Mr. Evgeny Ippolitov Profile

Evgeny Ippolitov

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Publications (2)

Proceedings Article | 20 June 2021 Presentation + Paper

Deep learning for 3D scene reconstruction and segmentation from stereo images

Vladimir Kniaz, Vladimir Knyaz, Evgeny Ippolitov, Mikhail Novikov, Lev Grodzitsky, Petr Moshkantsev

Proceedings Volume 11785, 117850I (2021) https://doi.org/10.1117/12.2592648

KEYWORDS: 3D modeling, Image segmentation, 3D image processing, 3D image reconstruction, Visual process modeling, Systems modeling, 3D metrology, Performance modeling, Clouds, Neural networks

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Proceedings Article | 20 June 2021 Presentation + Paper

Accuracy assessment of optical 3D measurements in hydrodynamic tunnel

Vladimir Knyaz, Evgeny Ippolitov, Mikhail Novikov

Proceedings Volume 11782, 117821G (2021) https://doi.org/10.1117/12.2592622

KEYWORDS: Calibration, 3D metrology, Environmental sensing, Accuracy assessment, Interfaces, Imaging systems, Cameras, 3D modeling, Singular optics, Refraction

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Hydrodynamic tunnel is an effective mean for studying wing flow process in aerodynamics and hydrodynamics. It allows to study flow characteristics in controlled conditions and to model the conditions that could not be studied in real flight, such as aerodynamic characteristics at critical angles of attack, in icing conditions etc. Techniques for flow visualisation such as coloured jets or small particles allow to have a qualitative data about flow behaviour, being the valuable means for understanding flow behaviour. But it is more important to have quantitative characteristics of the flow allowing to predict the process evolution and to develop safety measures and recommendations. The presented study addresses to developing a system for optical 3D measurements in hydrodynamic tunnel basing on photogrammetric techniques. To provide accurate measurements in condition of two optical media interfaces (air-glass and air-liquid) the accurate model of image formation accounting refraction is developed. The developed photogrammetric system includes several high speed cameras (from 2 to 4 cameras) mounted in a fixed position relatively the working space and a structured light projector. Original technique is applied for the system calibration. Two metrics has been used as a measure of the accuracy of the calibration: the first one being based on the test field points measurements, and the second one using points-to points distance for the surfaces of a reference object. The key contributions of this paper are: (1) accurate model of image formation in case of several media interfaces (2) a technique for photogrammetric system calibration for 3D measurements in hydrodynamic tunnel (3) experimental evaluation of calibration accuracy for multi-media 3D measurements. The performed experimental evaluation of the developed photogrammetric system has proved high accuracy of system calibration and optical 3D measurements in multi-media optical environment. The developed technique for photogrammetric system calibration and 3D measurements demonstrated applicability for the task of 3D flow analysis in hydrodynamic tunnel.

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