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# -*- coding: utf-8 -*-
#
# Project: Azimuthal integration
# https://github.com/silx-kit/pyFAI
#
# Copyright (C) 2003-2018 European Synchrotron Radiation Facility, Grenoble,
# France
#
# 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.
"""
Utilities, mainly for image treatment
"""
__authors__ = ["Jérôme Kieffer", "Valentin Valls"]
__contact__ = "Jerome.Kieffer@ESRF.eu"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "10/01/2018"
__status__ = "production"
import logging
import numpy
import fabio
import weakref
from scipy import ndimage
from scipy.interpolate import interp1d
from scipy.optimize.optimize import fmin
from scipy.optimize.optimize import fminbound
from .third_party import six
from .utils import stringutil
from ._version import calc_hexversion
if ("hexversion" not in dir(fabio)) or (fabio.hexversion < calc_hexversion(0, 4, 0, "dev", 5)):
# Short cut fabio.factory do not exists on older versions
fabio.factory = fabio.fabioimage.FabioImage.factory
logger = logging.getLogger(__name__)
class ImageReductionFilter(object):
"""
Generic filter applied in a set of images.
"""
def init(self, max_images=None):
"""
Initialize the filter before using it.
:param int max_images: Max images supported by the filter
"""
pass
def add_image(self, image):
"""
Add an image to the filter.
:param numpy.ndarray image: image to add
"""
raise NotImplementedError()
def get_parameters(self):
"""Return a dictionary containing filter parameters
:rtype: dict
"""
return {"cutoff": None, "quantiles": None}
def get_result(self):
"""
Get the result of the filter.
:return: result filter
"""
raise NotImplementedError()
class ImageAccumulatorFilter(ImageReductionFilter):
"""
Filter applied in a set of images in which it is possible
to reduce data step by step into a single merged image.
"""
def init(self, max_images=None):
self._count = 0
self._accumulated_image = None
def add_image(self, image):
"""
Add an image to the filter.
:param numpy.ndarray image: image to add
"""
self._accumulated_image = self._accumulate(self._accumulated_image, image)
self._count += 1
def _accumulate(self, accumulated_image, added_image):
"""
Add an image to the filter.
:param numpy.ndarray accumulated_image: image use to accumulate
information
:param numpy.ndarray added_image: image to add
"""
raise NotImplementedError()
def get_result(self):
"""
Get the result of the filter.
:return: result filter
:rtype: numpy.ndarray
"""
result = self._accumulated_image
# release the allocated memory
self._accumulated_image = None
return result
class MaxAveraging(ImageAccumulatorFilter):
name = "max"
def _accumulate(self, accumulated_image, added_image):
if accumulated_image is None:
return added_image
return numpy.maximum(accumulated_image, added_image)
class MinAveraging(ImageAccumulatorFilter):
name = "min"
def _accumulate(self, accumulated_image, added_image):
if accumulated_image is None:
return added_image
return numpy.minimum(accumulated_image, added_image)
class SumAveraging(ImageAccumulatorFilter):
name = "sum"
def _accumulate(self, accumulated_image, added_image):
if accumulated_image is None:
return added_image
return accumulated_image + added_image
class MeanAveraging(SumAveraging):
name = "mean"
def get_result(self):
result = super(MeanAveraging, self).get_result()
return result / numpy.float32(self._count)
class ImageStackFilter(ImageReductionFilter):
"""
Filter creating a stack from all images and computing everything at the
end.
"""
def init(self, max_images=None):
self._stack = None
self._max_stack_size = max_images
self._count = 0
def add_image(self, image):
"""
Add an image to the filter.
:param numpy.ndarray image: image to add
"""
if self._stack is None:
shape = self._max_stack_size, image.shape[0], image.shape[1]
self._stack = numpy.zeros(shape, dtype=numpy.float32)
self._stack[self._count] = image
self._count += 1
def _compute_stack_reduction(self, stack):
"""Called after initialization of the stack and return the reduction
result."""
raise NotImplementedError()
def get_result(self):
if self._stack is None:
raise Exception("No data to reduce")
shape = self._count, self._stack.shape[1], self._stack.shape[2]
self._stack.resize(shape)
result = self._compute_stack_reduction(self._stack)
# release the allocated memory
self._stack = None
return result
class AverageDarkFilter(ImageStackFilter):
"""
Filter based on the algorithm of average_dark
TODO: Must be split according to each filter_name, and removed
"""
def __init__(self, filter_name, cut_off, quantiles):
super(AverageDarkFilter, self).__init__()
self._filter_name = filter_name
self._cut_off = cut_off
self._quantiles = quantiles
@property
def name(self):
return self._filter_name
def get_parameters(self):
"""Return a dictionary containing filter parameters"""
return {"cutoff": self._cut_off, "quantiles": self._quantiles}
def _compute_stack_reduction(self, stack):
"""
Compute the stack reduction.
