GRASS logo

NAME

i.histo.match - Calculate histogram matching of several images.

KEYWORDS

imagery, histogram matching

SYNOPSIS

i.histo.match
i.histo.match --help
i.histo.match input=name[,name,...] [suffix=string] [output=name] [database=name] [max=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters:

input=name[,name,...] [required]
Name of raster maps to analize
suffix=string
Suffix for output maps
Default: match
output=name
Name for mosaic output map
database=name
Name of database
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/histo.db
max=integer
Number of the maximum value for raster maps
Default: 255

Table of contents

DESCRIPTION

i.histo.match performs histogram matching on the given input images.

NOTES

The histogram matching method is based on the method Cumulative Distribution Function (CDF) of two or more histograms. Each value of original CDF is compared with the target histogram in order to obtain the target CDF value closest to the original value.

EXAMPLE

This example is based the North Carolina GRASS sample data set, [complete GRASS location].
# create the output with histogram matching
i.histo.match input=lsat5_1987_10,lsat7_2000_10

# set grey color to the new maps
r.colors map=lsat5_1987_10.match color=grey
r.colors map=lsat7_2000_10.match color=grey

# visualize and compare the results
Original data:

Matched data:

SEE ALSO

i.ortho.photo, i.rectify

AUTHORS

Luca Delucchi, Fondazione E. Mach (Italy)

based on original PERL code was developed by: Laura Zampa (2004), student of Dipartimento di Informatica e Telecomunicazioni, Facolta' di Ingegneria, University of Trento and ITC-irst, Trento (Italy)

Last changed: $Date: 2014-03-03 15:06:28 +0100 (Mon, 03 Mar 2014) $

SOURCE CODE

Available at: i.histo.match source code (history)


Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index

© 2003-2017 GRASS Development Team, GRASS GIS 7.2.3svn Reference Manual