InterpImageTask

class lsst.pipe.tasks.interpImage.InterpImageTask(config: Config | None = None, *, name: str | None = None, parentTask: Task | None = None, log: logging.Logger | lsst.utils.logging.LsstLogAdapter | None = None)

Bases: Task

Interpolate over bad image pixels

Methods Summary

interpolateImage(maskedImage, psf, ...)	Interpolate over defects in an image
run(image[, planeName, fwhmPixels, defects])	Interpolate in place over pixels in a maskedImage marked as bad
transposeContext(maskedImage, defects)	Context manager to potentially transpose an image

Methods Documentation

interpolateImage(maskedImage, psf, defectList, fallbackValue)

Interpolate over defects in an image

Parameters

maskedImagelsst.afw.image.MaskedImage

Image on which to perform interpolation.

psflsst.afw.detection.Psf

Point-spread function; currently unused.

defectListlsst.meas.algorithms.Defects

List of defects to interpolate over.

fallbackValuefloat

Value to set when interpolation fails.

run(image, planeName=None, fwhmPixels=None, defects=None)

Interpolate in place over pixels in a maskedImage marked as bad

Pixels to be interpolated are set by either a mask planeName provided by the caller OR a defects list of type Defects If both are provided an exception is raised.

Note that the interpolation code in meas_algorithms currently doesn’t use the input PSF (though it’s a required argument), so it’s not important to set the input PSF parameters exactly. This PSF is set here as the psf attached to the “image” (i.e if the image passed in is an Exposure). Otherwise, a psf model is created using measAlg.GaussianPsfFactory with the value of fwhmPixels (the value passed in by the caller, or the default defaultFwhm set in measAlg.GaussianPsfFactory if None).

Parameters

imagelsst.afw.image.MaskedImage or lsst.afw.image.exposure.Exposure

MaskedImage OR Exposure to be interpolated.

planeNamestr, optional

Name of mask plane over which to interpolate. If None, must provide a defects list.

fwhmPixelsint, optional

FWHM of core star (pixels). If None the default is used, where the default is set to the exposure psf if available.

defectslsst.meas.algorithms.Defects, optional

List of defects of type ipIsr.Defects over which to interpolate.

transposeContext(maskedImage, defects)

Context manager to potentially transpose an image

This applies the transpose configuration setting.

Transposing the image allows us to interpolate along columns instead of rows, which is useful when the saturation trails are typically oriented along rows on the warped/coadded images, instead of along columns as they typically are in raw CCD images.

Parameters

maskedImagelsst.afw.image.MaskedImage

Image on which to perform interpolation.

defectslsst.meas.algorithms.Defects

List of defects to interpolate over.

Yields

useImagelsst.afw.image.MaskedImage

Image to use for interpolation; it may have been transposed.

useDefectslsst.meas.algorithms.Defects

List of defects to use for interpolation; they may have been transposed.