leonarski_f
929e6e1fa0
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The per-direction peak search took argmax|spec|. The projected-spot histogram has a broad low-frequency ENVELOPE (spots cluster near the origin) whose magnitude can exceed the true lattice peaks, so on weak / pink-beam frames every direction reported a short envelope vector (~10 A) and the real 38-79 A axes never surfaced -> 0 candidate cells -> 0% indexing. (Diagnosed on the lyso jet: the FFT returned only 10-15 A vectors, the true axes entirely absent.) Subtract a running-mean background of half-width ~15 A and pick the peak by its PROMINENCE (mag - background) instead. The smooth envelope cancels to ~0 while sharp lattice peaks - fundamentals and harmonics alike - keep their height, so the real axes win. The prominence is also reported as the magnitude, so FilterFFTResults ranks directions by real-peak strength rather than envelope. Ported identically to CPU (prefix-sum window) and GPU (sliding-window in the kernel). Validation (lyso, de-novo): jet FFT 0% -> 20.5% (CPU and GPU identical; vs FFBIDX 27%); crystal 2 95.3% -> 95.5% (no regression, CC1/2 95.8 / CCref 92.7 unchanged). The ~15 A window is the validated optimum (wider over-smooths, narrower under-removes the envelope). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>