preprocess_pan

preprocess_pan#

Run pre-processing steps for declassified panoramic images (e.g., KH-4 and KH-9 Panoramic Camera). By default, runs all steps (equivalent to “–steps all”):

  • extract: extracts images from tar files (skips if no tar files are found)

  • join: joins scanned image halves

  • filter: use a 1-sigma gaussian filter to smooth the images before cropping

  • crop: rotate and crop images to remove image frame

  • balance: use contrast-limited adaptive histogram equalization (clahe) to improve contrast in the image

To run steps individually, use the –steps flag with the corresponding step name(s). For example, to only run the ‘join’ and ‘crop’ steps:

preprocess_pan <flavor> –steps join crop <additional arguments>

usage: preprocess_pan [-h] [--steps STEPS [STEPS ...]]
                      [--skip SKIP [SKIP ...]] [--tar_ext TAR_EXT] [-r]
                      [-o OVERLAP] [-k BLOCK_SIZE] [-b] [-m MARKER_SIZE]
                      [-s FACTOR] [--clip_limit CLIP_LIMIT]
                      flavor

Positional Arguments#

flavor

The camera type (KH4 or KH9)

Named Arguments#

--steps

The pre-processing steps to run (default: all).

Default: 'all'

--skip

The pre-processing steps to skip (default: none).

Default: 'none'

--tar_ext

Extension for tar files (default: .tgz)

Default: '.tgz'

-r, --is_reversed

Order of image parts is reversed (a is the right side of the image). (default: False)

Default: False

-o, --overlap

The amount of overlap between image parts to use to search for matches. Default dependson flavor: KH4 -> 8000, KH9 -> 1000

-k, --block_size

the number of rows each search sub-block should cover (default: 2000).

Default: 2000

-b, --blend

Blend across image halves to prevent a sharp line at edge.

Default: False

-m, --marker_size

The size of the wagon wheel markers to identify in the image (default: 31 px)

Default: 31

-s, --factor

The number by which to divide the image width and height to scale the image (default: do not scale)

--clip_limit

Clipping limit, for contrast-limited adaptive histogram equalization. (default: 0.005)

Default: 0.005

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