Object Highlighter
A command line program that will allow users to highlight objects in a video (.mp4 supported) and then watch as the objects are tracked through the video.
Building
The program can be built using either make or cmake.
Make will produce an executable named ‘main’ in the build directory; while Cmake can be run from the build directory itself to produce the executable named ‘ObjectHighlighter’.
Running
The program takes 3 arguments: A required video file and optionally an output file and format for video writing.
Algorithm
The main program runs and creates an ObjectHighlighter object. Within the ObjectHighlighter, I create 4 main entities:
- 3 threads that run the main pipeline of the program:
- A frame reader to get the next frame from the given video
- A thread to update all the trackers
- An output thread that either displays a video or saves+displays a video
- A ControlNode which maintains the state of the ObjectHighlighter and protects resources from multi-threaded race conditions with mutexes and atomics
Performance
The ObjectHighlighter currently supports 16 threads for processing trackers as this is the most expensive portion of the pipeline (performance analyzed with std::chrono and Valgrind). These threads live in a threadpool to avoid spooling/teardown.
Sample Video Highlighting
