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OriginStack 2.21.0

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@hd152 hd152 released this 02 Nov 20:14
v2.21.0
f8ebeb0
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Image-quality work from a research survey of the whole pipeline: two calibration/denoising repairs
and a per-session dark correction that change results by default, an opt-in Gaia-anchored halo
remover and a PSF-tilt equaliser, and measuring tools. Most gains are modest on sky-noise-limited
Origin data; the numbers below are what was measured.

Changed (results differ from 2.20.0)

  • A single pre-averaged flat is blurred 4 px, not 15. The Origin ships one library flat; the
    n-frame rule treated it as one noisy frame and erased its real pixel-response pattern. On the
    158-frame Sunflower stack 1.8-3.7% less sky structure at 16 px (all 36 comparisons lower).
    Flats of two or more frames are smoothed as before.
  • --denoiser wavelet estimates the noise per band. It used the finest diagonal band's value
    for every band, which is right only for white noise; Origin stacks have correlated noise
    (lag-1 about 0.4), so most of it was left. The default Origin path (the learned denoiser) is
    unaffected.
  • Per-session dark glow scale. A few lights are calibrated and the dark's glow scale is fitted
    on top of the exposure ratio, applied only when it is well determined (it triggers on 3 of 11
    local sessions). Markarian's Chain (19-21 C against a 31 C dark): 10-13% less 32-64 px sky
    structure in the linear stack; the final preview changes by about 2% because background
    extraction absorbs it. --config session_dark_scale=false turns it off. A checkpoint made
    before this version is rebuilt (a Phase 1 setting changed).
  • The wavelet and learned denoisers flatten the noise by the --full-field coverage map
    first (shallow rims are about 1.4x noisier than the one sigma they assume). --from-stack reads
    <stem>_coverage.fits. Stacks of uniform depth are unchanged. --config noise_map_denoise=false
    turns it off.
  • The preview JPEG is dithered (seeded triangular noise, clipped black and white untouched) so
    smooth denoised regions do not band. The PNG exports are unchanged.

Added

  • --halo-removal with --config halo_removal_method=psf: Gaia-anchored extended-PSF halo
    subtraction (flux scale from unsaturated Gaia stars, empirical radial PSF, per-sector cap).
    Pleiades wings at 40 px 16-23 sigma -> 4-8; star cores and a nebula behind a star are untouched.
    Falls back to the Gaussian remover with a note without a WCS or catalogue. Opt-in.
  • --config nn_tilt_equalise=true (with --deconvolve nn): every Origin stack measured has
    star width falling along one sensor axis (left edge 12-55% wider); the network is run once more
    per strip, blended to the sharpest strip's width. Column max/min Omega 1.33 -> 1.07, Pleiades
    1.59 -> 1.08. 15-35 s. Opt-in.
  • --config deconvolve_target_ratio=0.8 (with --deconvolve rl): deconvolve to a narrower
    target PSF instead of a point, so there is nothing to ring; -v prints a consistency check.
  • Frame report and FITS header: a t_eff column (seeing, sky and transparency combined; a
    note under 0.25) and TEFFTIME / TEFFRATIO keys: the integration time in median-quality
    seconds.
  • --noise-validate also prints the finest detail the stack repeatably holds (Fourier ring
    correlation of the odd/even halves) and the SNR by spatial period.
  • Tools: tools/bench_lsb_injection.py (inject faint extended light, report how much survives
    Phase 4, plus blank-sky aperture curves), tools/eval_frc.py, tools/psf_census.py,
    tools/stack_optics_census.py.
  • Off by default, kept for experiments: --config bg_wing_mask=true (brightness-scaled star masks
    for background sampling; changed the preview by 0.1/255 on three real stacks) and
    --config wavelet_cycle_spins=4 (4-7% less noise on synthetic scenes, 0.3% on real data).

Fixed

  • --halo-removal ran with a NaN star width on --from-stack.
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