Inverse Triangulation with Spatiotemporal Correlation using a Variable Pseudorandom Pattern Projector for 3D Stereo Measurement

Daniel Regner, João Facco, Moacir Wendhausen, Alice Bilbao, Tiago Loureiro Figaro da Costa Pinto, Armando Albertazzi G. Jr.

Abstract

In this paper, we propose an innovative 3D reconstruction approach based on stereo vision that combines inverse triangulation with a spatiotemporal correlation algorithm. The inverse triangulation technique enables the correspondence search to be performed systematically in the object space, using a structured 3D grid centered on each point of interest (X, Y, Z). These 3D points are projected onto the image planes, and subpixel-interpolated intensities are extracted from a sequence of temporal images to compute the correlation values. For each (X, Y) tuple, the Z value is determined by the correlation peak. The images capture a pseudo-random laser pattern that changes over time. The proposed approach is intended for future applications in the underwater inspection of offshore structures in the oil and gas industry.

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IMEKO-TC2-2025-012.pdf

DOI

10.21014/tc2-2025.012

IMEKO TC

TC2 - Photonics

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