Version 6 (modified by emca, 9 years ago) (diff)

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Leica digital camera processing

The RCD produces raw files that need to be processed in order to create TIFF files. The processing basically uses a gain and offset scaling and (probably) corrects for lens distortion. See the RCD page for more details, including filename convention.

Processing the raws

  1. Load the Leica photo processing software
    • Under Windows, select start->programs->leica->calibration->Calibration Post Processing
    • If using wine, run "leica_photo_processing"
  2. Select the appropriate camera config (Parameters)
    • As of late 2009, this is CH39_021_060
    • There may be updates to this as the camera is recalibrated
  3. Select the input files
    • Typically this will be something like ~airborne/workspace/IPY09_11-2009_219_Helheim/leica/RCD/images
    • You can click and shift-click to select a list from the open file dialog, but be aware that it appears to take about 5 seconds per file under wine, so expect a long wait while it's thinking (it hasn't crashed!)
  4. Unset all the processing options (Auto Contrast, Adaptive left-right balance)
  5. Select the output directory
    • Typically this will be something like ~airborne/workspace/IPY09_11-2009_219_Helheim/leica/RCD/images-processed
  6. Select 16 bit TIFF output (this is important''')
  7. Hit the start button and go for coffee (allow about 20-30secs per file)

A typical processing setup looks like:

Example processing screen

Tagging the TIFFs

TBC:

python ~chrfi/tifftagger -v -V -p IPY09/11 -l Helheim -f 219 /users/rsg/airborne/workspace/IPY09_11-2009_219_Helheim/leica/RCD/logs/090807-120958ImageEvents1.csv /users/rsg/airborne/workspace/IPY09_11-2009_219_Helheim/leica/RCD/images-processed/

Code needs some cleanup, putting into subversion, and a wrapper written that'll cross check on errors (e.g. compare no of images in and out).

Subsequent processing

There are several other steps that could be undertaken:

  • orthorectification (map the photos with respect to the ground/aircraft position)
  • ? geocorrection (map the photos with respect to the ground + a DEM) - possibly only Bill's azgcorr mods could do this
  • compositing orthorectified photos and seam-line adjustment
    • compositing is easy, but will have ugly problems when you get different views on an object with vertical structure
    • to improve the look of this, you have to manually edit the positioning of the joins - this is currently a very manual process and we do not currently have software for it

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