dense_optical_flow

Dense optical flow detection using OpenCV's Gunnar Farneback’s algorithm. An example is included: taking a video showing a crowd in movement, the people movement can be described with a set of vectors.

#acceleration#cmake#cpp#farneback-algorithm#opencv#video

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Dense Optical Flow

Dense optical flow matrix using OpenCV's Gunnar Farneback’s algorithm.

Compilation

cd src
mkdir build && pushd !!
cmake ..
make
popd

Usage

./main VIDEO_FILE.mp4

Output sample

ACCELERATION=0.1
ACCELERATION=0.9

Tools

ffmpeg -y -i KTH-Final-0TbZXdhqvA.mp4 -ss 50 -vf eq=brightness=-0.3:contrast=-0.5:saturation=0.5,scale=800:-1 -an KTH-Final-0TbZXdhqvA-640.mp4
ffmpeg -y -i 2020-05-12_08-14-26.mp4 -filter:v "crop=760:420:0:0" out.mp4; mplayer out.mp4

Credits

Video cut from Richard Ristic, https://www.youtube.com/watch?v=-0TbZXdhqvA; the video has been processed to decrease brightness in order to make the rows more visible. Will be removed if the author asks for.
See also https://github.com/gti-upm/FFME