prpy: Phase Retrieval in Python

(under construction)
This module aims to calculate phase retrieval (PR) in Python.

Requirement

This module has dependencies on the following modules.

• Python (>= 3.4)
  • Probably this module is available on Python 2.7 (not tested).
• NumPy (>= 1.11)
• Matplotlib (>= 1.5)
  • mpl_toolkits.mplot3d
• importlib

If you want to do calculation with pyfftw or pycuda, the following modules are also required.

• pyfftw (for pyfftw)
• multiprocessing (for pyfftw)
• pycuda (for pycuda)
• skcuda (for pycuda)

Installation

Currently, installing this module requires the following steps:

1. Download this module as a zip (or tar.gz) file.
2. Unzip the file to to any directory.
3. Run python setup.py install at the directory.

If the above procedure does not work, please try the following:

1. Download this module as a zip (or tar.gz) file.
2. Unzip the file to to any directory.
3. Run python setup.py sdist at the directory.
   • A package file prpy-x.x.x.tar.gz is created in dist directory.
4. Move to dist directory.
5. Run pip install ./prpy-x.x.x.tar.gz at the directory.

Hierarchical structure of prpy module

/prpy
    calc_cuncs.py    : calculation functions
    fft_funcs.py     : FFT wrappers
    filters.py       : filter functions
    Plan.py          : Plan class of PR, like Plan class of pyfftw
    proj_density.py  : projection functions in real space (error reduction, etc.)
    proj_modulus.py  : projection functions in frequency space
    utils.py         :

Projection functions

In real space, following functions are available:

• projection_er : error reduction algorithm
• projection_hio : hybrid input-output algorithm
• projection_hpr : hybrid projection-reflection algorithm

In frequency space, projection_modulus applies constraints to a Fourier modulus.