Flat Field Correction
Overview
Corrects the pixel-to-pixel variations in the detector response by applying a flat field correction to the input data.
Class: FlatFieldStep
Algorithm
The appropriate master flat calibration is divided into the input data. The input’s err attribute is updated by adding the dark’s err attribute in quadarature under a linear assumption. DQ flags are updated with bitwise or.
Any pixel values in the flat field reference data that are set to NaN will have their values reset to one before being divided into the science data, which will effectively skip the flat field operation for those pixels.
Arguments
- input
str|ImagerModel|IFUImageModel The input data to remove the dark from.
- flat
str|FlatModel|None The name of the flat field reference file or a flat field model instance. If not provided, the flat field is retrieved from the appropriate archive.
Subarrays
The flat field is dependent on the detector read mode, therefore subarrays are corrected using the specified read mode.