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References in periodicals archive ?
Fourier Descriptor. Shape is one of the most important visual features of a target.
Fourier descriptor is also used again in order to collect an information about the changes in shapes.
Polygonal approximation, Fourier descriptors [2, 3], wavelet descriptors, scale space [4, 5], and so forth.
What we have done was using elliptic Fourier descriptors (EFDs) [5] to analyse the data in the frequency domain, instead of the spatial domain.
Each harmonic is described by four Fourier coefficients (elliptical Fourier descriptors, EFDs), two each for the x-and y-axes, generating a total of 4n coefficients labeled an, bn, cn, and dn, where n is the number of harmonics (Crampton, 1995).
The representations used are color histogram and color moments (Swain & Ballard, 1991), for the color feature Tamura (Tamura et al., 1978; Equitz & Niblack, 1994), and co-occurrence matrix (Haralick et al., 1973; Ohanian & Dubes, 1992) texture representations for the texture feature, and Fourier descriptor and chamfer shape descriptor (Rui et al., 1997b) for the shape feature.
This means that, for each four-bar linkage, one set of Fourier descriptors can be used to tag all its coupler curves.
For trajectories, the three descriptors residing with long-term trajectories are 1) the point-level context (SIFT average descriptor), 2) trajectory motion context (orientation and magnitude), and 3) shape context (Fourier descriptors).
Quantitative evaluation of common buckwheat (Fagopyrum esculentum Moench) kernel shape by elliptic Fourier descriptor. Euphytica, 101: 175-183
For sequence matching, we implemented various matching methods including curvature scale space (CSS) [22], RI-PDTW, Fourier descriptor, and Euclidean distance matching.