b4equal Documentation

b4equal - Find statistics about cubes for use by EQUALIZER
B4EQUAL finds the current mean pixel value of each cube and stores the
value in the label keyword PHOTOPT_MEAN which will be used by EQUALIZER.
It also finds the mean of each cube in the overlap area with another
cube, the slope of a line of best fit of the brightness values between
the two cubes (mode=CONTRAST) or the ratio of the standard deviations of
the brightness values in each cube (mode=SD), and the number of points
used in calculating the statistics.  This information is stored in the
PHOTO_RAD_POINTs for use by EQUALIZER.  The program tests for special
pixel values at each pixel in each pair of cubes in the overlap area.
If either pixel is special, no statistics are gathered for either cube
at that pixel.  This program only works on cubes that have been
transformed to a map projection.

This program may be used for multi-band cubes.  Separate statistics
are gathered for each band.

NOTE: all previous PHOTO_RAD_POINTs are removed from the labels when
this program is run.

PROGRAMMER: Kay Edwards, U.S.G.S. Flagstaff, AZ

Input cube file names
(default extension is .cub)
     or

--

List of input cube file names
(no default extension)

--

Enter the fit mode
(CONTRAST or SD)

CONTRAST

ADDITIONAL NOTES:

Parm	Description
FROM	Input cube file names. If the file extension is omitted, then ".cub" will be assumed. A maximum of 50 cubes may be listed using FROM.
FROMLIST	This is a file containing the list of cubes that are to be compared. A maximum of 2048 cubes may be listed.