:param numpy.ndarray stack: stack to reduce
:return: result filter
:rtype: numpy.ndarray
"""
return average_dark(stack,
self._filter_name,
self._cut_off,
self._quantiles)
_FILTERS = [
MaxAveraging,
MinAveraging,
MeanAveraging,
SumAveraging,
]
_FILTER_NAME_MAPPING = {}
for f in _FILTERS:
_FILTER_NAME_MAPPING[f.name] = f
_AVERAGE_DARK_FILTERS = set(["min", "max", "sum", "mean", "std", "quantiles", "median"])
def is_algorithm_name_exists(filter_name):
"""Return true if the name is a name of a filter algorithm"""
if filter_name in _FILTER_NAME_MAPPING:
return True
elif filter_name in _AVERAGE_DARK_FILTERS:
return True
return False
class AlgorithmCreationError(RuntimeError):
"""Exception returned if creation of an ImageReductionFilter is not
possible"""
pass
def create_algorithm(filter_name, cut_off=None, quantiles=None):
"""Factory to create algorithm according to parameters
:param cutoff: keep all data where (I-center)/std < cutoff
:type cutoff: float or None
:param quantiles: 2-tuple of floats average out data between the two
quantiles
:type quantiles: tuple(float, float) or None
:return: An algorithm
:rtype: ImageReductionFilter
:raise AlgorithmCreationError: If it is not possible to create the
algorithm
"""
if filter_name in _FILTER_NAME_MAPPING and cut_off is None:
# use less memory
filter_class = _FILTER_NAME_MAPPING[filter_name]
algorithm = filter_class()
elif filter_name in _AVERAGE_DARK_FILTERS:
# must create a big array with all the data
if filter_name == "quantiles" and quantiles is None:
raise AlgorithmCreationError("Quantiles algorithm expect quantiles parameters")
algorithm = AverageDarkFilter(filter_name, cut_off, quantiles)
else:
raise AlgorithmCreationError("No algorithm available for the expected parameters")
return algorithm
def bounding_box(img):
"""
Tries to guess the bounding box around a valid massif
:param img: 2D array like
:return: 4-typle (d0_min, d1_min, d0_max, d1_max)
"""
img = img.astype(numpy.int)
img0 = (img.sum(axis=1) > 0).astype(numpy.int)
img1 = (img.sum(axis=0) > 0).astype(numpy.int)
dimg0 = img0[1:] - img0[:-1]
min0 = dimg0.argmax()
max0 = dimg0.argmin() + 1
dimg1 = img1[1:] - img1[:-1]
min1 = dimg1.argmax()
max1 = dimg1.argmin() + 1
if max0 == 1:
max0 = img0.size
if max1 == 1:
max1 = img1.size
return (min0, min1, max0, max1)
def remove_saturated_pixel(ds, threshold=0.1, minimum=None, maximum=None):
"""
Remove saturated fixes from an array inplace.
:param ds: a dataset as ndarray
:param float threshold: what is the upper limit?
all pixel > max*(1-threshold) are discareded.
:param float minimum: minumum valid value (or True for auto-guess)
:param float maximum: maximum valid value
:return: the input dataset
"""
shape = ds.shape
if ds.dtype == numpy.uint16:
maxt = (1.0 - threshold) * 65535.0
elif ds.dtype == numpy.int16:
maxt = (1.0 - threshold) * 32767.0
elif ds.dtype == numpy.uint8:
maxt = (1.0 - threshold) * 255.0
elif ds.dtype == numpy.int8:
maxt = (1.0 - threshold) * 127.0
else:
if maximum is None:
maxt = (1.0 - threshold) * ds.max()
else:
maxt = maximum
if maximum is not None:
maxt = min(maxt, maximum)
invalid = (ds > maxt)
if minimum:
if minimum is True:
