CrosstalkExtractTask

CrosstalkExtractTask measures the flux ratios between bright sources on one amplifier and the same location on the other amplifiers to look for crosstalk sources.

Processing summary

CrosstalkExtractTask runs these operations:

  1. Identifies bright sources on each amplifier.

  2. Iterates over the other amplifiers, extracting those potential targets to ensure they have the readout corner placed at the same amplifier coordinate.

  3. Measures the ratio between the background subtracted target location and the source amplifier location.

Python API summary

from lsst.cp.pipe.measureCrosstalk import CrosstalkExtractTask
classCrosstalkExtractTask(**kwargs)

Task to measure pixel ratios to find crosstalk...

attributeconfig

Access configuration fields and retargetable subtasks.

methodrun(inputExp, sourceExps=[])

Measure pixel ratios between amplifiers in inputExp...

See also

See the CrosstalkExtractTask API reference for complete details.

Retargetable subtasks

background

Default

lsst.meas.algorithms.subtractBackground.SubtractBackgroundTask

Field type

ConfigurableField

Background estimation task.

Configuration fields

badMask

Default
['BAD', 'INTRP']
Field type

str ListField

Mask planes to ignore when identifying source pixels.

connections

Data type

lsst.pipe.base.config.CrosstalkExtractConfigConnections

Field type

ConfigField

Configurations describing the connections of the PipelineTask to datatypes

doMeasureInterchip

Default
False
Field type

bool Field

Measure inter-chip crosstalk as well?

ignoreSaturatedPixels

Default
False
Field type

bool Field

Should saturated pixels be ignored?

isTrimmed

Default
True
Field type

bool Field

Is the input exposure trimmed?

saveLogOutput

Default
True
Field type

bool Field

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

threshold

Default
30000
Field type

float Field

Minimum level of source pixels for which to measure crosstalk.

Debugging

extract

Display the exposure under consideration, with the pixels used for crosstalk measurement indicated by the DETECTED mask plane (bool)?

pixels

Display a plot of the ratio calculated for each pixel used in this exposure, split by amplifier pairs. The median value is listed for reference (bool)?