Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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] [nprocs=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 be analyzed
- suffix=string
- Suffix for output maps
- Default: match
- output=name
- Name for mosaic output map
- database=name
- DEPRECATED, do not use
- max=integer
- Number of the maximum value for raster maps
- Default: 255
- nprocs=integer
- Number of threads for parallel computing
- Default: 1
i.histo.match performs histogram matching on the given input images.
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.
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:
i.ortho.photo,
i.rectify
Laura Zampa 2004, student of Dipartimento di Informatica e
Telecomunicazioni, Facolta' di Ingegneria, University of Trento and ITC-irst,
Trento (Italy); original PERL code
Luca Delucchi, Fondazione E. Mach (Italy); implementation with Python / SQLite
Stefan Blumentrath (Norway); current, parallelized implementation with Numpy
SOURCE CODE
Available at:
i.histo.match source code
(history)
Latest change: Sunday Jan 07 13:42:55 2024 in commit: 986ae4dc69ae870fc9f02ffb09cd81079f73aff5
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GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual