Frequency Research

Frequency extraction uses a deterministic separable discrete Fourier transform with a Hann window, no padding, and unit-energy summaries. It reports band ratios, centroid, spread, entropy, dominant peak, prominence, periodicity, horizontal/vertical energy, grid evidence, and a multi-scale summary.

These descriptors are experimental image statistics. They do not identify whether an object is natural or manufactured without validation against held-out human ground truth.