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Extracting Metrics for Three-dimensional Root Systems: Volume and Surface Analysis from In-soil X-ray Computed Tomography Data

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Integrated three-dimensional shape and reflection properties measurement system.

Jakub Krzesłowski¹, Robert Sitnik, Grzegorz Maczkowski

¹Institute of Micromechanics and Photonics, Warsaw University of Technology, Warsaw, Poland. j.krzeslowski@mchtr.pw.edu.pl

|February 2, 2011

Summary

This study introduces a novel system for 3D digital modeling of cultural heritage, integrating surface geometry with bidirectional reflectance distribution function (BRDF) measurements. This combined approach enhances digital reconstruction quality and simplifies data processing for accurate material property analysis.

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Area of Science:

Digital Heritage
Optical Measurement
Computer Vision

Background:

Accurate 3D digital models of cultural heritage require integrating surface geometry with material properties like color and reflectance.
Current laboratory methods for these measurements are manual, subjective, and data-intensive.
A need exists for efficient, objective, and integrated measurement systems outside of laboratory settings.

Purpose of the Study:

To develop and present an out-of-laboratory system for simultaneous 3D shape and bidirectional reflectance distribution function (BRDF) measurement.
To improve the accuracy of digitalized models by integrating spatial data with angular reflectance distribution.
To evaluate the uncertainty associated with BRDF measurements within the proposed system.

Main Methods:

Implementation of a single setup integrating structured light projection and photometric stereo for combined 3D shape and BRDF measurement.
Alignment of spatial data with angular reflectance distribution using a single detector.
Development of a data analysis method to evaluate BRDF uncertainty and characterize diffusive and specular attributes.

Main Results:

The system successfully integrates 3D shape and BRDF measurements in a single setup, reducing subjectivity and manual data integration.
The combined measurement approach yields a better estimation of surface reflective properties and intrinsic material features.
Data analysis provides point-wise diffusive and specular attributes, enabling high-quality digital model reconstruction.

Conclusions:

The developed system offers a more accurate and efficient method for creating high-quality 3D digital models of cultural heritage objects.
Integrating shape and BRDF measurements in one setup significantly enhances the representation of material properties.
This approach simplifies data processing and allows for the rendering of intricate 3D models under arbitrary illumination.