# automatic guess of the best minimum TODO: use the HWHM to guess the minumum...
data_min = ds.min()
x, y = numpy.histogram(numpy.log(ds - data_min + 1.0), bins=100)
f = interp1d((y[1:] + y[:-1]) / 2.0, -x, bounds_error=False, fill_value=-x.min())
max_low = fmin(f, y[1], disp=0)
max_hi = fmin(f, y[-1], disp=0)
if max_hi > max_low:
f = interp1d((y[1:] + y[:-1]) / 2.0, x, bounds_error=False)
min_center = fminbound(f, max_low, max_hi)
else:
min_center = max_hi
minimum = float(numpy.exp(y[((min_center / y) > 1).sum() - 1])) - 1.0 + data_min
logger.debug("removeSaturatedPixel: best minimum guessed is %s", minimum)
ds[ds < minimum] = minimum
ds -= minimum # - 1.0
if invalid.sum(dtype=int) == 0:
logger.debug("No saturated area where found")
return ds
gi = ndimage.morphology.binary_dilation(invalid)
lgi, nc = ndimage.label(gi)
if nc > 100:
logger.warning("More than 100 saturated zones were found on this image !!!!")
for zone in range(nc + 1):
dzone = (lgi == zone)
if dzone.sum(dtype=int) > ds.size // 2:
continue
min0, min1, max0, max1 = bounding_box(dzone)
ksize = min(max0 - min0, max1 - min1)
subset = ds[max(0, min0 - 4 * ksize):min(shape[0], max0 + 4 * ksize), max(0, min1 - 4 * ksize):min(shape[1], max1 + 4 * ksize)]
while subset.max() > maxt:
subset = ndimage.median_filter(subset, ksize)
ds[max(0, min0 - 4 * ksize):min(shape[0], max0 + 4 * ksize), max(0, min1 - 4 * ksize):min(shape[1], max1 + 4 * ksize)] = subset
return ds
def average_dark(lstimg, center_method="mean", cutoff=None, quantiles=(0.5, 0.5)):
"""
Averages a serie of dark (or flat) images.
Centers the result on the mean or the median ...
but averages all frames within cutoff*std
:param lstimg: list of 2D images or a 3D stack
:param str center_method: is the center calculated by a "mean", "median",
"quantile", "std"
:param cutoff: keep all data where (I-center)/std < cutoff
:type cutoff: float or None
:param quantiles: 2-tuple of floats average out data between the two
quantiles
:type quantiles: tuple(float, float) or None
:return: 2D image averaged
"""
if "ndim" in dir(lstimg) and lstimg.ndim == 3:
stack = lstimg.astype(numpy.float32)
shape = stack.shape[1:]
length = stack.shape[0]
else:
shape = lstimg[0].shape
length = len(lstimg)
if length == 1:
return lstimg[0].astype(numpy.float32)
stack = numpy.zeros((length, shape[0], shape[1]), dtype=numpy.float32)
for i, img in enumerate(lstimg):
stack[i] = img
if center_method in dir(stack):
center = stack.__getattribute__(center_method)(axis=0)
elif center_method == "median":
logger.info("Filtering data (median)")
center = numpy.median(stack, axis=0)
elif center_method.startswith("quantil"):
logger.info("Filtering data (quantiles: %s)", quantiles)
sorted_ = numpy.sort(stack, axis=0)
lower = max(0, int(numpy.floor(min(quantiles) * length)))
upper = min(length, int(numpy.ceil(max(quantiles) * length)))
if (upper == lower):
if upper < length:
upper += 1
elif lower > 0:
lower -= 1
else:
logger.warning("Empty selection for quantil %s, would keep points from %s to %s", quantiles, lower, upper)
center = sorted_[lower:upper].mean(axis=0)
else:
raise RuntimeError("Cannot understand method: %s in average_dark" % center_method)
if cutoff is None or cutoff <= 0:
output = center
else:
std = stack.std(axis=0)
strides = 0, std.strides[0], std.strides[1]
std.shape = 1, shape[0], shape[1]
std.strides = strides
center.shape = 1, shape[0], shape[1]
center.strides = strides
mask = ((abs(stack - center) / std) > cutoff)
stack[numpy.where(mask)] = 0.0
summed = stack.sum(axis=0)
output = summed / numpy.float32(numpy.maximum(1, (length - mask.sum(axis=0))))
return output
class MonitorNotFound(Exception):
"""Raised when monitor information in not found or is not valid."""
pass
def _get_monitor_value_from_edf(image, monitor_key):
"""Return the monitor value from an EDF image using an header key.
