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Make sign stills

Cloned from Carl Borstell's Make Sign Stills.

Borstell's intro

Estimates sign holds for sign videos and outputs overlay stills of the sign

With this script, it is possible to input videos of individual signs for any sign language (in theory), and it outputs an overlay image of the sign that is representative of the sign movements.

The analysis is a rather crude way of estimating hold phases in the sign. It makes use of the OpenCV library for analyzing video frames, the SciPy library for identifying peaks in changes between frames, and the ImageMagick library for generating overlay stills.

As a sign video is given to the script, each frame is analyzed and compared pairwise for changes. The first peak (i.e. a lot of changes between frames) is assumed to be the initial transport movement before the sign starts. The script then looks for negative peaks (i.e. small changes ≈ hold phases) and saves these frames as representative phases of the sign.

Our work

Mostly housekeeping on the script (to turn it into a command-line-application using plac), but also notably:

  • Added a video play method that highlights the detected key frames during playback, which can help in tuning the parameters of the algorithm.
  • Added .gif creation

Getting Started

  1. Clone the repo
  2. Install ImageMagick v6 (there are reports that v7 does nto work with the Wand python bindings
  3. cd to the repo directory, and run pipenv install (or pipenv install --skip-lock to be less strict with version requirements)
  4. run pipenv run python make_sign_stills.py -h to display the help message, which should be enough to get you started.