MEDFILT-Applies a median filter to an image

Description:

The result of this operation is an image in which the value of each pixel is the median value of a rectangular box of pixels centered on the corresponding pixel in the original array. MEDFILT only supports a square box. MEDFILTR allows rectangular boxes to be used.

Parameters:

IMAGE

Name of image to be smoothed.

BOX

Size of box for median calculations.

OUTPUT

Name of resulting image.

See also:

FIGARO: MEDFILTR, BCLEAN, CLEAN, COSREJ, ISMOOTH, IXSMOOTH.
KAPPA: FFCLEAN, GAUSMOOTH, MEDIAN.

Source comments:

 M E D F I L T   /    M E D F I L T R

 Figaro routines to median filter an image.  The result of
 this operation is an image in which the value of each pixel
 is the median value of a rectangular box of pixels centered on the
 corresponding pixel in the original array. MEDFILTR allows the
 box to be specified with different X and Y dimensions, while the
 original MEDFILT only supported a square box. MEDFILTR is therefore
 a full superset of MEDFILT, but the older application has to be
 retained for compatability reasons.

 Command parameters for MEDFILT -

 IMAGE    The name of the structure containing the image.

 BOX      (Numeric) The size of the box (in pixels) to be
          used in calculating the medians.  Should be odd;
          if even, BOX-1 will be used.

 OUTPUT   The name of the result of the operation.  This can
          be the same as for IMAGE.  If not, a new structure
          is created, with everything but the data a direct
          copy of the input.

                                  KS / CIT 28th Jan 1984