Take care of the counter and motor syntax using for example 'counter/bmon'
which reach 'bmon' value from 'counter_pos' key using index from
'counter_mne' key.
:param fabio.fabioimage.FabioImage image: Image containing the header
:param str monitor_key: Key containing the monitor
:return: returns the monitor else raise a MonitorNotFound
:rtype: float
:raise MonitorNotFound: when the expected monitor is not found on the
header
"""
keys = image.header
if "/" in monitor_key:
base_key, mnemonic = monitor_key.split('/', 1)
mnemonic_values_key = base_key + "_mne"
mnemonic_values = keys.get(mnemonic_values_key, None)
if mnemonic_values is None:
raise MonitorNotFound("Monitor mnemonic key '%s' not found in the header" % (mnemonic_values_key))
mnemonic_values = mnemonic_values.split()
pos_values_key = base_key + "_pos"
pos_values = keys.get(pos_values_key)
if pos_values is None:
raise MonitorNotFound("Monitor pos key '%s' not found in the header" % (pos_values_key))
pos_values = pos_values.split()
try:
index = mnemonic_values.index(mnemonic)
except ValueError as _e:
logger.debug("Exception", exc_info=1)
raise MonitorNotFound("Monitor mnemonic '%s' not found in the header key '%s'" % (mnemonic, mnemonic_values_key))
if index >= len(pos_values):
raise MonitorNotFound("Monitor value '%s' not found in '%s'. Not enougth values." % (pos_values_key))
monitor = pos_values[index]
else:
if monitor_key not in keys:
raise MonitorNotFound("Monitor key '%s' not found in the header" % (monitor_key))
monitor = keys[monitor_key]
try:
monitor = float(monitor)
except ValueError as _e:
logger.debug("Exception", exc_info=1)
raise MonitorNotFound("Monitor value '%s' is not valid" % (monitor))
return monitor
def get_monitor_value(image, monitor_key):
"""Return the monitor value from an image using an header key.
:param fabio.fabioimage.FabioImage image: Image containing the header
:param str monitor_key: Key containing the monitor
:return: returns the monitor else raise an exception
:rtype: float
:raise MonitorNotFound: when the expected monitor is not found on the
header
"""
if monitor_key is None:
return Exception("No monitor defined")
if isinstance(image, fabio.edfimage.EdfImage):
return _get_monitor_value_from_edf(image, monitor_key)
elif isinstance(image, fabio.numpyimage.numpyimage):
return _get_monitor_value_from_edf(image, monitor_key)
else:
raise Exception("File format '%s' unsupported" % type(image))
def _normalize_image_stack(image_stack):
"""
Convert input data to a list of 2D numpy arrays or a stack
of numpy array (3D array).
:param image_stack: slice of images
:type image_stack: list or numpy.ndarray
:return: A stack of image (list of 2D array or a single 3D array)
:rtype: list or numpy.ndarray
"""
if image_stack is None:
return None
if isinstance(image_stack, numpy.ndarray) and image_stack.ndim == 3:
# numpy image stack (single 3D image)
return image_stack
if isinstance(image_stack, list):
# list of numpy images (multi 2D images)
result = []
for image in image_stack:
if isinstance(image, six.string_types):
data = fabio.open(image).data
elif isinstance(image, numpy.ndarray) and image.ndim == 2:
data = image
else:
raise Exception("Unsupported image type '%s' in image_stack" % type(image))
result.append(data)
return result
raise Exception("Unsupported type '%s' for image_stack" % type(image_stack))
class AverageWriter():
"""Interface for using writer in `Average` process."""
def write_header(self, merged_files, nb_frames, monitor_name):
"""Write the header of the average
:param list merged_files: List of files used to generate this output
:param int nb_frames: Number of frames used
:param str monitor_name: Name of the monitor used. Can be None.
"""
raise NotImplementedError()
def write_reduction(self, algorithm, data):
"""Write one reduction
:param ImageReductionFilter algorithm: Algorithm used
:param object data: Data of this reduction
"""
raise NotImplementedError()
def close(self):
"""Close the writer. Must not be used anymore."""
raise NotImplementedError()
class MultiFilesAverageWriter(AverageWriter):
"""Write reductions into multi files. File headers are duplicated."""
def __init__(self, file_name_pattern, file_format, dry_run=False):
"""
:param str file_name_pattern: File name pattern for the output files.
