wavelet transformation
DjVu format uses wavelet-based IW44 algorithm for image compression ECW, a wavelet-based geospatial image format designed for speed and processing efficiency JPEG 2000, a wavelet-based image compression standard MrSID, the image format developed from original wavelet compression research at Los Alamos National Laboratory (LANL) Scaleograms, a type of spectrogram generated using wavelets instead of a short-time Fourier transform