mx/Jungfraujoch
3
2 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 88 Wiki Activity

Stills integration: background ring reach measured on empty apertures, radial curvature from the whole frame

Browse Source 
Two changes to the stills integration background, both stills-only (rotation keeps its path bit for bit):

1. The r2..r3 background ring's outer radius is measured per run. The pre-scan lays apertures on a
   grid over its frames, away from every found spot, and for each candidate r3 (r2+2 .. 14) takes the
   mean square difference between the r1 disk mean and the clipped ring mean. With nothing in the
   aperture that is exactly the background error the ring makes (noise + bias); the run keeps the
   minimum. On a photon-counting pixel detector the noise wins and the shipped r3=14 is kept; on a
   binned CCD the background structure wins and the narrowest ring is taken. r1 stays 6: a smaller
   disk (4,6,14) costs 0.0013 dimple R_free on a JUNGFRAU set, so it does not pass the
   photon-counting gate. --adaptive-integration-radius now defaults on for stills too (=off restores
   the fixed 6/8/14). The pre-scan bandwidth estimate is not applied to stills.

2. The radial background-curvature correction on stills takes its curve from the adaptive spot
   finder's peak-excluded per-ring background (whole frame) instead of the predicted reflections'
   own ring pixels, and auto applies it to every stills image (no ice-score gate: a solvent/carrier
   hump curves the background as much as ice). New engine call RadialBackgroundFromRings; CPU, GPU
   and Metal read the handed-over curve. The GPU box sum now sizes the radial bin index separately
   from accumulating, so a handed-over curve is read at the right radius.

Measured (dimple R_free, deposited free set, battery arguments, all frames unless noted):
  pal86  (Rayonix 4x4, 156 um): 0.354 -> 0.218   (ring 10; at 4,6,10 0.213)
  lcls222 (Rayonix 4x4, 177 um): 0.205 -> 0.196  (ring 10)
  sacla236 (MPCCD): 0.2588 -> 0.2558             (ring 11)
  alvra213_int16 (JUNGFRAU): 0.1986 -> 0.1986    (ring 14, unchanged)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
This commit is contained in:
leonarski_fandClaude Opus 5.5 committed 2026-10-21 18:10:08 +02:00
1 parent 987e812e23
commit e8145d8d2f
17 files changed
+558 -42
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

image_analysis/bragg_integration/BraggIntegrationEngineCPU.cpp
+7 -3
View File
@@ -311,7 +311,7 @@ std::vector<Reflection> BraggIntegrationEngineCPU::RunImpl(const Sampler &img,
if (px <= thr) {
clip.sum += px;
++clip.n;
if (bkg_radial) {
if (bkg_radial && radial_curve.empty()) {
// The radial curve is binned on the TRUE detector radius, so the
// offset here is the unshrunk radial projection.
const int b = std::clamp(static_cast<int>(std::lround(st.r0 + rad)), 0, a.n_rad - 1);
@@ -335,7 +335,7 @@ BraggIntegrationEngineCPU::PassA BraggIntegrationEngineCPU::StartPassA(size_t np
const float by0 = static_cast<float>(plane_bounds.y0), by1 = static_cast<float>(plane_bounds.y1);
a.n_rad = static_cast<int>(std::ceil(std::hypot(std::max<double>(beam_x - bx0, bx1 - beam_x),
std::max<double>(beam_y - by0, by1 - beam_y)))) + 2;
if (bkg_radial) {
if (bkg_radial && radial_curve.empty()) {
a.rad_sum.assign(a.n_rad, 0);
a.rad_cnt.assign(a.n_rad, 0);
}
@@ -612,7 +612,11 @@ std::vector<Reflection> BraggIntegrationEngineCPU::ProfilePasses(const Sampler &
double corr = 0.0;
for (int k = 0; k < k_len; ++k) {
const int b = std::clamp(rh.r_bin + k - k_off, 0, a.n_rad - 1);
const double v = a.rad_cnt[b] > 0 ? static_cast<double>(a.rad_sum[b]) / a.rad_cnt[b] : rh.bkg;
double v;
if (!radial_curve.empty())
v = radial_curve[b];
else
v = a.rad_cnt[b] > 0 ? static_cast<double>(a.rad_sum[b]) / a.rad_cnt[b] : rh.bkg;
corr += static_cast<double>(kern[k]) * v;
}
rh.bkg -= corr; // annulus mean -> mean over the signal disk