“Window” Fourier transform

∑-△ transform

∑-△transform

∑-Δ transform

2 dimensional discrete wavelet transform

2-D Arithmetic Fourier Transform

2D continuous wavelet transform

2D discrete cosine transform

2D discrete wavelet transform

2-D discrete wavelet transform

2D Fourier transform

2-D Fourier transform

2D Gabor wavelet transform

2-D Hilbert-Huang transform

2D Hough transform

2D hybrid transform

2-D Radon transform

2D Separable Wavelet transform

2-D stationary wavelet transform

2-D transform-domain