.. _VisMasterBiasFrame:
  
Vis Master Bias Frame Product
-----------------------------

$SetSchemaPath vis/euc-vis-MasterBiasFrame.xsd
  
Data product name
=================
.. DataProductNameStart
   
$PrintDataProductName
   
.. DataProductNameEnd
   
Data product custodian
======================
.. DataProductCustodianStart
   
$PrintDataProductCustodian
   
.. DataProductCustodianEnd
   
Name of the Schema file
=======================
.. NameSchemaStart
   
$PrintSchemaFilename
   
.. NameSchemaEnd

Last Edited for DPDD Version
============================
.. NameSchemaStart
   
1.1
   
.. NameSchemaEnd

Processing Element(s) creating/using the data product
=====================================================
.. PECreatorStart

Final data product of the Master Bias Calibration pipeline. 
Used by the Bias Correction task in several pipelines: (ProcessField, LargeFlat, CTI, DistortionModel, PRNU Small Scale Flat, NonLinearity, BrighterFatter, XTalk).

.. PECreatorEnd
   
Processing function using the data product
==========================================
.. PFUsingStart

VIS

.. PFUsingEnd

Proposed for inclusion in EAS/SAS
==========================================
.. PFUsingStart

Yes

.. PFUsingEnd

Data product elements
=====================
.. DataProductElementsStart

$PrintDataProductElements

.. DataProductElementsEnd
   
Detailed description of the data product
========================================
.. DetailedDescStart

The Master Bias Calibration Pipeline result is created from a series of bias calibration exposures.  This contains a Master Bias, to be used in other OU-VIS pipelines.

The Master Bias contains the offset of each pixel relative to the pedestal, which is an offset per quadrant, added by the electronics.  Each pixel is the sigma-clipped mean of the value of that pixel in all the frames.

A rectangular region is used to measure the pedestal of each frame. That is subtracted from each frame before they are combined. start-end measuring the main bias offset level.  CCD pixel columns and lines are numbered 0 to N-1, relative to the readout node, so that the same values are appropriate for all quadrants.  This means that [0,0] is the first pixel to be read out.  Start and end values are both inclusive.  NOTE that this is DIFFERENT from the convention used in FITS files, which relates to the physical X,Y axes of the focal plane.

The final product has 144 image extensions, one per VIS CCD quadrant.  Each is identified by the EXTNAME, which is a combination of CCDID (CCD-Row then CCD-Column) and QuadrantID.  E.g. 2.3-H.  Size of quadrant images 2128x2086 pixels in ADU units.

Primary Header:

$PrintPrimaryHeader fit/euc-vis.xml vis.masterFlat

Extension Header:

$PrintExtensionHeader fit/euc-vis.xml vis.masterBias FRAME.n

.. DetailedDescEnd