Democratizing three-dimensional surface phenotyping: an open structured-light platform reveals and removes the projection bias in biological imaging
- 1Friedrich Schiller University Jena
Abstract
Surface phenotyping underpins plant science, preclinical animal research and entomology, yet across all three the measurement is almost always a photograph, which records a projection and not the surface itself. Here we present the Gentschinator3000, an open structured-light platform that brings high-end metric surface measurement within reach of laboratories with no optics expertise, combining documented open hardware, open reconstruction software and analysis workflows for under 4000 Euro in components. It resolves a planar reference to 45 m local flatness, registers full rotations to a loop closure of 156 m, and performs stably across acquisition ranges that we define. Applying one workflow to a leaf before and after desiccation, to murine anatomy and to a spread lepidopteran, we find that projection underestimates surface area by 11 to 41 %. That error grows with the condition under study, with the evaluation scale and with the direction of view, so it can confound phenotype comparisons dramatically. In murine limbs a 15-degree change of viewing direction shifts a projected inter-segment angle by up to 23.2 degrees, while the three-dimensional angle does not move. Projection geometry can therefore contribute as much to a measured phenotype as the biology it is meant to quantify.
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BibTeX
@misc{gentsch2026democratizing,
title = {{Democratizing three-dimensional surface phenotyping: an open structured-light platform reveals and removes the projection bias in biological imaging}},
author = {G. J. Gentsch and M. Guo and A. Platz and G. Brehm and J. C. Hennings and C. A. Huebner and A. W. Stark and C. Franke},
howpublished = {bioRxiv},
year = {2026},
month = aug,
doi = {10.64898/2026.08.30.748077},
url = {https://www.biorxiv.org/content/10.64898/2026.08.30.748077v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Democratizing three-dimensional surface phenotyping: an open structured-light platform reveals and removes the projection bias in biological imaging
AU - G. J. Gentsch
AU - M. Guo
AU - A. Platz
AU - G. Brehm
AU - J. C. Hennings
AU - C. A. Huebner
AU - A. W. Stark
AU - C. Franke
PY - 2026
DA - 2026/08/30
PB - bioRxiv
DO - 10.64898/2026.08.30.748077
UR - https://www.biorxiv.org/content/10.64898/2026.08.30.748077v1
AB - Surface phenotyping underpins plant science, preclinical animal research and entomology, yet across all three the measurement is almost always a photograph, which records a projection and not the surface itself. Here we present the Gentschinator3000, an open structured-light platform that brings high-end metric surface measurement within reach of laboratories with no optics expertise, combining documented open hardware, open reconstruction software and analysis workflows for under 4000 Euro in components. It resolves a planar reference to 45 m local flatness, registers full rotations to a loop closure of 156 m, and performs stably across acquisition ranges that we define. Applying one workflow to a leaf before and after desiccation, to murine anatomy and to a spread lepidopteran, we find that projection underestimates surface area by 11 to 41 %. That error grows with the condition under study, with the evaluation scale and with the direction of view, so it can confound phenotype comparisons dramatically. In murine limbs a 15-degree change of viewing direction shifts a projected inter-segment angle by up to 23.2 degrees, while the three-dimensional angle does not move. Projection geometry can therefore contribute as much to a measured phenotype as the biology it is meant to quantify.
ER -