Image processing, analysis

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Image files

  • IMG1_0018.CR2: raw file [in ./CR2/ directory]
  • IMG1_0018.info: basic info written during image acquisition. Contains weather data, mount pointing, etc... [in ./CR2info/ directory]
  • IMG1_0018.imstat: image statistics. Created by skycam_mkimstat command. Image levels, etc... [in ./CR2info/ directory]
  • IMG1_0018.astrom: astrometry and image distortion. Created by astromSolve command. See below for explanation [in ./CR2info/ directory]

Compiling a summary list of all images

The main data acquisition program can be used to compile a summary list of all images, which is very useful for quick data searches. 
skycam mkimlist
This creates a text file imlist.txt with one line per image.

Bias

The bias for both cameras is 1024 ADU.

Flat Field

Identifying bad pixels

Astrometry

The astrometric solution for a file consists of position of central image pixel (RA, DEC), position angle, pixel scale, and distortion coefficients. A single command generates the astrometry file: 

astromSolve 2011-02-26 IMG1_0018
This command reads the IMG1_0018.CR2 raw file and the IMG1_0018.info file (for rough estimate of pointint). The output is the IMG1_0018.astrom text file containing the astrometry and distortion parameters.

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