Abstract
Abstract The spatial characteristics of scanned images of sediment fabrics are analyzed and restructured using Fourier transformations. The resulting pictures are based on the frequency characteristics of the originals described as a series of sinusoidal waves of increasing amplitude and wavelength. Sharp edges and alignments of the sediment grains will result in high frequencies. Other areas in the scanned image, such as the actual grain bodies and pore spaces, induce low frequencies as a result of their uniform gray levels when scanned and transformed. Therefore, orientation of the grains will result in high frequencies perpendicular to their long axes and will transform the original isotropic circular Fourier energy spectrum to an ellipse. Quantification of the shape and size of these ellipses directly represents the anisotropy of the sediment fabrics.
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