If it contains "{method_name}", it is updated for each
reduction writing with the name of the reduction.
:param str file_format: File format used. It is the default
extension file.
:param bool dry_run: If dry_run, the file is created on memory but not
saved on the file system at the end
"""
self._file_name_pattern = file_name_pattern
self._global_header = {}
self._fabio_images = weakref.WeakKeyDictionary()
self._dry_run = dry_run
# in case "edf.gz"
if "." in file_format:
file_format = file_format.split(".")[0]
self._fabio_class = fabio.factory(file_format + "image")
def write_header(self, merged_files, nb_frames, monitor_name):
self._global_header["nfiles"] = len(merged_files)
self._global_header["nframes"] = nb_frames
if monitor_name is not None:
self._global_header["monitor_name"] = monitor_name
pattern = "merged_file_%%0%ii" % len(str(len(merged_files)))
for i, f in enumerate(merged_files):
name = pattern % i
self._global_header[name] = f.filename
def _get_file_name(self, reduction_name):
keys = {"method_name": reduction_name}
return stringutil.safe_format(self._file_name_pattern, keys)
def write_reduction(self, algorithm, data):
file_name = self._get_file_name(algorithm.name)
# overwrite the method
header = fabio.fabioimage.OrderedDict()
header["method"] = algorithm.name
for name, value in self._global_header.items():
header[name] = str(value)
filter_parameters = algorithm.get_parameters()
for name, value in filter_parameters.items():
header[name] = str(value)
image = self._fabio_class.__class__(data=data, header=header)
if not self._dry_run:
image.write(file_name)
logger.info("Wrote %s", file_name)
self._fabio_images[algorithm] = image
def get_fabio_image(self, algorithm):
"""Get the constructed fabio image
:rtype: fabio.fabioimage.FabioImage
"""
return self._fabio_images[algorithm]
def close(self):
"""Close the writer. Must not be used anymore."""
self._header = None
def common_prefix(string_list):
"""Return the common prefix of a list of strings
TODO: move it into utils package
:param list(str) string_list: List of strings
:rtype: str
"""
prefix = ""
for ch in zip(string_list):
c = ch[0]
good = True
for i in ch:
if i != c:
good = False
break
if good:
prefix += c
else:
break
return prefix
class AverageObserver(object):
def image_loaded(self, fabio_image, image_index, images_count):
"""Called when an input image is loaded"""
pass
def process_started(self):
"""Called when the full processing is started"""
pass
def algorithm_started(self, algorithm):
"""Called when an algorithm is started"""
pass
def frame_processed(self, algorithm, frame_index, frames_count):
"""Called after providing a frame to an algorithm"""
pass
def result_processing(self, algorithm):
"""Called before the result of an algorithm is computed"""
pass
def algorithm_finished(self, algorithm):
"""Called when an algorithm is finished"""
pass
def process_finished(self):
"""Called when the full process is finished"""
pass
class Average(object):
"""Process images to generate an average using different algorithms."""
def __init__(self):
"""Constructor"""
self._dark = None
self._raw_flat = None
self._flat = None
self._monitor_key = None
self._threshold = None
self._minimum = None
self._maximum = None
self._fabio_images = []
self._writer = None
self._algorithms = []
self._nb_frames = 0
self._correct_flat_from_dark = False
self._results = weakref.WeakKeyDictionary()
self._observer = None
def set_observer(self, observer):
"""Set an observer to the average process.
:param AverageObserver observer: An observer
"""
self._observer = observer
def set_dark(self, dark_list):
"""Defines images used as dark.
:param list dark_list: List of dark used
"""
if dark_list is None:
self._dark = None
return
darks = _normalize_image_stack(dark_list)
self._dark = average_dark(darks, center_method="mean", cutoff=4)
def set_flat(self, flat_list):
"""Defines images used as flat.
:param list flat_list: List of dark used
"""
if flat_list is None:
self._raw_flat = None
return
flats = _normalize_image_stack(flat_list)
self._raw_flat = average_dark(flats, center_method="mean", cutoff=4)
def set_correct_flat_from_dark(self, correct_flat_from_dark):
"""Defines if the dark must be applied on the flat.
:param bool correct_flat_from_dark: If true, the dark is applied.
