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diff --git a/noao/imred/vtel/doc/destreak.hlp b/noao/imred/vtel/doc/destreak.hlp new file mode 100644 index 00000000..ef05d905 --- /dev/null +++ b/noao/imred/vtel/doc/destreak.hlp @@ -0,0 +1,50 @@ +.help destreak Dec84 noao.imred.vtel +.ih +NAME +destreak -- Remove streaks from Helium 10830 grams +.ih +USAGE +destreak input_image output_image +.ih +PARAMETERS +.ls input_image +Image to be destreaked. +.le +.ls output_image +Name to give destreaked output image (must be a separate image). +.le +.ls tempim +Temporary image used for pixel storage between destreak passes. +.le +.ls verbose=no +Flag to signal program that it should produce verbose output. +.le +.ls threshold = 4 +Squibby brightness threshold to use in determining limb points. +.le +.ih +DESCRIPTION +The helium 10830 grams as taken by the vacuum telescope have horizontal +streaks caused by the detecting apparatus. Destreak removes these streaks +and the limb darkening +using a two pass procedure. First, for each diode, a function of the form +'a + b*r**4', where r is the radius from disk center and a, b are parameters, +is fit to the intensity distribution and is then subtracted from the data. +Then a spatial filter is applied to the result and the final image is +written to disk. The full disk images are 2048 x 2048 and are taken using +a 512 diode array which is scanned from west to east across the solar disk +4 times. Thus, data from a particular diode consists of four lines of the +image. +.ih +EXAMPLES +1. To destreak "image1", put the output in "image2", put the temporary image in +"temp2", and see verbose output, the command would be: + +.nf + vt> destreak image1 image2 temp2 v+ +.fi + +.ih +SEE ALSO +readvt, writevt, quickfit, getsqib, putsqib +.endhelp |