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Image IO for fable

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FabIO is an I/O library for images produced by 2D X-ray detectors and written in Python. FabIO support images detectors from a dozen of companies (including Mar, Dectris, ADSC, Hamamatsu, Oxford, …), for a total of 30 different file formats (like CBF, EDF, TIFF, …) and offers an unified interface to their headers (as a python dictionary) and datasets (as a numpy ndarray of integers or floats)

Getting FabIO

FabIO is available from PyPI.

Debian/Ubuntu packages, and wheels are available for windows, linux and MacOSX from the silx repository:

Documentation is available at silx.

Transparent handling of compressed files

FabIO is expected to handle gzip and bzip2 compressed files transparently. Following a query about the performance of reading compressed data, some benchmarking details have been collected at fabio_compressed_speed. This means that when your python was configured and built you needed the bzip and gzip modules to be present (eg libbz2-dev package for ubuntu) Using fabio in your own python programs Example:

>>> import fabio
>>> obj = fabio.edfimage.EdfImage("mydata0000.edf")
>>> obj.data.shape
(2048, 2048)
>>> obj.header["Omega"]
23.5

Design Specifications

Name:

FabIO = Fable Input/Output

Idea:

Have a base class for all our 2D diffraction greyscale images. This consists of a 2D array (numpy ndarray) and a python dictionary (actually an ordered dict) of header information in (string key, string value) pairs.

Class FabioImage

Needs a name which will not to be confused with an RGB color image.

Class attributes, often exposed as properties:

  • data -> 2D array
  • header -> ordered dictionary
  • rows, columns, dim1, dim2 -> data.shape (propertiy)
  • header_keys -> property for list(header.keys()), formerly used to retain the order of the header
  • bytecode -> data.typecode() (property)
  • m, minval, maxval, stddev -> image statistics, could add others, eg roi[slice]

Class methods (functions):

  • integrate_area() -> return sum(self.data) within slice
  • rebin(fact) -> rebins data, adjusts dims
  • toPIL16() -> returns a PILimage
  • getheader() -> returns self.header
  • resetvals() -> resets the statistics
  • getmean() -> (computes) returns self.m
  • getmin() -> (computes) returns self.minval
  • getmax() -> (computes) returns self.maxval
  • getstddev() -> (computes) returns self.stddev
  • read() -> read image from file [or stream, or shared memory]
  • write() -> write image to file [or stream, or shared memory]
  • readheader() -> read only the header [much faster for scanning files]

Each individual file format would then inherit all the functionality of this class and just make new read and write methods.

There are also fileseries related methods (next(), previous(), …) which returns a FabioImage instance of the next/previous frame in a fileserie

Other feature:

  • possibility for using on-the-fly external compression - i.e. if files are stored as something as .gz, .bz2 etc could decompress them, using an external compression mechanism (if available).

Supported file formats

  • ADSC:
    • AdscImage
  • Bruker:
    • BrukerImage
    • Bruker100Image
    • KcdImage: Nonius KappaCCD diffractometer
  • D3M
    • D3mImage
  • Dectris:
    • CbfImage (implements a fast byte offset de/compression scheme in python/cython)
    • PilatusImage (fileformat derived from Tiff)
    • EigerImage (derived from HDF5/NeXus format, depends on h5py)
  • ESRF:
    • EdfImage: The ESRF data Format
    • XsdImage: XML serialized image from EDNA
    • Fit2dImage: Fit2d binary format
    • Fit2dmaskImage: Fit2d Mask format
    • Fit2dSpreadsheetImage: Fit2d ascii tables (spread-sheet)
    • LimaImage: image stacks written by the LImA aquisition system
    • SparseImage: single crystal diffractions images written by pyFAI
  • General Electrics
    • GEimage (including support for variant used at APS)
  • Hamamatsu
    • HiPiCImage
  • HDF5: generic format for stack of images based on h5py
    • Hdf5Image
    • EigerImage
    • LimaImage
    • SparseImage
  • JPEG image format:
    • JPEG using PIL
    • JPEG 2000 using Glymur
  • Mar Research:
    • MarccdImage (fileformat derived from Tiff)
    • Mar345Image imaging plate with PCK compression
  • MPA multiwire
    • MpaImage
  • Medical Research Council file format for 3D electron density and 2D images
    • MrcImage
  • Nonius -> now owned by Bruker
    • KcdImage
  • Numpy: generic reader for 2D arrays saved
    • NumpyImage
  • Oxford Diffraction Sapphire 3
    • OXDimage uncompressed or with TY1 or TY5 compression scheme
    • Esperanto format (with bitfield compression)
  • Pixirad Imaging
    • PixiImage
  • PNM
    • PnmImage
  • Princeton Instrument SPE
    • SpeImage
  • Raw Binary without compression
  • Rigaku
    • RaxisImage
    • DtrekImage
  • Tiff
    • TifImage using either:
      • Pillow (external dependency)
      • TiffIO taken from PyMca

Installation

Please see doc/source/INSTALL.rst

Changelog

Please see doc/source/Changelog.rst

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