MergeDefectsTask¶

MergeDefectsTask combines all of the partial defect sets from the individual exposure measurements into a complete final defect set.

Processing summary¶

MergeDefectsTask runs these operations:

Combine all input partial defect sets by the input image type (usually dark and flat exposures) based on the fraction of inputs that have a defect in each pixel.
Create the final defect set from the union of all the per-image type defects.
Optionally mask the edges of the detectors.

Python API summary¶

from lsst.cp.pipe.defects import MergeDefectsTask

classMergeDefectsTask(*, config=None, log=None, initInputs=None, **kwargs): Merge the defects from multiple exposures...

attributeconfig: Access configuration fields and retargetable subtasks.

methodrun(inputDefects, camera): Merge a list of single defects to find the common defect regions...

Retargetable subtasks¶

No subtasks.

Configuration fields¶

assertSameRun¶

Default: False
Field type: bool Field

Ensure that all visits are from the same run? Raises if this is not the case, or if the run key isn’t found.

combinationFraction¶

Default: 0.7
Field type: float RangeField
Range: [0,1)

The fraction (0..1) of visits in which a pixel was found to be defective across the visit list in order to be marked as a defect. Note, upper bound is exclusive, so use mode AND to require pixel to appear in all images.

combinationMode¶

Default

'FRACTION'

Field type

str ChoiceField (optional)

Choices

'AND': Logical AND the pixels found in each visit to form set
'OR': Logical OR the pixels found in each visit to form set
'FRACTION': Use pixels found in more than config.combinationFraction of visits
None: Field is optional

Which types of defects to identify

connections¶

Data type: lsst.pipe.base.config.MergeDefectsTaskConfigConnections
Field type: ConfigField

Configurations describing the connections of the PipelineTask to datatypes

edgesAsDefects¶

Default: False
Field type: bool Field

Mark all edge pixels, as defined by nPixBorder[UpDown, LeftRight], as defects.

ignoreFilters¶

Default: True
Field type: bool Field

Set the filters used in the CALIB_ID to NONE regardless of the filters on the input images. Allows mixing of filters in the input flats. Set to False if you think your defects might be chromatic and want to have registry support for varying defects with respect to filter.

nPixBorderLeftRight¶

Default: 5
Field type: int Field

Number of pixels on left & right of image to mask as defects if edgesAsDefects is True.

nPixBorderUpDown¶

Default: 5
Field type: int Field

Number of pixels on top & bottom of image to mask as defects if edgesAsDefects is True.

nullFilterName¶

Default: 'NONE'
Field type: str Field

The name of the null filter if ignoreFilters is True. Usually something like NONE or EMPTY

saveLogOutput¶

Default: True
Field type: bool Field

Flag to enable/disable saving of log output for a task, enabled by default.

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