#!/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)