NC353L-PHG Post-Processing

Procedures done at post-processing stage

• Applying pixel mapping information
• Aberration correction
• Distortion correction
• Vignetting correction
• Color correction
• Denoising
• Sharpening

Requirements

• Linux OS (Kubuntu preferably).
• ImageJ.
• Elphel ImageJ Plugins.
• Place loci_tools.jar into ImageJ/plugins/.
• Place tiff_tags.jar into ImageJ/plugins/.
• Calibration data (come with camera)
• default-config.corr-xml (comes with camera)

Instructions

• Open terminal window:

cd /data/ImageJ
./run

• Go to Plugins -> ImageJ-Elphel -> Eyesis Correction

Note: if plugin needs to be recompiled - Plugins -> Compile & Run. Find and select Eyesis_Correction.java.

Eyesis corrections plugin interface

• Restore button -> browse for default_config.corr-xml (restores parameters for Configure correction)
• Configure correction button - make sure that the following paths are set correctly (if not - mark the checkboxes - a dialog for each path will pop up):

Source files directory                - directory with the footage images
Sensor calibration directory          - [YOUR-PATH]/calibration/sensors
Aberration kernels (sharp) directory  - [YOUR-PATH]/calibration/aberration_kernels/sharp
Aberration kernels (smooth) directory - [YOUR-PATH]/calibration/aberration_kernels/smooth
Equirectangular maps directory(may be empty) - [YOUR-PATH]/calibration/equirectangular_maps (it should be created automatically if the w/r rights of [YOUR-PATH]/calibration allow)

Source file suffix - .jp4 if jp4 files are processed
Sensor files prefix - the format is <prefix>NN.calib-tiff - <prefix> is blank if the files are just NN.calib-tiff. For XXX-NN.calib-tiff the prefix would be XXX-
Sensor files suffix - default is .calib-tiff
Kernel files (sharp)/(smooth) prefix - same rule as for the sensor files
Kernel files (sharp)/(smooth) suffix - default is .kernel-tiff
Equirectangular maps prefix - same rule as for the sensor files
Equirectangular maps suffix - default is .eqr-tiff

• Configure warping (Skip if the files already exist) -> rebuild map files - this will create maps in [YOUR-PATH]/calibration/equirectangular_maps. Will take ~5-10 minutes.
• Select source files -> select all the footage files to be processed.
• Process files to start the processing. Depending on the PC power can take ~40 minutes for a panorama of (24+2) images.
• After processing is done there is only the blending step. It can be launched manually or from the WebGUI:
  • WebGUI
  • Manual blending: the following script scans directory for *.tiffs from ImageJ and uses enblend(to stitch into 16-bit tiffs) and converts them into jpegs, in terminal:

php stitch.php [source_directory] [destination_directory]
- no slashes in the end of the paths