1 HISTO_DOUBLE
        HISTO_DOUBLE

    Computes the histogram of an image (Y_image)  as   a   function   of   a
    second  one  (Z_image).   This  gives  an  information  similar  to, but
    slightly different from  the  cross  histogram  (cf  HISTO_CROSS).   The
    program  computes  histogram  of  the mean value and standard deviation.
    The result is a table of 4 Columns, in which
      1) the first column contains the mean value of the  Y_image   (average
        of all pixels in the Y_image for which the Z_image value is included
        in the corresponding slot)
      2) the second the standard deviation (of the Y_image values).
      3) the third the number of pixels of the Y_image   used   to   compute
        the mean and deviation.
      4) the fourth column contains the histogram abscissa   (actual   value
        of the input Z_image)

2 Z_NAME$
        TASK\FILE "First input image" Z_NAME$

    This is the name of the input image that defines the histogram slots.
2 Y_NAME$
        TASK\FILE "Second input image" Y_NAME$

    This is the name of the input image that defines the histogram values.
2 Y_BLC$
        TASK\INTEGER "Bottom left corner" Y_BLC$[4]

    This is the position (in pixels) of the Bottom Left Corner of  the  part
    of both maps that will be used to compute the histogram.
2 Y_TRC$
        TASK\INTEGER "Top right corner" Y_TRC$[4]

    This is the position (in pixels) of the Top Right Corner of the part  of
    both maps that will be used to compute the histogram.
2 X_BIN$
        TASK\INTEGER "Number of histograms bins" X_BINS$

    This is the number of histogram slots that will be  defined  within  the
    values of the first image.
2 X_MIN$
        TASK\REAL "Minimum value" X_MIN$

    This is the value (of the first image) corresponding to the lowest bin.
2 X_MAX$
        TASK\REAL "Maximum value" X_MAX$

    This is the value (of the first image) corresponding to the highest bin.
2 X_NAME$
        TASK\FILE "Output histogram name" X_NAME$

    This is the name of the output histogram.
1 END