Abstract
Because of the age of relics and the lack of historical data, the geometric forms of missing parts can only be judged by the subjective experience of repair personnel, which leads to varying restoration effects when the geometric structure of the complex relic is reconstructed. Therefore, virtual repair effects cannot fully reflect the historical appearance of cultural relics. In order to solve this problem, this paper presents a virtual restoration method based on the multiscale spatial geometric features of cultural relics in the case of complex construction where the geometric shape of the damaged area is unknown, using the Dazu Thousand-Hand Bodhisattva statue in China as an example. In this study, the global geometric features of the three-dimensional (3D) model are analyzed in space to determine the geometric shape of the damaged parts of cultural relics. The local geometric features are represented by skeleton lines based on regression analysis, and a geometric size prediction model of the defective parts is established, which is used to calculate the geometric dimensions of the missing parts. Finally, 3D surface reconstruction technology is used to quantitate virtual restoration of the defective parts. This method not only provides a new idea for the virtual restoration of artifacts with complex geometric structure, but also may play a vital role in the protection of cultural relics.
Highlights
Computer-aided restoration of cultural heritage relics has made substantial progress, yet it still faces major challenges when the geometry of the damaged parts of artifacts is unknown
Among the studies of virtual restoration of damaged artifacts with complex geometric configurations, researchers have used the constraints on local geometric features of the surface of the artifact model to create a smooth repair of missing parts [13,14,15]
The local geometric features of cultural relics can usually be calculated by geometric calculation on the 3D model, but simple calculation cannot get accurate results on the skeleton line
Summary
Computer-aided restoration of cultural heritage relics has made substantial progress, yet it still faces major challenges when the geometry of the damaged parts of artifacts is unknown. Due to the lack of reliable evidence for restoration, the geometry of the missing parts of many artifacts cannot be specified. Geo-Inf. 2018, 7, 353 ISPRS Int. J. Geo-Inf. 2018, 7, x FOR PEER REVIEW. For damaged and missing parts of an artifact, it is essential to find evidence for virtual restoTrahteiorenfobrye,afnoarldyazminaggietsdbaansdicmgiesosminegtrpyarints tohfeasnaamrteifpaecrt,ioitdisoresosfenthtieasl atomfientdypeev,idsoenthceatfothr evierftfueaclt roefsvtoirrtautaiol nrebstyoraantiaolnyzcianngbietsclboasseictogietsotmrueetrhyisitnortihcealsaapmpeeapraenricoed. Hgeigohm-eptrreiccisfeioantutrherseeo-fdtihmeernesliiocns,aal nmdodtheelsgoefocmuletturricaldriemlicesnsairoenesxtorfatchteedmfriossmintghepaskrtesleatroendlienteesrmasinthede lboycaml gaethoemmeatrtiiccafel aatnuarleyssoisf.the relics, and the geometric dimensions of the missing parts are determined by mTathheempaaptiecrailsaonraglyasniisz.ed as follows. After this introduction, some related works are reviewed in SectiTonhe2,paanpderSiescotirogna3niiznetdroadsufcoelslotwhes.oAveftrearlltphrisocinestrsoodfutchteiopnr,ospoomseedremlaettehdodwaonrkdstahreekreeyvimewetehdodins Sinectthioenp2r,oacnedssS.
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