lsst.ip.diffim¶
The lsst.ip.diffim module provides algorithms for astronomical image differencing.
Contributing¶
lsst.ip.diffim is developed at https://github.com/lsst/ip_diffim.
You can find Jira issues for this module under the ip_diffim component.
Task reference¶
Tasks¶
- FractionDiaSourcesToSciSourcesMetricTask
- Task that computes the ratio of difference image sources to science sources in an image, visit, etc.
- NumberSciSourcesMetricTask
- Task that computes the number of cataloged science sources.
Configurations¶
No topics.
Python API reference¶
lsst.ip.diffim Package¶
Functions¶
applyDcr(image, dcr[, useInverse, …]) |
Shift an image along the X and Y directions. |
backgroundSubtract(config, maskedImages) |
Subtract the background from masked images. |
calculateDcr(visitInfo, wcs, filterInfo, …) |
Calculate the shift in pixels of an exposure due to DCR. |
calculateImageParallacticAngle(visitInfo, wcs) |
Calculate the total sky rotation angle of an exposure. |
convolveAndSubtract(*args, **kwargs) |
Overloaded function. |
generateAlardLuptonBasisList(config[, …]) |
Generate an Alard-Lupton kernel basis list based upon the Config and the input FWHM of the science and template images. |
makeAlardLuptonBasisList(halfWidth, nGauss, …) |
|
makeAssessSpatialKernelVisitor(…) |
|
makeBuildSingleKernelVisitor(*args, **kwargs) |
Overloaded function. |
makeBuildSpatialKernelVisitor(basisList, …) |
|
makeCentralDifferenceMatrix(width, height, …) |
|
makeDeltaFunctionBasisList(width, height) |
|
makeForwardDifferenceMatrix(width, height, …) |
|
makeKernelBasisList(config[, targetFwhmPix, …]) |
Generate the delta function or Alard-Lupton kernel bases depending on the Config. |
makeKernelCandidate(*args, **kwargs) |
Overloaded function. |
makeKernelPcaVisitor(imagePca) |
|
makeKernelSumVisitor(policy) |
|
makeRegularizationMatrix(policy) |
|
renormalizeKernelList(kernelListIn) |
|
sourceToFootprintList(candidateInList, …) |
Convert a list of sources for the PSF-matching Kernel to Footprints. |
writeKernelCellSet(kernelCellSet, …) |
TODO: DM-17458 |
Classes¶
AssessSpatialKernelVisitorF |
|
BuildSingleKernelVisitorF |
|
BuildSpatialKernelVisitorF |
|
ClassificationDipoleConfig |
Configuration for classification of detected diaSources as dipole or not |
ClassificationDipolePlugin(config, name, …) |
A plugin to classify whether a diaSource is a dipole. |
DcrModel(modelImages[, filterInfo, psf, …]) |
A model of the true sky after correcting chromatic effects. |
DecorrelateALKernelConfig |
Configuration parameters for the DecorrelateALKernelTask |
DecorrelateALKernelMapReduceConfig |
Configuration parameters for the ImageMapReduceTask to direct it to use DecorrelateALKernelMapper as its mapper for A&L decorrelation. |
DecorrelateALKernelMapper(*args, **kwargs) |
Task to be used as an ImageMapper for performing A&L decorrelation on subimages on a grid across a A&L difference image. |
DecorrelateALKernelSpatialConfig |
Configuration parameters for the DecorrelateALKernelSpatialTask. |
DecorrelateALKernelSpatialTask(*args, **kwargs) |
Decorrelate the effect of convolution by Alard-Lupton matching kernel in image difference |
DecorrelateALKernelTask(*args, **kwargs) |
Decorrelate the effect of convolution by Alard-Lupton matching kernel in image difference |
DetectionConfig |
Configuration for detecting sources on images for building a PSF-matching kernel |
DiaCatalogSourceSelectorConfig |
|
DiaCatalogSourceSelectorTask(**kwargs) |
A task that selects sources for Kernel candidates. |
DiaSourceAnalyst(config) |
|
DiaSourceAnalystConfig |
|
DipoleAnalysis() |
Functor class that provides (S/N, position, orientation) of measured dipoles |
DipoleCentroidControl |
|
DipoleDeblender() |
Functor to deblend a source as a dipole, and return a new source with deblended footprints. |
DipoleFitAlgorithm(diffim[, posImage, negImage]) |
Fit a dipole model using an image difference. |
DipoleFitPlugin(config, name, schema, metadata) |
A single frame measurement plugin that fits dipoles to all merged (two-peak) diaSources. |
DipoleFitPluginConfig |
Configuration for DipoleFitPlugin |
