LSST Applications  21.0.0-172-gfb10e10a+18fedfabac,22.0.0+297cba6710,22.0.0+80564b0ff1,22.0.0+8d77f4f51a,22.0.0+a28f4c53b1,22.0.0+dcf3732eb2,22.0.1-1-g7d6de66+2a20fdde0d,22.0.1-1-g8e32f31+297cba6710,22.0.1-1-geca5380+7fa3b7d9b6,22.0.1-12-g44dc1dc+2a20fdde0d,22.0.1-15-g6a90155+515f58c32b,22.0.1-16-g9282f48+790f5f2caa,22.0.1-2-g92698f7+dcf3732eb2,22.0.1-2-ga9b0f51+7fa3b7d9b6,22.0.1-2-gd1925c9+bf4f0e694f,22.0.1-24-g1ad7a390+a9625a72a8,22.0.1-25-g5bf6245+3ad8ecd50b,22.0.1-25-gb120d7b+8b5510f75f,22.0.1-27-g97737f7+2a20fdde0d,22.0.1-32-gf62ce7b1+aa4237961e,22.0.1-4-g0b3f228+2a20fdde0d,22.0.1-4-g243d05b+871c1b8305,22.0.1-4-g3a563be+32dcf1063f,22.0.1-4-g44f2e3d+9e4ab0f4fa,22.0.1-42-gca6935d93+ba5e5ca3eb,22.0.1-5-g15c806e+85460ae5f3,22.0.1-5-g58711c4+611d128589,22.0.1-5-g75bb458+99c117b92f,22.0.1-6-g1c63a23+7fa3b7d9b6,22.0.1-6-g50866e6+84ff5a128b,22.0.1-6-g8d3140d+720564cf76,22.0.1-6-gd805d02+cc5644f571,22.0.1-8-ge5750ce+85460ae5f3,master-g6e05de7fdc+babf819c66,master-g99da0e417a+8d77f4f51a,w.2021.48
LSST Data Management Base Package
Public Member Functions | Static Public Attributes | List of all members
lsst.ip.isr.linearize.LinearizeSpline Class Reference
Inheritance diagram for lsst.ip.isr.linearize.LinearizeSpline:

Public Member Functions

def __call__ (self, image, **kwargs)

Static Public Attributes

string LinearityType = "Spline"

Detailed Description

Correct non-linearity with a spline model.

corrImage = uncorrImage - Spline(coeffs, uncorrImage)


The spline fit calculates a correction as a function of the
expected linear flux term.  Because of this, the correction needs
to be subtracted from the observed flux.

Definition at line 690 of file

Member Function Documentation

◆ __call__()

def lsst.ip.isr.linearize.LinearizeSpline.__call__ (   self,
**  kwargs 
Correct for non-linearity.

image : `lsst.afw.image.Image`
    Image to be corrected
kwargs : `dict`
    Dictionary of parameter keywords:
        Coefficient vector (`list` or `numpy.array`).
        Logger to handle messages (`logging.Logger`).

output : `tuple` [`bool`, `int`]
    If true, a correction was applied successfully.  The
    integer indicates the number of pixels that were
    uncorrectable by being out of range.

Reimplemented from lsst.ip.isr.linearize.LinearizeBase.

Definition at line 705 of file

705  def __call__(self, image, **kwargs):
706  """Correct for non-linearity.
708  Parameters
709  ----------
710  image : `lsst.afw.image.Image`
711  Image to be corrected
712  kwargs : `dict`
713  Dictionary of parameter keywords:
714  ``"coeffs"``
715  Coefficient vector (`list` or `numpy.array`).
716  ``"log"``
717  Logger to handle messages (`logging.Logger`).
719  Returns
720  -------
721  output : `tuple` [`bool`, `int`]
722  If true, a correction was applied successfully. The
723  integer indicates the number of pixels that were
724  uncorrectable by being out of range.
725  """
726  splineCoeff = kwargs['coeffs']
727  centers, values = np.split(splineCoeff, 2)
728  interp = afwMath.makeInterpolate(centers.tolist(), values.tolist(),
729  afwMath.stringToInterpStyle("AKIMA_SPLINE"))
731  ampArr = image.getArray()
732  delta = interp.interpolate(ampArr.flatten())
733  ampArr -= np.array(delta).reshape(ampArr.shape)
735  return True, 0
Interpolate::Style stringToInterpStyle(std::string const &style)
Conversion function to switch a string to an Interpolate::Style.
std::shared_ptr< Interpolate > makeInterpolate(std::vector< double > const &x, std::vector< double > const &y, Interpolate::Style const style=Interpolate::AKIMA_SPLINE)
A factory function to make Interpolate objects.

Member Data Documentation

◆ LinearityType

string lsst.ip.isr.linearize.LinearizeSpline.LinearityType = "Spline"

Definition at line 703 of file

The documentation for this class was generated from the following file: