AssembleCcdTask

class lsst.ip.isr.AssembleCcdTask(**kwargs)

Bases: Task

! @anchor AssembleCcdTask

@brief Assemble a set of amplifier images into a full detector size set of pixels.

@section ip_isr_assemble_Contents Contents

  • @ref ip_isr_assemble_Purpose

  • @ref ip_isr_assemble_Initialize

  • @ref ip_isr_assemble_IO

  • @ref ip_isr_assemble_Config

  • @ref ip_isr_assemble_Debug

  • @ref ip_isr_assemble_Example

@section ip_isr_assemble_Purpose Description

This task assembles sections of an image into a larger mosaic. The sub-sections are typically amplifier sections and are to be assembled into a detector size pixel grid. The assembly is driven by the entries in the raw amp information. The task can be configured to return a detector image with non-data (e.g. overscan) pixels included. The task can also renormalize the pixel values to a nominal gain of 1. The task also removes exposure metadata that has context in raw amps, but not in trimmed detectors (e.g. ‘BIASSEC’).

@section ip_isr_assemble_Initialize Task initialization

@copydoc __init__

@section ip_isr_assemble_IO Inputs/Outputs to the assembleCcd method

@copydoc assembleCcd

@section ip_isr_assemble_Config Configuration parameters

See @ref AssembleCcdConfig

@section ip_isr_assemble_Debug Debug variables

The command line task interface supports a flag @c -d to import @b debug.py from your @c PYTHONPATH; see <a href=”https://developer.lsst.io/stack/debug.html”>Debugging Tasks with lsstDebug</a> for more about @b debug.py files.

The available variables in AssembleCcdTask are: <DL>

<DT> @c display <DD> A dictionary containing debug point names as keys with frame number

as value. Valid keys are:

<DL>

<DT> assembledExposure <DD> display assembled exposure

</DL>

</DL>

@section ip_isr_assemble_Example A complete example of using AssembleCcdTask

<HR> To investigate the @ref ip_isr_assemble_Debug, put something like @code{.py} import lsstDebug def DebugInfo(name):

di = lsstDebug.getInfo(name) # N.b. lsstDebug.Info(name) would call

# us recursively

if name == “lsst.ip.isr.assembleCcdTask”:

di.display = {‘assembledExposure’:2}

return di

lsstDebug.Info = DebugInfo @endcode into your debug.py file and run runAssembleTask.py with the @c –debug flag.

Conversion notes:

Display code should be updated once we settle on a standard way of controlling what is displayed.

Methods Summary

assembleCcd(assembleInput)

!Assemble a set of amps into a single CCD size image @param[in] assembleInput -- Either a dictionary of amp lsst.afw.image.Exposures or a single lsst.afw.image.Exposure containing all raw amps. If a dictionary of amp exposures, the key should be the amp name. @return assembledCcd -- An lsst.afw.image.Exposure of the assembled amp sections.

emptyMetadata()

Empty (clear) the metadata for this Task and all sub-Tasks.

getFullMetadata()

Get metadata for all tasks.

getFullName()

Get the task name as a hierarchical name including parent task names.

getName()

Get the name of the task.

getTaskDict()

Get a dictionary of all tasks as a shallow copy.

makeField(doc)

Make a lsst.pex.config.ConfigurableField for this task.

makeSubtask(name, **keyArgs)

Create a subtask as a new instance as the name attribute of this task.

postprocessExposure(outExposure, inExposure)

Set exposure non-image attributes, including wcs and metadata and display exposure (if requested)

timer(name[, logLevel])

Context manager to log performance data for an arbitrary block of code.

Methods Documentation

assembleCcd(assembleInput)

!Assemble a set of amps into a single CCD size image @param[in] assembleInput – Either a dictionary of amp

lsst.afw.image.Exposures or a single lsst.afw.image.Exposure containing all raw amps. If a dictionary of amp exposures, the key should be the amp name.

@return assembledCcd – An lsst.afw.image.Exposure of the assembled

amp sections.

@throws TypeError with the following string:

<DL>
<DT> Expected either a dictionary of amp exposures or a single raw

exposure.

<DD> The input exposures to be assembled do not adhere to the

required format.

</DL>

@throws RuntimeError with the following string:

<DL>

<DT> No ccd detector found <DD> The detector set on the input exposure is not set.

</DL>

emptyMetadata() None

Empty (clear) the metadata for this Task and all sub-Tasks.

getFullMetadata() TaskMetadata

Get metadata for all tasks.

Returns:
metadataTaskMetadata

The keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc.

Notes

The returned metadata includes timing information (if @timer.timeMethod is used) and any metadata set by the task. The name of each item consists of the full task name with . replaced by :, followed by . and the name of the item, e.g.:

topLevelTaskName:subtaskName:subsubtaskName.itemName

using : in the full task name disambiguates the rare situation that a task has a subtask and a metadata item with the same name.

getFullName() str

Get the task name as a hierarchical name including parent task names.

Returns:
fullNamestr

The full name consists of the name of the parent task and each subtask separated by periods. For example:

  • The full name of top-level task “top” is simply “top”.

  • The full name of subtask “sub” of top-level task “top” is “top.sub”.

  • The full name of subtask “sub2” of subtask “sub” of top-level task “top” is “top.sub.sub2”.

getName() str

Get the name of the task.

Returns:
taskNamestr

Name of the task.

See also

getFullName
getTaskDict() Dict[str, ReferenceType[Task]]

Get a dictionary of all tasks as a shallow copy.

Returns:
taskDictdict

Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc.

classmethod makeField(doc: str) ConfigurableField

Make a lsst.pex.config.ConfigurableField for this task.

Parameters:
docstr

Help text for the field.

Returns:
configurableFieldlsst.pex.config.ConfigurableField

A ConfigurableField for this task.

Examples

Provides a convenient way to specify this task is a subtask of another task.

Here is an example of use:

class OtherTaskConfig(lsst.pex.config.Config):
    aSubtask = ATaskClass.makeField("brief description of task")
makeSubtask(name: str, **keyArgs: Any) None

Create a subtask as a new instance as the name attribute of this task.

Parameters:
namestr

Brief name of the subtask.

keyArgs

Extra keyword arguments used to construct the task. The following arguments are automatically provided and cannot be overridden:

  • “config”.

  • “parentTask”.

Notes

The subtask must be defined by Task.config.name, an instance of ConfigurableField or RegistryField.

postprocessExposure(outExposure, inExposure)

Set exposure non-image attributes, including wcs and metadata and display exposure (if requested)

Call after assembling the pixels

@param[in,out] outExposure assembled exposure:
  • removes unwanted keywords

  • sets wcs, filter, and detector

@param[in] inExposure input exposure

timer(name: str, logLevel: int = 10) Iterator[None]

Context manager to log performance data for an arbitrary block of code.

Parameters:
namestr

Name of code being timed; data will be logged using item name: Start and End.

logLevel

A logging level constant.

See also

timer.logInfo

Examples

Creating a timer context:

with self.timer("someCodeToTime"):
    pass  # code to time