Estimation of peak wave period from surface texture motion in videos

Haipeng Yu Xiaoliang Chu Guang Yuan

Haipeng Yu, Xiaoliang Chu, Guang Yuan. Estimation of peak wave period from surface texture motion in videos[J]. Acta Oceanologica Sinica, 2024, 43(9): 136-144. doi: 10.1007/s13131-024-2359-y
Citation: Haipeng Yu, Xiaoliang Chu, Guang Yuan. Estimation of peak wave period from surface texture motion in videos[J]. Acta Oceanologica Sinica, 2024, 43(9): 136-144. doi: 10.1007/s13131-024-2359-y

doi: 10.1007/s13131-024-2359-y

Estimation of peak wave period from surface texture motion in videos

Funds: The Key R&D Program of Shandong Province under contract No. 2023CXPT101.
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  • Figure  1.  Sea surface image captured by the video system. The yellow arrow in the figure points to the direction of wave propagation, and the white box indicates the sampling region used to identify the waves. Time in UCT+8.

    Figure  2.  Sub-images of six moments taken from the video. The white dashed ellipse indicates the position of the ripple texture in the image, and the black dashed line serves as a reference baseline for observing the movement of the texture. The textures in the image show upward (a, b, c) and downward (d, e, f) movement as the waves pass by.

    Figure  3.  Flow diagram of video analysis.

    Figure  4.  Schematic of sub-image matching (left) and matching results (right). Lighter grey scale indicates larger values; the black box in the figure indicates the position of the maximum value obtained from the matching process; the red box denotes the center of the image.

    Figure  5.  Texture displacements were derived by matching between every two adjacent frames before and after the wave passes the observation position (upper curve), and continuous texture displacements were obtained by accumulating the displacement data (lower curve).

    Figure  6.  Frame from the video showing three selected regions (A, B, and C) for wave parameter extraction.

    Figure  7.  Texture displacement in Region A.

    Figure  8.  Spectrum of texture displacement in Region A.

    Figure  9.  Wave spectra calculated from buoy motion data.

    Figure  10.  Selected region for assessing the impact of distance.

    Figure  11.  Spectrum derived from texture displacement extracted at a distant location.

    Figure  12.  Relationship between height in the image and real-world height.

    Figure  13.  Sea surface elevation after filtering.

    Figure  14.  Wave spectrum plotted from filtered sea surface elevation.

    Figure  15.  Comparison of texture displacement between 10 pixel × 10 pixel and 20 pixel × 20 pixel.

    Figure  16.  Simulated sea surface video image.

    Figure  17.  Comparison between the peak wave periods calculated from the sub-image sizes ranging from 10 pixel × 10 pixel to 100 pixel × 100 pixel and the theoretical values, under wind speed conditions of 3 m/s, 7 m/s, and 12 m/s.

    Table  1.   Peak wave periods TA, TB, and TC corresponding to Regions A, B, and C in Fig. 6, respectively, along with the radar-derived peak wave period Tradar and the peak wave period Tbuoy extracted from buoy motion, during 16:30 to 16:50 (UCT+8) on July 3, 2021

    TA/sTB/sTC/sTradar/sTbuoy/s
    6.406.525.826.065.70
    下载: 导出CSV

    Table  2.   Comparison of peak wave periods derived from image matching method Timage, radar inversion Tradar, and buoy motion analysis Tbuoy, and the deviations of Timage relative to Tradar (Dradar) and Tbuoy (Dbuoy)

    Date and time (UCT+8) Timage/s Tradar/s Dradar Tbuoy/s Dbuoy
    2021-07-03 08:30–08:50 6.04 6.46 6.5% 6.04 0.0%
    2021-07-03 10:30–10:50 6.01 5.97 0.7% 6.02 0.2%
    2021-07-03 11:30–11:50 5.72 5.96 4.0% 5.34 7.1%
    2021-07-03 12:30–12:50 5.72 6.04 5.3% 6.43 11.0%
    2021-07-03 13:30–13:50 6.18 6.20 0.3% 6.04 2.3%
    2021-07-03 15:30–15:50 6.13 6.20 1.1% 6.04 1.5%
    2021-07-03 18:30–18:50 6.21 5.91 5.1% 6.15 1.0%
    2021-06-02 15:50–16:10 6.21 6.63 6.3% 7.01 11.4%
    2021-06-09 09:50–10:10 6.02 6.12 1.6% 5.50 9.5%
    2021-06-15 15:00–15:20 6.37 6.73 5.3% 6.26 1.8%
    2021-07-04 17:00–17:20 6.39 6.35 0.6% 6.76 5.5%
    下载: 导出CSV

    Table  3.   Peak wave period Tp and significant wave height H1/3 corresponding to pixel sizes from 10 × 10 to 100 × 100 for sub-images

    SizeTp/sH1/3/m
    10 pixel × 10 pixel5.830.92
    20 pixel × 20 pixel6.400.98
    30 pixel × 30 pixel6.400.96
    40 pixel × 40 pixel6.400.93
    50 pixel × 50 pixel6.400.92
    60 pixel × 60 pixel6.400.91
    70 pixel × 70 pixel6.400.89
    80 pixel × 80 pixel6.400.87
    90 pixel × 90 pixel5.900.86
    100 pixel × 100 pixel6.190.84
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-03-19
  • 录用日期:  2024-06-24
  • 网络出版日期:  2024-08-01
  • 刊出日期:  2024-09-01

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