The first stage was achieved by training the images for detection and extraction which was done using discrete cosine transform (DCT) and Haar wavelet based
discrete wavelet transform (DWT), the second stage was achieved also using discrete firefly algorithm (DFA) for feature selection, and finally the last stage involves using nearest neighbor classifier (NNC) for the classification of the images.
Zouzou, "Induction motors airgap-eccentricity detection through the
discrete wavelet transform of the apparent power signal under non-stationary operating conditions", ISA Trans., vol.
Khoo, "Robust blind image watermarking scheme based on redundant
discrete wavelet transform and singular value decomposition," AEU--International Journal of Electronics and Communications, vol.
Majhi, "Brain MR image classification using two-dimensional
discrete wavelet transform and AdaBoost with random forests," Neurocomputing, vol.
Discrete Wavelet Transform. Wavelet transform includes continuous wavelet transform and
discrete wavelet transform.
Discrete wavelet transform (DWT) was performed on the data.
In the case of a
discrete wavelet transform (DWT) which is the tool of our paper work, the expansion and translation parameters "a" and "b" of [psi](t) are limited only to discrete values leading to the following expression:
The various transforms are discrete cosine transform (DCT),
discrete wavelet transform (DWT), Hadamard transform, dual-tree DWT, double density dual-tree DWT (DD DT DWT), ridgelet transform, curvelet transform, and so on.
As in the case of FT, the WT has been discretized and is known as a
discrete wavelet transform (DWT) and represents an important advantage over traditional FT methods.