glRunLength

Name
Syntax
Description
Options
Restrictions
See also
Author
Examples
Id

Name

glRunLength - Grey value distribution of run lengths

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 also can be chosen (option -aver).

Several features can be extracted from this matrix, using the options described below. If you don't specify any options for features, then the program will compute all the parameters.

Options

The first seven options are for the features which can be extracted from the GLRL matrix.

-sre

Short Run emphasis

-lre

Long Run emphasis

-gln

Grey Level Nonuniformity

-rln

Run Length Nonuniformity

-rp

Run Percentage

-sgre

Low Grey Level Run emphasis

-lgre

High Grey Level Run emphasis

-h

A header for the output is wanted.

-hori

Horizontal direction

-vert

Vertical direction

-aver

Consider both directions and take the average of them. (Default direction options is -hori.)

-heq

Histogram equalization of the input image.

-o filename

Run length matrix will be saved as an image in filename.

-qlevels quantization_levels Number of grey levels in the input will be grouped into given number of quantization levels. Default is 256.

 glRunLength mona.img
 glRunLength -h mona.img
 glRunLength -h -sre -rp -gln mona.img
 glRunLength -h -sre -o mona.out mona.img
 glRunLength -h -sre -o mona.out mona.img -qlevels 16
 glRunLength -h mona.img -qlevels 32
 glRunLength mona.img -aver

Id

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

glRunLength

Contents

Name