The detection of ocean waves can be used to monitor ocean and to forecast wind-storms upon the ocean surface. The paper presents a method for extracting wave direction and wavelength of ocean waves from a sea image. Based on the assumption that the power spectrum of an ocean wave can be thought of as a thin plane consisting of discrete particles, the wave direction is on the axis direction which minimizes the moment of inertia. By finding the maximum amplitude of mean spectrum within a neighborhood along this axis direction, the location of the main wave and its wavelength can be determined immediately. The method is tested on an air photo of the East Sea of China.
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