New rotationally invariant texture feature extraction methods are introduced that utilise the dual tree complex wavelet transform (DT-CWT). The complex wavelet transform is a new technique that uses a dual tree of wavelet filters to obtain the real and imaginary parts of complex wavelet coefficients. When applied in two dimensions the DT-CWT produces shift invariant orientated subbands. Both isotropic and anisotropic rotationally invariant features can be extracted from the energies of these subbands. Using simple minimum distance classifiers, the classification performance of the proposed feature extraction methods were tested with rotated sample textures. The anisotropic features gave the best classification results for the rotated texture tests, outperforming a similar method using a real wavelet decomposition.
The method which uses a combination of dual tree rotated complex wavelet filter and DT-CWT was proposed by the authors in REF .
Rotationally invariant texture features using the dual-tree complex wavelet transform
Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101)
Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101)
Mathematics Computer Science