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3-D Reconstruction of Bubble Flow Field Based on the Method of Multivision by Rough-Precise Location Algebraic Reconstruction Technique

To acquire the distribution of gas–liquid two-phase flow accurately, 3-D reconstruction method of bubble flow field with multiview cameras was studied in this work. Three cameras were employed to take bubble images from different angles, and the three-camera stereo calibration method is proposed to obtain the mapping relationship between bubble flow field and projection image. Then, an improved technique named rough-precise location algebraic reconstruction technique (ART) based on multiview images was developed to reconstruct the bubble flow field. The calibration result is used for rough location of bubbles and the ART is employed for precise location. Based on the simulation experiment, the mean Intersection-over-Union of the proposed method is 93.84% and the mean reconstruction time is 0.081 s/voxel, which are faster and more accuracy than traditional ART. The reconstruction experiments of bubble flow field have illustrated that the proposed method is of less noise and more accurate than the parallax method. Meanwhile, the proposed method solves the bubble overlapping problem to some extent.