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#!/usr/bin/env python
###############################################################################
# $Id: fft.py 18195 2009-12-06 20:24:39Z rouault $
#
# Project: GDAL Python samples
# Purpose: Script to perform forward and inverse two-dimensional fast
# Fourier transform.
# Author: Andrey Kiselev, dron@remotesensing.org
#
###############################################################################
# Copyright (c) 2003, Andrey Kiselev <dron@remotesensing.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################
try:
from osgeo import gdal
from osgeo.gdalconst import *
import numpy as Numeric
except ImportError:
import gdal
from gdalconst import *
import Numeric
import FFT
import sys
# =============================================================================
def Usage():
print('Usage: fft.py [-inv] [-of out_format] [-ot out_type] infile outfile')
print('')
sys.exit( 1 )
# =============================================================================
# =============================================================================
def ParseType(type):
if type == 'Byte':
return GDT_Byte
elif type == 'Int16':
return GDT_Int16
elif type == 'UInt16':
return GDT_UInt16
elif type == 'Int32':
return GDT_Int32
elif type == 'UInt32':
return GDT_UInt32
elif type == 'Float32':
return GDT_Float32
elif type == 'Float64':
return GDT_Float64
elif type == 'CInt16':
return GDT_CInt16
elif type == 'CInt32':
return GDT_CInt32
elif type == 'CFloat32':
return GDT_CFloat32
elif type == 'CFloat64':
return GDT_CFloat64
else:
return GDT_Byte
# =============================================================================
infile = None
outfile = None
format = 'GTiff'
type = None
transformation = 'forward'
# Parse command line arguments.
i = 1
while i < len(sys.argv):
arg = sys.argv[i]
if arg == '-inv':
transformation = 'inverse'
if type == None:
type = GDT_Float32
elif arg == '-of':
i = i + 1
format = sys.argv[i]
elif arg == '-ot':
i = i + 1
type = ParseType(sys.argv[i])
set_type = 'yes'
elif infile is None:
infile = arg
elif outfile is None:
outfile = arg
else:
Usage()
i = i + 1
if infile is None:
Usage()
if outfile is None:
Usage()
if type == None:
type = GDT_CFloat32
indataset = gdal.Open( infile, GA_ReadOnly )
out_driver = gdal.GetDriverByName(format)
outdataset = out_driver.Create(outfile, indataset.RasterXSize, indataset.RasterYSize, indataset.RasterCount, type)
for iBand in range(1, indataset.RasterCount + 1):
inband = indataset.GetRasterBand(iBand)
outband = outdataset.GetRasterBand(iBand)
data = inband.ReadAsArray(0, 0)
if transformation == 'forward':
data_tr = FFT.fft2d(data)
else:
data_tr = FFT.inverse_fft2d(data)
outband.WriteArray(data_tr)
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