An interactive program that visualizes optical flow. Created using Processing 3.

Run the sketch's main file, WebcamFlow.pde, with processing-java.

There are several keyboard bindings to change some parameters at run time:

• LEFT ARROW - decrease flow linger
• RIGHT ARROW - increase flow linger
• DOWN ARROW - reset flow linger to 0.5
• D - toggle debug view
• R - reset flow map and display
• F - flip horizontal
• M - cycle display mode
• B - toggle bilinear interpolation (can only be disabled for display modes not using GLSL)

If only a black screen is shown on startup, it may help to refresh the canvas by pushing D twice to toggle the debug view on then off.