Mixed Signature: An Invariant Descriptor for 3D Motion Trajectory Perception and Recognition

<table>Central symmetry trajectory with <svg height="11.6375" id="M38" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 18.200001 11.6375" width="18.200001" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.362)"><use xlink:href="#x394"></use></g><g transform="matrix(.017,-0,0,-.017,10.959,11.362)"><use xlink:href="#x1D45F"></use></g>
</svg> and <svg height="11.6375" id="M39" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 17.4 11.6375" width="17.4" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.362)"><use xlink:href="#x394"></use></g><g transform="matrix(.017,-0,0,-.017,10.959,11.362)"><use xlink:href="#x1D460"></use></g>
</svg> in corresponding segments. Arrows show the left-hand helix in both parts.</table>

Mathematical Problems in Engineering

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Figure 8

Figure 8: Mixed Signature: An Invariant Descriptor for 3D Motion Trajectory Perception and Recognition 