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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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High-Resolution Measurement of Surface Normal Maps Using Specular Reflection Imaging.

Shinichi Inoue¹, Yoshinori Igarashi², Seiji Suzuki²

¹Faculty of Engineering, Tokyo Polytechnic University, 5-45-1 Iiyamaminami, Atsugi 243-0297, Japan.

Journal of Imaging

|April 27, 2026

Summary

This study introduces an imaging technique to measure surface normal vectors, creating detailed normal maps. These maps offer high-resolution surface analysis for industrial inspection and realistic gloss reproduction in computer graphics.

Keywords:

appearance industrial inspection measurement method normal maps specular reflection surface analysis surface normal vectors

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Area of Science:

Optics and Photonics
Computer Graphics
Materials Science

Background:

Evaluating material surface properties is crucial for industrial applications.
Visual assessments of reflective properties are common but lack quantitative accuracy.
Existing methods struggle to provide high-resolution spatial distribution of surface normals.

Purpose of the Study:

To present a novel imaging-based technique for measuring surface normal vectors.
To achieve high angular and spatial resolution in surface normal measurements.
To generate normal maps for quantitative surface analysis and computer graphics applications.

Main Methods:

Developed a dedicated measurement apparatus for capturing specular reflections.
Employed a color-mapping technique to visualize spatial distribution of surface normal vectors.
Achieved 1024 × 1024 sampling points with 0.02 × 0.02 mm spatial resolution and ~0.1° angular resolution.

Main Results:

Generated high-resolution normal maps for various materials (plastic, ceramic tile, paper, aluminum).
Demonstrated that the spatial distribution of surface normals correlates with surface roughness and perceived texture.
Validated the technique's capability for both industrial inspection and computer graphics.

Conclusions:

The developed imaging technique provides accurate and high-resolution measurement of surface normal vectors.
Normal maps derived from this method enable quantitative surface analysis and realistic gloss reproduction.
This technique addresses the need for reliable surface property evaluation in appearance-critical industries.