Utilizing a Terrestrial Laser Scanner for 3D Luminance Measurement of Indoor Environments

Abstract

We aim to present a method to measure 3D luminance point clouds by applying the integrated high dynamic range (HDR) panoramic camera system of a terrestrial laser scanning (TLS) instrument for performing luminance measurements simultaneously with laser scanning. We present the luminance calibration of a laser scanner and assess the accuracy, color measurement properties, and dynamic range of luminance measurement achieved in the laboratory environment. In addition, we demonstrate the 3D luminance measuring process through a case study with a luminance-calibrated laser scanner. The presented method can be utilized directly as the luminance data source. A terrestrial laser scanner can be prepared, characterized, and calibrated to apply it to the simultaneous measurement of both geometry and luminance. We discuss the state and limitations of contemporary TLS technology for luminance measuring.

Fusion of Thermal Point Cloud Series of Buildings for Inspection in Virtual Reality

“…They capture all details without simplification or loss of geometric accuracy [2], similar to raw measurements from laser scanning or photogrammetry. Point clouds are ideal for applications that require accurate measurements of built work, such as architecture, engineering, construction, and cultural heritage [3]. They also avoid errors that can be introduced in mesh generation, such as excessive smoothing or poorly colored textures [4].…”

“…The fusion of 3D thermography with traditional BIM geometry offers new opportunities to create smarter, semantically richer digital building models with direct applications for sustainability and energy efficiency. 2 Kurkela et al [3] describe how measuring luminance distributions in indoor environments can provide valuable information on lighting quality, visual comfort, and aesthetics. By utilizing radiometric calibration techniques and high dynamic range (HDR) imaging, the intensity values recorded in the red, green, and blue channels of the laser scanner panoramic images can be converted into absolute luminance readings and projected onto the measured 3D point cloud [3,11].…”

Shape Completion with Points in the Shadow

“…It has been employed to acquire geometries from small objects [Zeisl et al 2013] to cityscale infrastructure [Lai et al 2011] in various applications such as SLAM and self-driving cars. Although it is possible to acquire full observations via panoramic scanning in some scenarios [Kurkela et al 2021], very often, it requires a completion step as only partial scans can be obtained in many cases [Fei et al 2022].…”