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By MathWorks. MATLAB documentation, fft2: 2-D fast Fourier transform. Online documentation inspected 24 October 2026; displayed release R2026b.

Cited passage: More About, 2-D Fourier Transform, defining double sum and roots of unity. Companion inverse definition: More About, 2-D Inverse Fourier Transform.

Official Computer Vision Toolbox explanation of correspondence, calibration and disparity-to-depth geometry.