morphErode

Name

morphErode - morphological grayscale erode on an image.

Syntax

morphErode <-a | -b> <struct_element> <inimage> <outimage>

Description

morphErode calculates the morphological operation erode on the inimage with a structuring element given by struct_element (in combination with option -a or -b). The resulting image is sent to outimage. The actual calculation is performed with the expression:

 outband(x,y) = min[inband(x+i,y+j)-B(-i,-j)]

with i and j inside the structuring element B and (0,0) as the center pixel of B.

Restrictions

Input images must be of the following types:

inimage: Unsigned byte.
struct_element: With option -a: Ascii characters (numbers) describing the structuring element. With option -b: BIFF image with pixel type signed short.

Options

-a struct_element: struct_element is an ascii file which contains the structuring element. See ascii2biff(1) for file format.
-b struct_element: struct_element is a BIFF image which contains the structuring element.

Return value

 0 : OK
 1 : Usage message
 2 : Illegal number of arguments
 3 : No structuring element

Author

Martin Torpe Lie, BLAB, Ifi, UiO

Examples

 morphErode ~blab/img/mona.img mona.img -a filter.txt
 morphErode ~blab/img/mona.img mona.img -b filter.img

Id

$Id: morphErode.c,v 1.23 1997/03/18 12:09:16 svein Exp $