MAKE_BPM - Creates and files a bad-pixel mask from a long-exposure dark

Description:

This recipe reduces a long-exposure dark-frame observation of infrared imaging data to create a bad-pixel mask. It files the mask in the mask index file. Reduction comprises only thresholding the pixel values about a clipped mean using a multiple of the clipped standard deviation.

Notes:

• The dark must have a minimum exposure of 20 seconds.

• Clipping is at 2,3,3 standard deviations.

• Bad values are deemed to be those beyond the range of the clipped mean +/- 5 standard deviations.

• Intermediate frames are deleted.

• Sub-arrays are supported.

Output Data :

• The bad-pixel mask is called bpm_<frame_number>.

• The bad-pixel mask is filed in $ORAC_DATA_OUT/index.mask.

Related Recipes :

DARK_AND_BPM.

Implementation Status:

• The processing engines are from the Starlink package KAPPA.

• Uses the Starlink NDF format.

• History is recorded within the data files.

• The title of the data is "bpm_<frame_number>".

• Error propagation is not used.