Abstract
Abstract. 3D digital reconstruction techniques are extensively used for quality control purposes. Among them, photogrammetry and photometric stereo methods have been for a long time used with success in several application fields. However, generating highly-detailed and reliable micro-measurements of non-collaborative surfaces is still an open issue. In these cases, photogrammetry can provide accurate low-frequency 3D information, whereas it struggles to extract reliable high-frequency details. Conversely, photometric stereo can recover a very detailed surface topography, although global surface deformation is often present. In this paper, we present the preliminary results of an ongoing project aiming to combine photogrammetry and photometric stereo in a synergetic fusion of the two techniques. Particularly, hereafter, we introduce the main concept design behind an image acquisition system we developed to capture images from different positions and under different lighting conditions as required by photogrammetry and photometric stereo techniques. We show the benefit of such a combination through some experimental tests. The experiments showed that the proposed method recovers the surface topography at the same high-resolution achievable with photometric stereo while preserving the photogrammetric accuracy. Furthermore, we exploit light directionality and multiple light sources to improve the quality of dense image matching in poorly textured surfaces.
Highlights
In the field of industrial metrology, there is a rising need for 3D information at a very high resolution for micro-measurements and quality inspection of object surfaces
Our work aims to complement weakness of photometric stereo and photogrammetry by (i) deriving scale and accurate low-frequency measurements using photogrammetry, (ii) acquiring finely detailed topography of the surveyed object using photometric stereo and (iii) co-registering and merging all acquired 3D information
For the first object (100x100 mm gold foiled surface shaped like a Euro coin - Figure 1a), we aimed to show how the proposed integrated approach performs in fusing photometric stereo and photogrammetry measurements
Summary
In the field of industrial metrology, there is a rising need for 3D information at a very high resolution for micro-measurements and quality inspection of object surfaces. Photometric stereo can recover a very detailed topography of objects even with textureless or shiny surfaces (Li et al, 2020; Wang et al, 2020; Wei et al, 2020). Our work aims to complement weakness of photometric stereo and photogrammetry by (i) deriving scale and accurate low-frequency measurements using photogrammetry, (ii) acquiring finely detailed topography of the surveyed object using photometric stereo and (iii) co-registering and merging all acquired 3D information
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