processCcd.py

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#!/usr/bin/env python
#
# LSST Data Management System
# Copyright 2008, 2009, 2010 LSST Corporation.
#
# This product includes software developed by the
# LSST Project (http://www.lsst.org/).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.    See the
# GNU General Public License for more details.
#
# You should have received a copy of the LSST License Statement and
# the GNU General Public License along with this program.  If not,
# see <http://www.lsstcorp.org/LegalNotices/>.
#
from .processImage import ProcessImageTask
from lsst.ip.isr import IsrTask
import lsst.afw.table as afwTable
import lsst.pex.config as pexConfig
import lsst.pipe.base as pipeBase

class ProcessCcdConfig(ProcessImageTask.ConfigClass):
    """Config for ProcessCcd"""
    doIsr = pexConfig.Field(dtype=bool, default=True, doc = "Perform ISR?")
    isr = pexConfig.ConfigurableField(
        target = IsrTask,
        doc = "Instrumental Signature Removal",
    )

class ProcessCcdTask(ProcessImageTask):
    """Process a CCD
    
    Available steps include:
    - instrument signature removal (ISR)
    - calibrate
    - detect sources
    - measure sources
    """
    ConfigClass = ProcessCcdConfig
    _DefaultName = "processCcd"
    dataPrefix = ""

    def __init__(self, **kwargs):
        ProcessImageTask.__init__(self, **kwargs)
        self.makeSubtask("isr")

    def makeIdFactory(self, sensorRef):
        expBits = sensorRef.get("ccdExposureId_bits")
        expId = long(sensorRef.get("ccdExposureId"))
        return afwTable.IdFactory.makeSource(expId, 64 - expBits)        

    @pipeBase.timeMethod
    def run(self, sensorRef):
        """Process one CCD
        
        @param sensorRef: sensor-level butler data reference
        @return pipe_base Struct containing these fields:
        - postIsrExposure: exposure after ISR performed if calib.doIsr or config.doCalibrate, else None
        - exposure: calibrated exposure (calexp): as computed if config.doCalibrate,
            else as upersisted and updated if config.doDetection, else None
        - calib: object returned by calibration process if config.doCalibrate, else None
        - sources: detected source if config.doPhotometry, else None
        """
        self.log.info("Processing %s" % (sensorRef.dataId))

        # initialize outputs
        postIsrExposure = None
        
        if self.config.doIsr:
            postIsrExposure = self.isr.run(sensorRef).exposure
        elif self.config.doCalibrate:
            postIsrExposure = sensorRef.get(self.dataPrefix + "postISRCCD")
        
        # delegate most of the work to ProcessImageTask
        result = self.process(sensorRef, postIsrExposure)
        result.postIsrExposure = postIsrExposure
        return result