aug_wavelength_shift — Rigid wavelength-axis shift¶
Group: Augmentation · C ABI: n4m_augmentation_wavelength_shift_*
Description¶
Random spectral shift with linear interpolation.
Parameters¶
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API and bindings¶
C ABI (ABI 2): n4m_augmentation_wavelength_shift_apply · n4m_augmentation_wavelength_shift_create · n4m_augmentation_wavelength_shift_destroy. Use the linked public header for the exact signature, configuration, and result handles.
Python (verified public re-export):
from n4m.augmentation.wavelength import WavelengthShift
Source signature: WavelengthShift(shift_lo: float = -1.0, shift_hi: float = 1.0, wavelengths = None, rng: Optional[PCG64] = None, seed: int = 0).
R: no current source-verified entry point was found for this catalog method.
MATLAB / Octave: no current source-verified entry point was found for this catalog method.
Explanations¶
Bibliographic source¶
No unique paper defines this interpolation augmenter. It is an internal model of wavelength-registration uncertainty.
Mathematical principle¶
For each spectrum draw \(s_i\sim U(\text{shift_lo},\text{shift_hi})\) and evaluate \(X'_i(\lambda_j)=X_i(\lambda_j-s_i)\) by linear interpolation. Outside the measured interval, endpoint values are held as in numpy.interp.
Appropriate uses¶
Robustness to small calibration offsets in the wavelength axis.
Limits and validation¶
Interpolation smooths sharp features and clamps beyond the endpoints. If no wavelength array is supplied, shift units are channel indices rather than nm.
Implementation¶
Python role API n4m.augmentation.wavelength.WavelengthShift; ABI 2 family n4m_augmentation_wavelength_shift_{create,apply,destroy}.
The ABI-2 implementation is the n4m_augmentation_wavelength_shift_* lifecycle in libn4m.
Sources and provenance¶
See also: methods index · interactive dashboard