Computation of Wind Wave Flow Field with Moving Boundary Based on Image Processing

• Published in: Tehnički vjesnik Vol. 28; no. 4; pp. 1075 - 1081
• Main Authors: Fang, Yajun, Yu, Chuanqi, Wang, Xihua, Zheng, Jun
• Format: Journal Article
• Language: English
• Published: Slavonski Baod University of Osijek 01-08-2021; Josipa Jurja Strossmayer University of Osijek; Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
• Subjects: flow field; image filtering; Image filters; Image processing; Image segmentation; Interference; invariant background; Invariants; Mathematical analysis; morphology; moving boundary; Target recognition; Wind waves; China
• ISSN: 1330-3651; 1848-6339
• DOI: 10.17559/TV-20210401114628

Based on image processing technology, a solution to the interference of moving boundary in wind wave flow field calculation is proposed. Invariant background is extracted from image sequence by means of the minimum method, and the differences between image sequence and invariant background image are used to remove the invariant background of image sequence. The image segmentation threshold is determined based on maximum interclass variance method, and the scatter interference is removed by image filtering and morphological technology, to obtain the target image. Then the flow field is calculated by PIV technology and the results of the flow field before and after the boundary treatment are compared. The experimental results show that the accuracy and speed of flow field calculation are greatly improved after removal of moving boundary disturbance, and the results of wind wave flow field calculation accord with the motion mechanism of hydraulic wind wave.