glRunLength

Name

glRunLength - create the Grey level run length matrix

Syntax

 #include <xite/texture.h>

 void glRunLength( IBAND input, II_BAND output,
    int hori, int vert, int average, int noofgl,
    int* maxlength, int* noofruns );

Description

The run length statistics can be used to extract texture information of an image from its grey level runs. Consecutive pixels of the same grey value, in a given direction (either horizontal or vertical), constitute a run. The numbers of runs of different lengths and grey values, arranged according to the lengths and grey levels, form a 2-D matrix called grey level run length matrix.

There are two possible directions to scan the image, either horizontal or vertical directions. The average of these two directions can also be chosen. Several features can be extracted from this matrix.

Restrictions

input must have pixel type unsigned byte. output must have pixel type integer.

Return value

 0 => Ok
 1 => bad pixel type in input band
 2 => bad pixel type in output band

Author

Yogesan, BLAB, Ifi, UiO

Modified by

Tor Lønnestad, BLAB, Ifi, UiO

Id

$Id: glRunLength.c,v 1.27 1997/03/07 12:52:20 svein Exp $