alvinlai/python-lfp-reader

LFP (Light Field Photography) File Reader

LFP (Light Field Photography) File Reader

<https://behnam.github.com/python-lfp-reader>

Provides a Python library and command-line scripts to read Lytro LFP files, and a simple viewer for Lytro LFP Picture files.

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.

This is a pure-Python package and should work on any platform. Please report any problems at <https://github.com/behnam/python-lfp-reader/issues>.

LFP File Format

LFP is a new file format used in Lytro Light Field cameras for the RAW and Processed picture files, as well as storing camera information in the Lytro Desktop library.

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 Scripts

This package provides the following command-line scripts:

lfp_file_info.py

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

./lfp_file_info.py samples/IMG_0003.lfp

You may also pass the sha1 id to the command line to get the content of the data chunk in standard output.:

./lfp_file_info.py samples/IMG_0001.lfp sha1-992ae2d9f755077e50de7b9b1357e873885b3382

lfp_picture_info.py

Provides detailed information about a picture file.::

./lfp_picture_info.py samples/IMG_0003.lfp

The Frame section provides the information about the RAW picture data, and the RefocusStack section provides the information about the processed image data, including the number of JPEG files and the size of the depth table. You will also get a preview of the depth table.

lfp_storage_extractor.py

This script provides easier access to embedded files of LFP Storage files. Providing the name of the data file, you get the list of files embedded.:

./lfp_storage_extractor.py data.C.0

If you give the script a path, you get the content of that specific file in the standard output.:

./lfp_storage_extractor.py data.C.0 'C:\CALIB\WIFI_MAC_ADDR.TXT'

lfp_picture_viewer.py

There is also a small application to view and refocus LFP Picture files. You may provide the name of the Processed LFP Picture file in the command-line.:

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

NOTE: This script requires Python Imaging Library (PIL) to run.

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 JPEG data and the depth table. And for LFP Storage files, you can access embedded files easily using their pathname.

The main classes in the lfp_reader package are:

• LfpGenericFile
• LfpPictureFile
• LfpStorageFile

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 <http://www.gnu.org/licenses/>.

Legal Notice

This project is NOT affiliated with LYTRO, INC. Lytro (R) is a trademark of LYTRO, INC. <http://www.lytro.com/>

Some of this work is based on Nirav Patel's lfptools project and his analysis on LFP file format. <https://github.com/nrpatel/lfptools>

Copyright (C) 2012 Behnam Esfahbod. <http://behnam.es/>