magphase.py

#!/usr/bin/env python3
# ******************************************************************************
#
#  Project:  GDAL
#  Purpose:  Example computing the magnitude and phase from a complex image.
#  Author:   Frank Warmerdam, warmerdam@pobox.com
#
# ******************************************************************************
#  Copyright (c) 2008, Frank Warmerdam <warmerdam@pobox.com>
#
# SPDX-License-Identifier: MIT
# ******************************************************************************

import sys

import numpy as np

from osgeo import gdal, gdal_array


def Usage():
    print(
        f"Usage: {sys.argv[0]} -- This is a sample. Read source to know how to use. --"
    )
    return 2


def doit(src_filename, dst_magnitude, dst_phase):
    src_ds = gdal.Open(src_filename)
    xsize = src_ds.RasterXSize
    ysize = src_ds.RasterYSize
    print("{} x {}".format(xsize, ysize))

    src_image = src_ds.GetRasterBand(1).ReadAsArray()
    mag_image = pow(
        np.real(src_image) * np.real(src_image)
        + np.imag(src_image) * np.imag(src_image),
        0.5,
    )
    gdal_array.SaveArray(mag_image, dst_magnitude)

    phase_image = np.angle(src_image)
    gdal_array.SaveArray(phase_image, dst_phase)
    return 0


def main(argv=sys.argv):
    if len(sys.argv) <= 4:
        return Usage()
    # src_filename = 'complex.tif'
    # dst_magnitude = 'magnitude.tif'
    # dst_phase = 'phase.tif'
    if len(argv) > 1:
        src_filename = argv[1]
    if len(argv) > 2:
        dst_magnitude = argv[2]
    if len(argv) > 3:
        dst_phase = argv[3]
    return doit(src_filename, dst_magnitude, dst_phase)


if __name__ == "__main__":
    sys.exit(main(sys.argv))