FIELD_FIND

        FIELD_FIND

    Makes  the field labelling of  an  image,  i.e.   identifies  connex ar-
    eas with image values higher than a given threshold and attribute them a
    number.   The  result is an image (of same size as the  input  one),  in
    which  the  value  of  a  pixel  is  the number of the field to which it
    belongs.  A zero value is attributed to pixels under the threshold.

    Note   that  blanked  pixels  may   adversely   affect   the   field la-
    belling...