DipoleFitTask(schema[, algMetadata]) |
A task that fits a dipole to a difference image, with an optional separate detection image. |
DipoleFitTaskConfig |
Measurement of detected diaSources as dipoles |
DipoleFluxControl |
|
DipoleMeasurementConfig |
Measurement of detected diaSources as dipoles |
DipoleMeasurementTask(schema[, algMetadata]) |
Measurement of Sources, specifically ones from difference images, for characterization as dipoles |
FindSetBitsU |
|
GetCalexpAsTemplateConfig |
|
GetCalexpAsTemplateTask([config, name, …]) |
Subtask to retrieve calexp of the same ccd number as the science image SensorRef for use as an image difference template. |
GetCoaddAsTemplateConfig |
|
GetCoaddAsTemplateTask([config, name, …]) |
Subtask to retrieve coadd for use as an image difference template. |
ImageMapReduceConfig |
Configuration parameters for the ImageMapReduceTask |
ImageMapReduceTask(*args, **kwargs) |
Split an Exposure into subExposures (optionally on a grid) and perform the same operation on each. |
ImageMapper([config, name, parentTask, log]) |
Abstract base class for any task that is to be used as ImageMapReduceConfig.mapper. |
ImageMapperConfig |
Configuration parameters for ImageMapper |
ImagePsfMatchConfig |
Configuration for image-to-image Psf matching. |
ImagePsfMatchTask(*args, **kwargs) |
Psf-match two MaskedImages or Exposures using the sources in the images. |
ImageReducer([config, name, parentTask, log]) |
Base class for any ‘reduce’ task that is to be used as ImageMapReduceConfig.reducer. |
ImageReducerConfig |
Configuration parameters for the ImageReducer |
ImageStatisticsD |
|
ImageStatisticsF |
|
ImageStatisticsI |
|
KernelCandidateDetectionF |
|
KernelCandidateF |
|
KernelCandidateQa(nKernelSpatial) |
Quality Assessment class for Kernel Candidates |
KernelPcaD |
|
KernelPcaVisitorF |
|
KernelSolution |
|
KernelSumVisitorF |
|
MaskedKernelSolutionF |
|
ModelPsfMatchConfig |
Configuration for model-to-model Psf matching |
ModelPsfMatchTask(*args, **kwargs) |
Matching of two model Psfs, and application of the Psf-matching kernel to an input Exposure |
NaiveDipoleCentroid |
|
NaiveDipoleFlux |
|
NbasisEvaluator(psfMatchConfig, …) |
A functor to evaluate the Bayesian Information Criterion for the number of basis sets going into the kernel fitting |
PsfDipoleFlux |
|
PsfDipoleFluxControl |
|
PsfMatchConfig |
Base configuration for Psf-matching |
PsfMatchConfigAL |
The parameters specific to the “Alard-Lupton” (sum-of-Gaussian) Psf-matching basis |
PsfMatchConfigDF |
The parameters specific to the delta-function (one basis per-pixel) Psf-matching basis |
PsfMatchTask(*args, **kwargs) |
Base class for Psf Matching; should not be called directly |
RegularizedKernelSolutionF |
|
SnapPsfMatchConfig |
|
SnapPsfMatchConfigAL |
Sum-of-Gaussian (Alard-Lupton) Psf-matching config optimized for snap subtraction |
SnapPsfMatchConfigDF |
Delta-function Psf-matching config optimized for snap subtraction |
SnapPsfMatchTask(*args, **kwargs) |
Image-based Psf-matching of two subsequent snaps from the same visit |
SourceFlagChecker(sources[, badFlags]) |
Functor class to check whether a diaSource has flags set that should cause it to be labeled bad. |
SpatialKernelSolution |
|
StaticKernelSolutionF |
|
ZogyConfig |
Configuration parameters for the ZogyTask |
ZogyImagePsfMatchConfig |
Config for the ZogyImagePsfMatchTask |
ZogyImagePsfMatchTask(*args, **kwargs) |
Task to perform Zogy PSF matching and image subtraction. |
ZogyMapReduceConfig |
Config to be passed to ImageMapReduceTask |
ZogyMapper(*args, **kwargs) |
Task to be used as an ImageMapper for performing ZOGY image subtraction on a grid of subimages. |
ZogyTask([templateExposure, …]) |
Task to perform ZOGY proper image subtraction. |
Class Inheritance Diagram¶
lsst.ip.diffim.metrics Module¶
Classes¶
NumberSciSourcesMetricTask(**kwargs) |
Task that computes the number of cataloged science sources. |
NumberSciSourcesMetricConfig |
|
FractionDiaSourcesToSciSourcesMetricTask(…) |
Task that computes the ratio of difference image sources to science sources in an image, visit, etc. |
FractionDiaSourcesToSciSourcesMetricConfig |