vircam_imcombine
[Unit Test Recipes]

Name:

vircam_imcombine

Purpose:

Combine a series of exposures into a single mean frame

Description:

A load of images are combined into a mean frame.

Language:

C

Parameters:

• comb (int): Determines the type of combination that is done to form the output map. Can take the following values:
  • (1): The output pixels are medians of the input pixels
  • (2): The output pixels are means of the input pixels
• scale (int): Determines how the input data are scaled or offset before they are combined. Can take the following values:
  • (0): No scaling of offsetting
  • (1): All input frames are biassed additively to bring their backgrounds to a common mean.
  • (2): All input frames are scaled multiplicatively to bring their backgrounds to a common mean.
  • (3): All input frames are scaled to a uniform exposure time and then additively corrected to bring their backgrounds to a common mean.
• xrej (int): If set, then an extra rejection cycle will be run.
• thr (float): The rejection threshold in numbers of sigmas.
• ext (int): The image extension of the input files to be done on this run. If all of the extensions are to be processed, then this should be set to zero.

Input File Types:

The following list gives the file types that can appear in the SOF file. The word in bold is the DO category value.

• SCIENCE_IMAGE (required): A list of images for combining

Output File Types:

The following lists the output data frames that are generated by this recipe. The word in bold gives the PRO CATG keyword value for each.

• SIMPLE_IMAGE_TEST: An output combined image

Notes

None.

Fatal Error Conditions:

• No input images

Non-Fatal Error Conditions:

None

Author:

Jim Lewis, CASU

Code Reference:

tests/vircam_imcombine.c

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