qrunch.tools.minimizers.fft_utils

Utilities for 2D Fourier coefficient recovery and optimization.

This module provides helper functions for working with bivariate trigonometric polynomials, including:

• Wrapping angles to the interval [0, 2π).

• Recovering Fourier coefficients from a 5x5 grid using a 2D DFT.

• Constructing cost and gradient functions from Fourier coefficients.

• Sampling functions on uniform grids.

• Performing FFT-based dense seeding and refinement for optimization.

• Embedding quadrants for zero-padded inverse FFT.