nonlinear_power_curvature.py 1.42 KB
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright(C) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

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from ..operators import InversionEnabler
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from .response_operators import LinearizedPowerResponse


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def NonlinearPowerCurvature(position, FFT, Instrument, nonlinearity,
                            Projection, N, T, sample_list, inverter):
    result = None
    for sample in sample_list:
        LinearizedResponse = LinearizedPowerResponse(
            Instrument, nonlinearity, FFT, Projection, position, sample)
        op = LinearizedResponse.adjoint*N.inverse*LinearizedResponse
        result = op if result is None else result + op
    result = result*(1./len(sample_list)) + T
    return InversionEnabler(result, inverter)