One-shot BRDF imaging system to obtain surface properties

Abstract

The bidirectional reflectance distribution function (BRDF) that describes an angle-resolved distribution of surface reflectance is available for characterizing surface properties of a material. A one-shot BRDF imaging system can capture an in-plane color mapping of light direction extracted from a surface BRDF distribution. A surface roughness identification method is then proposed here using the imaging system. A difference between surface properties of a matt paper and a glossy paper is experimentally shown to be detected using the method. A surface reconstruction method of an axisymmetric micro-object using the imaging system is also proposed here. The imaging system experimentally shows that it can reconstruct an axisymmetric aluminium cone surface with a height of 37 μm.

Developmental Trends in the Application and Measurement of the Bidirectional Reflection Distribution Function

“…This was used to identify differences in the surface properties of different materials. The reconstruction of the axisymmetric micro-target surface based on data obtained from the one-shot BRDF imaging system has laid the foundation for applications of BRDF data to surface inversion [62,63]. The parameters of measurement instruments discussed in this paper are summarized in Table 1.…”

“…Devices capable of fast measurement are used to determine the reflective properties of the sample in hemispheric space in one shot, with the aid of the optical properties of special surfaces, special optical devices, and optical imaging techniques [34,37,[43][44][45][46][47][48]52,53,[60][61][62][63], or by increasing the area of the detector [49,51,85]. The measurement device uses a special surface reflector to eliminate part of the mechanical motion or increase the area of detection to measure the characteristics of reflection of the sample in hemispheric space at once.…”