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% @(#)testb3ccd.hlq 19.1 (ESO-SDAG) 02/25/03 14:16:56
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%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%.COPYRIGHT (c) 1994 European Southern Observatory
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%.KEYWORDS MIDAS, ccd package, bias, testing
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%.PURPOSE On-line help file for the command: TESTB3/CCD
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%.VERSION 940620 RHW created
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%.VERSION 950210 RHW txt output eleiminated; printed info reduced
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%---------------------------------------------------------------------
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TESTB3/CCD 20-Jun-1994 RHW
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TESTB3/CCD in_frm [out_id] [area] [size] [option]
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Find the hot pixels in a (combined) bias frame
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Find the hot pixels in a (combined) bias frame
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TESTB3/CCD in_frm [out_id] [area] [size] [option]
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in_frm = input frame; no default
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out_id = output identifier for the output of the test prodedure.
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All output (i.e. frames, listings and plots) will start
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with this identifier. Default is BIAS.
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area = area which the hot pixels will be determined. Reducing the
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area will increase the speed of the execution. Default is
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size = size of smoothing box used for median filtering used for
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obtaining the hot pixel list. Default is 5.
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This command is the third test in a series of tests on bias frames:
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B1 to B5. See the command TESTBA/CCD.
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The command will try to find the hot pixels. The combined bias frame
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is median filtered (using the parameter `size') and subtracted
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from the original. A plot is generated showing the position of the hot
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pixels and the affected columns. Hot pixels will only be searched for
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within the requested area and above the intensity level of
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(mean + 0.25*sigma + 5.), where mean is the mean intensity level,
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sigma is the standard deviation.
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To avoid unnecessary computations the command checks for the presence
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of the median filtered hot pixel frame and does not recompute this
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frames if is already present.
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For more details about the various combining methods, please refer
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to the CCD Chapter in Volume B of the ESO-MIDAS Users' Guide.
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The command will stored the outputs in a number of ascii and
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postscript files (preceding by the identification string out_id):\\
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`out_id'_hotpix.tbl: MIDAS table containing the hot pixels;\\
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`out_id'_hotpix.ps: postscript file with a plot of the hot pixels\\
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TESTBA/CCD, SET/CCD, SHOW/CCD, COMBINE/CCD, AVERAGE/ROW,
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AVERAGE/COLUMN, FILTER/MEDIAN, Ch. 3 in Vol. 2 of the Users Guide.
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TESTB3/CCD BIAS BS [@900,@900:@1100,@1100]
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Run the test procedure on the frame BIAS. All output will start with
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the identifier BS. Use the default for median filter box.