A sea surface motion field inversion method based on sea surface temperature time series images

By constructing masks, calculating weights and time derivatives, the problems of large-scale background interference and uneven time intervals in sea surface temperature images are solved, achieving high-precision and stable sea surface motion field inversion. It is particularly suitable for complex nearshore and strait areas and can output a variety of business results.

CN122200416BActive Publication Date: 2026-07-21NANJING UNIV OF INFORMATION SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF INFORMATION SCI & TECH
Filing Date
2026-05-15
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing methods for inverting sea surface motion fields based on sea surface temperature time-series images suffer from problems such as large-scale background gradient interference, difficulty in tracking weak texture regions, distortion of time derivatives due to uneven time intervals, impact of edges and invalid regions on inversion stability, and lack of quantitative zoning analysis capabilities for nearshore waters.

Method used

By constructing effective seawater masks, land masks, and other coded masks, high-pass residual images are obtained and texture weights and edge attenuation weights are calculated. The center difference time derivative of three frames is combined with the real time span. The motion vector field is obtained using a dense motion estimation model, and quality evaluation and feedback adjustment are performed. Finally, nearshore and offshore areas are divided for velocity statistics.

Benefits of technology

It improves the accuracy and stability of sea surface motion field inversion, adapts to complex time-series conditions, outputs velocity field images and quantitative statistical tables, and is applicable to nearshore and strait areas with severe cloud obscuration and complex land-sea boundaries, thus enhancing the interpretability and applicability of the results.

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Abstract

The application discloses a kind of sea surface movement field inversion methods based on sea surface temperature time series image, comprising: obtaining multi-temporal sea surface temperature image and carrying out time de-duplication;Effective seawater mask, land mask and other coding type are constructed;Through high-pass residual enhancement, highlight sea temperature fine structure;Joint texture weight and edge attenuation weight are constructed to build joint weight field;Based on real time span, calculate three frame center difference time derivative;Geographical velocity is converted by using dense motion estimation model to solve pixel velocity;Through multi-step forward consistency quality evaluation, the inversion result is optimized.The application effectively solves the technical problems of large-scale background interference, uneven time interval, edge leakage and weak texture instability, significantly improves the precision, stability and practicability of sea surface movement field inversion, and is especially suitable for cloud cover serious, complex land-sea boundary, time series irregular nearshore and strait area.
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