Securing Color Fidelity in 3D Architectural Heritage Scenarios

Sensors

Fabio Remondino¹  Fabrizio Ivan Apollonio²  Andrea Ballabeni²  Marco Gaiani² 

[1] 3D Optical Metrology (3DOM) Unit, Bruno Kessler Foundation (FBK), Trento 38123, Italy;Department of Architecture, University of Bologna, Bologna 40136, Italy;

关键词: color acquisition;    color balance;    photogrammetry;    automation;    color management;    structure for motion;    photometric calibration;   

DOI  :  10.3390/s17112437

来源: DOAJ

【 摘 要 】

Ensuring color fidelity in image-based 3D modeling of heritage scenarios is nowadays still an open research matter. Image colors are important during the data processing as they affect algorithm outcomes, therefore their correct treatment, reduction and enhancement is fundamental. In this contribution, we present an automated solution developed to improve the radiometric quality of an image datasets and the performances of two main steps of the photogrammetric pipeline (camera orientation and dense image matching). The suggested solution aims to achieve a robust automatic color balance and exposure equalization, stability of the RGB-to-gray image conversion and faithful color appearance of a digitized artifact. The innovative aspects of the article are: complete automation, better color target detection, a MATLAB implementation of the ACR scripts created by Fraser and the use of a specific weighted polynomial regression. A series of tests are presented to demonstrate the efficiency of the developed methodology and to evaluate color accuracy (‘color characterization’).

【 授权许可】

Unknown