This addon features a class that can determine the rotational velocity of a vector when given it's position relative to the center of a circle. When used in conjunction with optical flow, it can be useful for projects in need of rotation sensing from a live feed or recorded video.
If you are curious about the math behind this addon, or would like to see a clip of the example project in action, check out this blog post.
ofxRotationSensing is distributed under the MIT License.
Download this repo and drop the folder into the
ofxGui / ofxOpenCV / ofxOpticalFlowFarneback
Developed and tested in openFrameworks v0.9.3. Tested in v0.9.4. All other versions are untested.