛的材質(zhì)。將上述技術(shù)應(yīng)用于小型文物數(shù)字化工作,實(shí)現(xiàn)了能夠快速自動采集圖像,計(jì)算三維點(diǎn)云,重建小型文物高保真的光度立體系統(tǒng)。
[Abstract]:Cultural relics, as witnesses and records of cultural change and civilization development, contain important cultural and historical values, which are of great significance for cultural heritage and historical textual research. At the same time, because the cultural relics themselves are undergoing natural factors, Because of the constant wear and tear of human factors, it is imperative to strengthen the protection of cultural relics and reduce the loss of cultural relics in the course of exhibition. With the development of the digitized technology of cultural relics, the cultural relics can be preserved as a digital model forever. It can also be widely displayed in the form of digitization, so that more people can have access to the culture represented by the cultural relics themselves, which is of far-reaching significance for cultural transmission and the preservation of cultural relics. The three-dimensional information of the object itself can be obtained without touching the object, and the three-dimensional model of the cultural relic and the reflection information of the surface illumination can be obtained without contact with the cultural relic. The obtained three-dimensional model has high accuracy. At the same time, the traditional photometric stereoscopic technology has some disadvantages, such as small applicable material range and demanding acquisition conditions, so it can only get better results in ideal experimental environment. It can not be widely used in the engineering practice of digitization of cultural relics. In view of the problems existing in the engineering application, this paper presents a fast photometric stereoscopic technique based on the isotropic reflection model of unknown illumination. It is used to collect 3D information of small cultural relics and reconstruct the 3D reconstruction system with complete and precise model. The main work of this paper is: aiming at the constraints of known illumination conditions of traditional photometric stereoscopic methods, The photometric stereoscopic method based on unknown illumination condition is proposed, which solves the problem that the measurement of illumination condition is difficult to realize in engineering application, and the material range of ideal model is limited. The complex parameter model needs a great deal of measurement and prior knowledge. This paper puts forward a photometric stereoscopic method using the common illumination reflection property of many materials and the general isotropic light reflection model. By applying the above technology to the digitization of small cultural relics, the photometric stereoscopic system, which can quickly and automatically collect images, calculate 3D point clouds and reconstruct high-fidelity miniature cultural relics, can be applied to deal with the wide range of materials in reality.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：K87;TP391.41

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本文編號：1551864