Two-Dimensional Shape Analysis of Complex Geometry Based on Photogrammetric Models of Iconostases

Isidora Đurić,Ivana Vasiljević,Ratko Obradović,Nebojša Ralević,Vesna Stojaković

doi:10.3390/app11157042

Abstract

Three-dimensional digitization technologies have been proved as reliable methods for detailed and accurate spatial data collection from existing cultural heritage. In addition, the point segmentation techniques are particularly relevant for contour detection and classification of the unstructured point cloud. This paper describes an approach to obtain 2D CAD-like visualizations of complex geometry from photogrammetric models so that the detected contours of particular object elements can be used for 2D shape analysis. The work process uses the point clouds derived from photogrammetric models to create the plane visualization of the object’s geometry by segmenting points based on the verticality geometric feature. The research presented is on the case studies of iconostases as the specific art and architectural elements of the Christian Orthodox church that can be appreciated only in situ. To determine relations between the characteristics of the particular shapes and the iconostases’ style origins, the mathematical method of shape analysis was applied. This study aims to numerically describe the stylistic characteristics of the shapes of the main parts of the iconostasis concerning the artistic period to which it belongs to. The concept was based on the consideration of global shape descriptors and associated shape measurements which were used to analyze and classify the stylistic characteristics of the iconostases. The methodology was applied to the representative examples of three iconostases from the Baroque and Classicism art movements. The results illustrated that the proposed methods and techniques, with certain improvements, could be helpful for CAD visualization and shape analysis of complex geometry.

Highlights

Two decades have passed since the pioneering digital heritage project, the Digital Michelangelo Project [1], three-dimensional (3D) digitization still represents a flourishing field of research and application in cultural heritage
The research presented in this paper focuses on the basic application of mathematical shape descriptors, while working with digitized data of cultural heritage inside a computer aided design (CAD) environment
We focused on the shape analysis of photogrammetric models of the iconostases as the specific elements of the Christian Orthodox church heritage

Summary

Introduction

Two decades have passed since the pioneering digital heritage project, the Digital Michelangelo Project [1], three-dimensional (3D) digitization still represents a flourishing field of research and application in cultural heritage. Ever since 3D acquisition and digitizing technologies have been proved as sufficiently developed for extensive application in the field of tangible cultural heritage, they have been used for reconstruction, conservation, digital restoration, and monitoring, as well as for physical replication and remote fruition [2]. In the context of the Christian Orthodox church heritage, the iconostasis represents one of the most notable features and the dominating art and architectural element of the church interior. The iconostasis, whose name originates from the Greek language and means ‘icon stand’, represents a highly ornamented element of the Christian Orthodox church interiors, which serves simultaneously as a vertical frame composed of icons and the physical division between a sanctuary containing an altar and a nave in a church

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