Spatial and frequency domain techniques for segmentation of Placido images and accuracy implications for videokeratography.
Luis Alberto Vieira de CarvalhoOdemir Martinez BrunoPublished in: Comput. Methods Programs Biomed. (2005)
Keyphrases
- frequency domain
- cross correlation
- power spectrum
- log polar
- fourier domain
- spatial domain
- spectral domain
- segmentation method
- segmentation algorithm
- power spectra
- fourier transform
- subpixel accuracy
- input image
- image analysis
- fourier analysis
- edge detection
- segmented images
- phase correlation
- spatial information
- multiscale
- directional filtering
- affine invariance
- denoising
- bandpass
- pixel wise
- spectral signatures
- low frequency
- object recognition
- image data
- discrete fourier transform
- subband
- image filtering
- low pass
- grey level
- feature extraction
- feature points
- image matching
- image registration
- wavelet transform
- spectrum analysis
- template matching