Quantification of non-homogeneity from ocean remote-sensing images using two-dimensional continuous wavelet transforms |
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| Authors: | Li-Chung Wu Dong-Jiing Doong Chia Chuen Kao |
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| Affiliation: | 1. Department of Hydraulic and Ocean Engineering , National Cheng Kung University , Taiwan, ROC;2. Department of Marine Environmental Informatics , National Taiwan Ocean University , Taiwan, ROC |
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| Abstract: | In this study, a two-dimensional continuous wavelet transform is applied to quantify the non-homogeneity from remote-sensing wave images. Our study shows that the non-homogeneity index, which is proposed here, is capable of identifying the degree of non-homogeneity from the wave-field images. However, the influence from the edges of the wave-field image should be considered in analysis. The calculated results from the simulated wave fields and from the natural wave-field images reveal that the non-homogeneity index is influenced by the bathymetry inside the area of the ocean-wave image. It conforms to the character of the natural wave non-homogeneity. After discussing the wave characteristics from the wave-field image with a high non-homogeneity index, an inhomogeneous algorithm is recommended for obtaining accurate and reasonable wave results from the wave image. |
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