"""
self._correct_flat_from_dark = correct_flat_from_dark
def get_counter_frames(self):
"""Returns the number of frames used for the process.
:rtype: int
"""
return self._nb_frames
def get_fabio_images(self):
"""Returns source images as fabio images.
:rtype: list(fabio.fabioimage.FabioImage)"""
return self._fabio_images
def set_images(self, image_list):
"""Defines the set set of source images to used to process an average.
:param list image_list: List of filename, numpy arrays, fabio images
used as source for the computation.
"""
self._fabio_images = []
self._nb_frames = 0
if len(image_list) > 100:
# if too many files are opened, it may crash. The har limit is 1024
copy_data = True
else:
copy_data = False
for image_index, image in enumerate(image_list):
if isinstance(image, six.string_types):
logger.info("Reading %s", image)
fabio_image = fabio.open(image)
if copy_data and fabio_image.nframes == 1:
# copy the data so that we can close the file right now.
fimg = fabio_image.convert(fabio_image.__class__)
fimg.filename = image
fabio_image.close()
fabio_image = fimg
elif isinstance(image, fabio.fabioimage.fabioimage):
fabio_image = image
else:
if fabio.hexversion < 262148:
logger.error("Old version of fabio detected, upgrade to 0.4 or newer")
# Assume this is a numpy array like
if not isinstance(image, numpy.ndarray):
raise RuntimeError("Not good type for input, got %s, expected numpy array" % type(image))
fabio_image = fabio.numpyimage.NumpyImage(data=image)
if self._observer:
self._observer.image_loaded(fabio_image, image_index, len(image_list))
self._fabio_images.append(fabio_image)
self._nb_frames += fabio_image.nframes
def set_monitor_name(self, monitor_name):
"""Defines the monitor name used to correct images before processing
the average. This monitor must be part of the file header, else the
image is skipped.
:param str monitor_name: Name of the monitor available on the header
file
"""
self._monitor_key = monitor_name
def set_pixel_filter(self, threshold, minimum, maximum):
"""Defines the filter applied on each pixels of the images before
processing the average.
:param threshold: what is the upper limit?
all pixel > max*(1-threshold) are discareded.
:param minimum: minimum valid value or True
:param maximum: maximum valid value
"""
self._threshold = threshold
self._minimum = minimum
self._maximum = maximum
def set_writer(self, writer):
"""Defines the object write which will be used to store the result.
:param AverageWriter writer: The writer to use."""
self._writer = writer
def add_algorithm(self, algorithm):
"""Defines another algorithm which will be computed on the source.
:param ImageReductionFilter algorithm: An averaging algorithm.
"""
self._algorithms.append(algorithm)
def _get_corrected_image(self, fabio_image, image):
"""Returns an image corrected by pixel filter, saturation, flat, dark,
and monitor correction. The internal computation is done in float
64bits. The result is provided as float 32 bits.
:param fabio.fabioimage.FabioImage fabio_image: Object containing the
header of the data to process
:param numpy.ndarray image: Data to process
:rtype: numpy.ndarray
"""
corrected_image = numpy.ascontiguousarray(image, numpy.float64)
if self._threshold or self._minimum or self._maximum:
corrected_image = remove_saturated_pixel(corrected_image, self._threshold, self._minimum, self._maximum)
if self._dark is not None:
corrected_image -= self._dark
if self._flat is not None:
corrected_image /= self._flat
if self._monitor_key is not None:
try:
monitor = get_monitor_value(fabio_image, self._monitor_key)
corrected_image /= monitor
except MonitorNotFound as e:
logger.warning("Monitor not found in filename '%s', data skipped. Cause: %s", fabio_image.filename, str(e))
return None
return numpy.ascontiguousarray(corrected_image, numpy.float32)
def _get_image_reduction(self, algorithm):
"""Returns the result of an averaging algorithm using all over
parameters defined in this object.
