Combining Pattern Projection and Cross Polarization to Enhance 3d Reconstruction of Featureless Reflective Surfaces

Abstract

Abstract. 3D digitisation is essential to enhance knowledge and conservation processes for Cultural Heritage (CH). However, movable heritage collected in museums, e.g., archeological finds, statues, coins, and musical instruments, often consists of highly reflective surfaces and/or featureless textures. The aim of this work is to stress the Structure from Motion Dense MultiView Reconstruction (SfM-DMVR) of objects, whose optical properties are challenging to this image-based technique. To improve the results obtained by SfM-DMVR standard acquisition workflow, this study exploited the potential of combining Noise Function Pattern (NFP) projection and light Cross Polarization (CP). Moreover, High Dynamic Range (HDR) image reconstruction was tested on images acquired according to different CP angles. The SfM-DMVR of a texture-less shiny ceramic object was then compared to the one obtained by a structured light triangulation scanner, the most reliable tool for such surfaces, but unfortunately quite expensive. The advantages and limitations of the presented method are discussed.

Optimizing Milling Parameters for Enhanced Machinability of 3D‐Printed Materials: An Analysis of PLA, PETG, and Carbon Fiber Reinforced PETG

“…Originally known as Rapid Prototyping (RP), Addictive Manufacturing (AM) has been long considered the process of rapidly creating a part before final commercialization. However, due to recent technological advances, its applications continuously increase across diverse industrial applications (e.g., automotive and aerospace [1,2], food production [3,4], medicine [5], civil and biomedical engineering and even art and architecture [6][7][8]), as it keeps the promise to manufacture parts and components efficiently and cost-effectively as in mass production [9].…”