资源说明：LFP (Light Field Photography) File Reader in Python

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LFP (Light Field Photography) File Reader
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*Version 2.0*

Provides a Python library and command-line scripts to read Lytro LFP files.
There is also an enhanced viewer for Lytro LFP Picture files supporting
light-field picture refocusing and enhanced-depth-of-field/parallax view.

This version supports picture files generated by
*Lytro Desktop application version 2.0*.

Technically, there are two types of LFP files: Picture and Storage.  LFP
Storage files are used to store the data and configurations for Lytro cameras,
and LFP Picture (.lfp) files are used to store RAW and/or processed data for
Lytro light-field pictures.


How to Install
==============

Dependencies
------------

This is a pure-Python package and should work on any platform, but some
functionalities depend on external Python and non-Python libraries.

- Python Imaging Library:
  ``PIL`` (http://pypi.python.org/pypi/PIL) or
  ``Pillow`` (http://pypi.python.org/pypi/Pillow/).

- GStreamer Python:
  ``gstreamer``, ``gst-python`` and the ``gst-plugins-ugly`` plugin set
  (http://gstreamer.freedesktop.org/modules/).

Install in Ubuntu
-----------------

Run following commands in a terminal::

    sudo apt-get install libjpeg-dev python-gst0.10 gstreamer0.10-plugins-ugly python-pip

    sudo pip install https://github.com/behnam/python-lfp-reader/tarball/master


LFP File Format
===============

*LFP* is a new file format used by *Lytro Cameras* and *Lytro Desktop* app for
RAW and Processed picture files, as well as storing camera software and
information.

**LFP Picture** files have a ``.lfp`` extension, and among these, the name of
the processed picture files end in ``-stk.lfp``, where *stk* stands for
refocuse "stack".  Embadding JPEG data with some additional refocus data, the
``stk.lfp`` files are designed to be used in the Lytro Desktop application and
on the web.

**LFP Storage** files embed various data files, which are identified by a
pathname, i.e. ``C:\CALIB\WIFI_MAC_ADDR.TXT``.


LFP Viewer
===========

**lfp-viewer.py**

  An enhanced light-field picture viewer, suppring *refocus* and
  *enhanced depth-of-field/parallax* features.

  You may provide the name of the Processed LFP Picture file in the
  command-line.::

    ./lfp-viewer.py samples/IMG_0001-stk.lfp


Command-line Scripts
====================

This package provides the following command-line scripts.


lfp-file.py
-----------

**Sub-command: info**

  Prints general information about any LFP file, including the metadata and
  data chunks (their size and sha1 ids).::

    ./lfp-file.py info samples/IMG_0003.lfp

**Sub-command: export**

  Exports metadata and data sections of a generic file into separate files.::

    ./lfp-file.py export samples/IMG_0001.lfp

**Sub-command: extract**

  Extract the content of a data chunk to standard output, giving its SHA1 id.::

    ./lfp-file.py extract samples/IMG_0001.lfp sha1-992ae2d9f755077e50de7b9b1357e873885b3382


lfp-picture.py
--------------

**Sub-command: info**

  Provides detailed information about the LFP Picture file.::

    ./lfp_picture_info.py samples/IMG_0003.lfp

  The *Frame* section provides the information about the RAW picture data.

  the *Refocus-Stack* section tells you about the processed image data for
  refocues feature, including the number of refocues images and the size of the
  depth table.

  the *Parallax-Stack* section tells you about the processed image data for
  EDoF/Parallax feature, including the number of parallax images.

**Sub-command: exporter**

  Exports raw, processed data and an all-in-focus image of the LFP Picture file
  into separate files.::

    ./lfp_picture_exporter.py samples/IMG_0001.lfp
    ./lfp_picture_exporter.py samples/IMG_0001-stk.lfp


lfp-storage.py
--------------

**Sub-command: info**

  Prints general information about any LFP Storage file, including a list of
  embedded data files (their path and size).::

    ./lfp-storage.py info samples/IMG_0003.lfp

**Sub-command: export**

  Exports metadata and embedded files of an LFP Storage file into separate files.::

    ./lfp-storage.py export samples/IMG_0001.lfp

**Sub-command: extract**

  Extract the content of an embedded file to standard output, giving its path.::

    ./lfp-storage.py extract samples/IMG_0001.lfp "C:\\CALIB\\ACC.TXT"


LFP Reader Library
==================

**LFP Reader library (``lfp_reader``)** provides direct reading access to all
data and metadata in any LFP files. For the processed LFP Picture files, you
can easily access the refocused and parallax data and the depth table. And for
LFP Storage files, you can access embedded files easily using their pathname.

For more details, look at the module documentation.


Code License
============

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 .


Legal Notice
============

This project is NOT affiliated with LYTRO, INC.  Lytro (R) is a trademark of
LYTRO, INC. 

This project uses GStreamer plugins for H.264 decoding, thus includes no
implementation of H.264 algorithms.

Some of this work is based on Nirav Patel's ``lfptools`` project and his
analysis on LFP file format.  

Copyright (C) 2012-2013 Behnam Esfahbod. 

Please report any problems at .

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