Wavelets (Mathematics) Mathematics 3 Transformations (Mathematics) 3 Fourier analysis 2 Signal processing 2 Applied mathematics 1 Civil & Environmental Engineering 1 Computer and Information Science 1 Data encryption (Computer science) 1 Differential equations, Elliptic 1 Digital images 1 Engineering & Applied Sciences 1 Engineering and Technology 1 Harmonic analysis 1 Image compression 1 Image processing 1 Machine learning 1 Mathematical modelling 1 Numerical Analysis and Scientific Computing 1 Operations Research 1 Physical Sciences 1 Signal Processing 1 Wavelets 1 harmonic analysis 1 special functions 1 spherical harmonics 1 zonal functions 1