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    • 3. 发明申请
    • Method for measuring water depths using visible images of shoaling ocean waves
    • 使用海洋波浪的可见图像测量水深的方法
    • US20070242884A1
    • 2007-10-18
    • US10202617
    • 2002-07-23
    • John DuganCynthia Piotrowski
    • John DuganCynthia Piotrowski
    • G06K9/46
    • G06K9/0063G01C13/008
    • To estimate water depth, photos of shoaling ocean waves are analyzed in view of primary wave frequency and length, mean water level, and known error sources. Primary wave frequency and mean water level are found from independent surface-wave and tide-level hindcasting systems for the time and place of the photos. Primary wave length is calculated from the two-dimensional Fourier transform for various subregion sizes and maximizing the peak value as a function of subregion size. Error is reduced by analysis of the above parameters and also the noise of higher-frequency wind waves and other image artifacts such as fronts and slicks. Error residuals are reduced through statistical analysis, again using independent images. Robustness is significantly enhanced by collecting images on different days.
    • 为了估算水深,考虑到主波频率和长度,平均水位和已知误差源,分析了海浪的照片。 主要波频率和平均水位是根据照片的时间和地点从独立的地面波浪和潮汐级后期播放系统中找到的。 从针对各种子区域尺寸的二维傅立叶变换计算主波长,并且将峰值最大化作为子区域大小的函数。 通过分析上述参数以及较高频风波和其他图像伪像(如前沿和光滑)的噪声可以减少误差。 通过统计分析减少误差残差,再次使用独立图像。 通过在不同的日子收集图像显着增强了鲁棒性。