Python implementation of the Bayesian MEF method
Project description
Bayesian MEF
Bayesian multi-exposure image fusion (MEF) is a general purpose MEF algorithm suitable for any imaging scheme requiring high dynamic range (HDR) treatment. Implementation of the algorithm in the context of ptychography has been published as "Bayesian multi-exposure image fusion for robust high dynamic range preprocessing in ptychography".
To install the package and its dependencies,
pip install bayes_mef
Usage
A minimal example demonstrating the usage of BayesianMEF
by simulating some data.
from bayes_mef import BayesianMEF
from skimage.data import camera
import numpy as np
# simulation params
truth = camera()
background = 60 # some background
times = np.array([0.1, 1, 10]) # exposure times or equivalently flux factors
threshold = 1500 # detector limit
# poisson data based on image formation model that is overexposed
data = [np.random.poisson(time * truth + background) for time in times]
data_saturated = np.clip(data, None, threshold, dtype="float")
# Bayesian MEF with optional field `update_fluxes`. Set it to `True` when
# flux factors (exposure times) are not accurately known.
mef_em = BayesianMEF(data_saturated, threshold, times, background, update_fluxes=False)
mef_em.run(n_iter=100)
fused_im = mef_em.fused_image.copy()
Under scripts/ directory, MEF with ptychographic data and subsequent reconstructions used in the publication can be tested. These are based on the package ptylab
that can be installed additionally.
pip install git+https://github.com/PtyLab/PtyLab.py.git@main
For faster reconstructions using GPU, please install cupy
as given under its installation guide.
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