5 Advanced

The MGT contains several more advanced analysis features, some with limited documentation, and several still in development. We will here look at some of them.

Optical Flow

Optical flow is a different motion estimation method, which looks at whether pixels change and how directions they change. Thus a motion video created with optical flow can also show motion vectors.

mgmotion('dance.avi','OpticalFlow');

The downside to this is that it is much more computationally heavy than plain frame differencing.

Motion magnification

Eulerian Video Magnification is a method for amplifying parts of the image that are seemingly "invisible". It requires quite some fine-tuning of the parameters to work properly. Try, for example:

mg = mgvideomagnify('standstillcrop.avi','IIR',0.4,0.05,10,16,0.1);

or

mg = mgvideomagnify('standstillcrop','Butter',3.6,6.2,60,90,30,0.3)