PyRLGR

Run Length Golomb Rice

A Python port of the Adaptive Run Length Golomb Rice encoding algorithm.

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Prerequisites

Linux, macOS

• Compiler with C++11 support
• CMake >= 2.8.12

Windows

• Visual Studio 2015
• CMake >= 3.1

Installation

Just clone this repository and install via pip. Note the --recursive option which is needed for the pybind11 submodule:

git clone --recursive <git clone URL>
pip install .

With the setup.py file included in this example, the pip install . command will invoke CMake and build the pybind11 module as specified in CMakeLists.txt.

Note: We recommend the usage of a virtual environment:

python3 -m venv venv
source venv/bin/activate

Note: Uninstall via:

pip uninstall pyrlgr

Pybind11 Example

import pybind11_example
pybind11_example.add(1, 2)

Python Unit Tests

Python unit tests are done using Python's built-in unittest module. Python unit tests live in the tests folder. As long as all of your files match 'test*.py', unittest will automatically discover them. Run python3 -m unittest discover [--verbose] to run all unit tests.

C++ Unit Tests

C++ unit tests are done using Catch2 (https://github.com/catchorg/Catch2). C++ unit tests live in the tests folder. The tests executable can be built with CMake. On Linux/macOS use the following commands to build the tests executable:

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
make --jobs

This will leave the tests executable under build/tests/tests.

Credits

RLGR Algorithm

For a more technical/scientific description of RLGR, you may want to have a look at:

H. S. Malvar, "Adaptive run-length/Golomb-Rice encoding of quantized generalized Gaussian sources with unknown statistics," Data Compression Conference (DCC'06), 2006, pp. 23-32, doi: 10.1109/DCC.2006.5. 

Original C++ implementation

Taken from the RATH implementation of the Digital Image and Video Processing Group in Brasil: https://github.com/digitalivp/RAHT

Who do I talk to?

Christian Rohlfing <rohlfing@ient.rwth-aachen.de>

Thibaut Meyer <thibaut.meyer@ient.rwth-aachen.de>