A High Throughput Integrated Hyperspectral Imaging and 3D Measurement System

Abstract

Hyperspectral and three-dimensional measurements can obtain the intrinsic physicochemical properties and external geometrical characteristics of objects, respectively. The combination of these two kinds of data can provide new insights into objects, which has gained attention in the fields of agricultural management, plant phenotyping, cultural heritage conservation, and food production. Currently, a variety of sensors are integrated into a system to collect spectral and morphological information in agriculture. However, previous experiments were usually performed with several commercial devices on a single platform. Inadequate registration and synchronization among instruments often resulted in mismatch between spectral and 3D information of the same target. In addition, using slit-based spectrometers and point-based 3D sensors extends the working hours in farms due to the narrow field of view (FOV). Therefore, we propose a high throughput prototype that combines stereo vision and grating dispersion to simultaneously acquire hyperspectral and 3D information. Furthermore, fiber-reformatting imaging spectrometry (FRIS) is adopted to acquire the hyperspectral images. Test experiments are conducted for the verification of the system accuracy, and vegetation measurements are carried out to demonstrate its feasibility. The proposed system is an improvement in multiple data acquisition and has the potential to improve plant phenotyping.

Rotational hyperspectral scanner and related image reconstruction algorithm

“…As we all know, rotational movement is more stable and less complex than conventional translational movement. 3D shape reconstruction is another hot topic recently [28][29][30] . Instead of translational scanning, our rotational hyperspectral scanner works in a gaze (staring) state (the central location is fixed in a 3D coordinate system) without any filter.…”

Measurement Simulation System of Fringe Projection Profilometry Based on Ray Tracing

“…Peter lutzk et al [14] conducted Monte Carlo simulation of 3D measurements of transparent objects, but the calculation was com-plex and time-consuming. Peter lutzk et al proposed a 3D measurement system integrated hyperspectral imaging, which was an improvement in multiple data acquisition [15]. Stephan presented a simulation toolset for computer aided inspection planning of 3D laser scanner [16].…”

Portable 4d Snapshot Hyperspectral Imager for Fastspectral and Surface Morphology Measurements

“…As 3D imaging and HSI provide two pertinent types of information related to intrinsic properties that are key metrics for substance identification and analysis, it is highly beneficial to combine spectral information with a 3D reconstructed model to a unified four-dimensional (4D) data set (x, y, z, I). Such higher-dimensional optical imaging systems, typically referred to as 4D imagers, have been studied extensively in laboratory settings [29][30][31][32][33][34]. Most previous 4D systems combine one of the HSI and one of the 3D reconstruction techniques mentioned above to achieve 4D imaging.…”