:param ImageReductionFilter algorithm: Averaging algorithm
:rtype: numpy.ndarray
"""
algorithm.init(max_images=self._nb_frames)
frame_index = 0
for fabio_image in self._fabio_images:
for frame in range(fabio_image.nframes):
if fabio_image.nframes == 1:
data = fabio_image.data
else:
data = fabio_image.getframe(frame).data
logger.debug("Intensity range for %s#%i is %s --> %s", fabio_image.filename, frame, data.min(), data.max())
corrected_image = self._get_corrected_image(fabio_image, data)
if corrected_image is not None:
algorithm.add_image(corrected_image)
if self._observer:
self._observer.frame_processed(algorithm, frame_index, self._nb_frames)
frame_index += 1
if self._observer:
self._observer.result_processing(algorithm)
return algorithm.get_result()
def _update_flat(self):
"""
Update the flat according to the last process parameters
:rtype: numpy.ndarray
"""
if self._raw_flat is not None:
flat = numpy.array(self._raw_flat)
if self._correct_flat_from_dark:
if self._dark is not None:
flat -= self._dark
else:
logger.debug("No dark. Flat correction using dark skipped")
flat[numpy.where(flat <= 0)] = 1.0
else:
flat = None
self._flat = flat
def process(self):
"""Process source images to all defined averaging algorithms defined
using defined parameters. To access to the results you have to define
a writer (`AverageWriter`). To follow the process forward you have to
define an observer (`AverageObserver`).
"""
self._update_flat()
writer = self._writer
if self._observer:
self._observer.process_started()
if writer is not None:
writer.write_header(self._fabio_images, self._nb_frames, self._monitor_key)
for algorithm in self._algorithms:
if self._observer:
self._observer.algorithm_started(algorithm)
image_reduction = self._get_image_reduction(algorithm)
logger.debug("Intensity range in merged dataset : %s --> %s", image_reduction.min(), image_reduction.max())
if writer is not None:
writer.write_reduction(algorithm, image_reduction)
self._results[algorithm] = image_reduction
if self._observer:
self._observer.algorithm_finished(algorithm)
if self._observer:
self._observer.process_finished()
if writer is not None:
writer.close()
def get_image_reduction(self, algorithm):
"""Returns the result of an algorithm. The `process` must be already
done.
:param ImageReductionFilter algorithm: An averaging algorithm
:rtype: numpy.ndarray
"""
return self._results[algorithm]
def average_images(listImages, output=None, threshold=0.1, minimum=None,
maximum=None, darks=None, flats=None, filter_="mean",
correct_flat_from_dark=False, cutoff=None, quantiles=None,
fformat="edf", monitor_key=None):
"""
Takes a list of filenames and create an average frame discarding all
saturated pixels.
:param listImages: list of string representing the filenames
:param output: name of the optional output file
:param threshold: what is the upper limit? all pixel > max*(1-threshold)
are discareded.
:param minimum: minimum valid value or True
:param maximum: maximum valid value
:param darks: list of dark current images for subtraction
:param flats: list of flat field images for division
:param filter_: can be "min", "max", "median", "mean", "sum", "quantiles"
(default='mean')
:param correct_flat_from_dark: shall the flat be re-corrected ?
:param cutoff: keep all data where (I-center)/std < cutoff
:param quantiles: 2-tuple containing the lower and upper quantile (0<q<1)
to average out.
:param fformat: file format of the output image, default: edf
:param monitor_key str: Key containing the monitor. Can be none.
:return: filename with the data or the data ndarray in case format=None
"""
# input sanitization
if not is_algorithm_name_exists(filter_):
logger.warning("Filter %s not understood. switch to mean filter", filter_)
filter_ = "mean"
if quantiles is not None and filter_ != "quantiles":
logger.warning("Set method to quantiles as quantiles parameters is defined.")
filter_ = "quantiles"
average = Average()
average.set_images(listImages)
average.set_dark(darks)
average.set_flat(flats)
average.set_correct_flat_from_dark(correct_flat_from_dark)
average.set_monitor_name(monitor_key)
average.set_pixel_filter(threshold, minimum, maximum)
algorithm = create_algorithm(filter_, cutoff, quantiles)
average.add_algorithm(algorithm)
# define writer
if fformat is not None:
if fformat.startswith("."):
fformat = fformat.lstrip(".")
if output is None:
prefix = common_prefix([i.filename for i in average.get_fabio_images()])
output = "filt%02i-%s.%s" % (average.get_counter_frames(), prefix, fformat)
output = "{method_name}" + output
if output is not None:
writer = MultiFilesAverageWriter(output, fformat)
average.set_writer(writer)
else:
writer = None
average.process()
if writer is not None:
fabio_image = writer.get_fabio_image(algorithm)
return fabio_image.filename
else:
return average.get_image_reduction(algorithm)
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