Keyphrases
- fourier transform
- frequency domain
- feature extraction
- spatial domain
- image processing
- signal processing
- fourier domain
- fourier analysis
- wavelet transform
- principal component analysis
- power spectrum
- preprocessing
- feature vectors
- power spectral density
- texture features
- discrete fourier transform
- feature space
- polar coordinates
- fast fourier transform
- face recognition
- denoising
- space variant
- radon transform
- pattern classification
- pattern recognition
- frequency spectrum
- fourier descriptors
- feature selection
- high quality
- phase difference
- correlation function