Visual Coding Framework

A programming environment to develop and test image and video compression algorithms.

Install and configuration

Supposing a Python interpreter and Git available:

  python -m venv ~/envs/VCF  # Only if you want a new environment
  git clone git@github.com:Sistemas-Multimedia/VCF.git
  cd VCF
  source ~/envs/VCF/bin/activate
  pip install -r requirements

Usage

Image coding (example)

  cd src
  python PNG.py encode
  display /tmp/encoded.png
  python PNG.py decode
  display /tmp/decoded.png

Video coding (example)

  cd src
  python MPNG.py encode
  ffplay /tmp/encoded_%04d.png
  python MPNG.py decode
  mplayer /tmp/decoded.avi

Programming

Typically, you will need to develop a new encoding scheme for image or video.

Image Coding

The simplest solution is to implement the methods compressed_img = compress(img) and img = decompress(compressed_img), defined in the entropy_image_coding class interface. Notice that it is not necessary to read img when encoding, nor write compressed_img when decoding. Example: src/PNM.py.

Video Coding

Again, it is necessary to implement the methods None = compress() and None = decompress(), defined in the entropy_video_coding class interface. In this case, because a video usually does not fit in memory, you must read and write the frames in the methods compress() and decompress(). Example src/MPNG.py.