Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/computing/software/gipsy/tsk/snapper.dc1 Дата изменения: Fri Jun 22 10:56:57 2001 Дата индексирования: Fri Jan 16 18:16:41 2009 Кодировка: Поисковые слова: m 17

Program: SNAPPER

Purpose: Replace values by a box with other values e.g.
for removing a bad perimeter of a velocity field.

Category: MANIPULATION, UTILITY, VELOCITY-FIELDS

File: snapper.c

Author: M.G.R. Vogelaar

Keywords:

INSET= Give input set (,subsets) to process:

Maximum number of subsets is 2048.
This set will be transformed to OUTSET= after replacing
certain values by other values.


BOX= Give box in ..... [entire subset]

Restrict operations to data within these limits.


OUTSET= Give output set (, subsets):

Output set and subset(s) for the result. The number of
output subsets is the same as the number of input sub-
sets.


OLDVAL= Which map value do you want to replace? [blank]

All values OLDVAL= in the input set will be replaced
by NEWVAL= Also its neighbours in a box with size
REPSIZE= get the new value.


NEWVAL= What is the new value? [blank]

This is the new value in OUTSET= which replaces
OLDVAL= in the input set.


REPSIZE= Size of replace box: [3 3]

Not only the pixel with OLDVAL= is replaced but also
its neighbours in a box with sizes in x and y direction
as defined in this keyword. If one selects REPSIZE=1 1
then you have the functionality of program CBLANK.


Notes: .......

Example: .......

Description: Suppose you have a velocity field with a perimeter defined
by a blank and a non-blank pixel and the values in your
perimeter are results of a poor fit. To remove such values
by hand can take a long time.
This program searches for values given in OLDVAL= and replaces
them by values entered in NEWVAL= in a box in the output set
with sizes entered in REPSIZE= and centered at the position
of the corresponding value in the input set.
In the default configuration,
this program replaces one blank by 9 blanks in a box with
size 3 x 3 pixels, thereby effectively 'eating' the blank/
non-blank perimeter of any object in the input map.


Updates: Sep 01, 1998: VOG, Document created.