Calibration

Received the new IR Leds, $0,75 each so it was time to get started with the calibration rig. However I did not really like the design so I created a new one:


I'm still not 100% happy with it as I would like to include a battery holder into the design but for now it will do. You can download the STL file to 3D print it from here: Putpi Cali V6

Using it is easy. You mark the spot for the ball and place the putter in that position with the correct lie and no shaft lean. Make sure that the face is pointing towards the target, you can use a laser pointer for that. Next the calibration rig is placed against the putter face.

In the software you start the calibration routine. The calibration routine will now measure the position and 3D orientation of the calibration rig. By doing this it can correctly establish how the camera is orientated in relation to the putting line. You then remove the calibration rig and power-on the Marker clip and let the software measure the clip. That's it. The software now knows everything it needs to know in order to correctly measure the putter stroke.

To explain the difference. The following is the measurement of 3 putter strokes. It represent the x/z data (in mm). X being horizontal (left / right direction ) and Z depth (backward / forward direction).


Next image displays the same 3 putter strokes but now the strokes are recalculated using the calibration rig measurement. The calibration rig was oriented differently for each of the three putter strokes.

Conclusion

This project started to improve the TOMI, making it possible to run it on the newer Windows platforms, with improved precision and accuracy, with faster data collection. I think these goals are meet and that all for a sub US $ 35.- price. (without shipment costs and the 3D printed parts)