Precision 3D volume measurement of transparent adhesives via spectrally optimized line laser scanning and enhanced centroid extraction

Abstract Accurate 3D volume measurement of transparent adhesives is essential for ensuring dispensing quality and production efficiency in precision manufacturing. We present a robust line laser scanning system enhanced by automatic camera calibration and complementary spectral background optimization (CSBO), which improves 3D reconstruction accuracy by suppressing transmitted light and internal reflections—without complex ray-tracing models. A novel subpixel laser stripe centroid extraction algorithm is further introduced, integrating a candidate point mechanism with a dynamic weighted multi-factor scoring strategy to enhance stability and noise robustness. Experiments show that the proposed centroid extraction method surpasses conventional approaches in precision and interference resistance, while the CSBO method achieves a minimum relative volume error of 1.62% against ground truth, enabling real-time industrial measurement of transparent materials.