NOTcam postprocessing and QuickLook
reduction
When starting up the NOTcam control software on Lisa, a gray
Postprocessing user interface will appear on one of Lisa's
monitors. This interface allows the user to fire off a
QuickLook reduction process, suitable for many kinds of data.
The program can also be started manually, using the command
notcam@elizabeth> /usr/local/bin/notcam-postproc
The postprocessing is done once a image frame is saved to disk by the
BIAS control program. The user also has the posibility to postprocess an
arbitrary image in the image directory by using the "Analyze this" option.
When a new file is written by BIAS, the previous
QuickLook processes will be killed automatically.
NOTcam postprocessing/QuickLook tasks
One can activate or deactivate the postprocessing tasks by checking
the corresponding button on the UIF with the mouse. Note that the QuickExamine, SlitOffset, and FocusPyramid
task cannot be active at the same time : only switch one of
them on and the other two off.
Currently 3 tasks are available:
- QuickExamine: this pops up IRAF imexamine in
DS9 on the monitor of Florence.
This task can be used for examining data from NOTcam,
be it images or spectra, with the possibility of making a subtraction of a
sky image. The first image plane will be displayed (e.g. nd270123[*,*,1]).
- SlitOffset: this pops up the image on Lisa's monitor
in the IRAF task imexamine in order to make a slit offset.
This is used for placing an object on the slit
(or any other desired place). The user can define the resulting
position of the object and an optional sky image to subtract in order to
being able to better see the object. The first image plane will be displayed (e.g. nd270123[*,*,1]).
- FocusPyramid: this pops up an image display on Lisa's monitor, with a (sky subtracted)
image taken with the focus pyramid in the beam.
This task is used when focussing the telescope.
Currently, the task only supports the WFC, with internal focus 5650.
NOTcam postprocessing/QuickLook tasks usage and
options
All 3 tasks are configurable.
Click on the Options button, set the appropriate options, and
click Update to activate the options settings.
- QuickExamine: the following options are currently available:
- SkySubtraction (on or off)
- Name of sky image to subtract (a filename with 'NC' prefix, or else blank for no subtraction)
- Always use last image as sky image for sky subtraction (on or off)
Press 'q' in the image display to quit. Press '?' to get online
help. Read the IRAF help on imexamine
for a full description of the functionality.
- SlitOffset: the following parameters and options are currently available:
- AccessCode (TCS access code)
- X slit (X position of the slit)
Note that it is crucial to determine the X position in one of
the postprocessing image displays (*not* in BIAS-ds9 !).
- Y slit (Y position of the slit)
- SkySubtraction (on or off)
- Name of sky image to subtract (name or blank for no subtraction)
The image (sky subtracted or not) is displayed in DS9 on lisa's display
and the 'imexamine' task is initiated. Two options are available:
1) press 'a' to determine the object position with a 2D Gauss fit or,
2) press 'x' to use the x,y positon of the graphics cursor (usefull for
extended objects).
Press 'q' in the graphics display to quit. The telescope and guideprobe
will now be offset, using a combined offset in order to place the
object on the chosen (X slit, Y slit) position. Note that you have to
be autoguiding to use this task.
- FocusPyramid: the following options are currently available:
- SkySubtraction (on or off)
- Name of sky image to subtract (a filename or else blank for no subtraction)
This task prints instructions on the terminal window that pops up.
New: Analyse
this! At the bottom part of the UIF a new button
and file-name editing field now give the possibility to analyse any
file that is located in the /data/alfosc directory.
When the button is clicked, the system will behave exactly as if the
file were just produced by BIAS.
Trouble shooting If you encounter problems (e.g. the
notcam-postproc UIF doesn't seem to do what you instruct it to do) ,
the best way to get out of trouble is to exit all quicklook programs, and
restart as described above. Make sure that only one version of
"notcam-postproc" is running.
Staff only: the postprocessing tasks can be fired off manually
following these instructions.
NOTcam postprocessing/QuickLook: under development
The QuickLook postprocessing is still under development.
Any suggestions for improvements or functionality enhancements are welcome:
please contact JHT or JC.
To do list:
add manual launch possibility. (Done for ALFOSC.)
solve interface hangups
Go for radio button style in UIF, such that only one task can be active at the time
fix startup bug: rewrite 'options' file at startup, or read the old file
Fix bug: guideprobe moves wrong way , when using slit offset. Fixed 3/6 2004, JC.
Fix bug: quickexam previous image 9,99,999. Fixed 16/6/2005 JHT
add HRC functionality to FocusPyramid. Test algorithm for
different internal focus settings. Done (16/6/2005 JHT)!!
Need to examine through-focus images to accurately determine
FocusPyramid parameters WFC/HRC. Done (8/2006 AD)!!
Fix support of HRC in slitoffset.
|
