Checkerboard calibration enables more flexible camera placement when using Uplift Capture—especially in difficult or obstructed capture environments— eliminating the requirements to keep the cameras at perfectly 90 degrees offset. While calibration improves setup flexibility, there are still some prevailing guidelines for placing the two devices to ensure a complete and accurate capture.
1. Place each device so that the athlete's entire body, and any implements (such as a baseball bat), are visible in both camera frames for the entirety of the movement.
The biggest impact to accuracy is when joint centers are occluded (blocked from view) through parts of the movement in one or both cameras. Also, if any body parts are out of frame during the movement, we can't guarantee an accurate estimate of its position.
3. Avoid setups where cameras are directly across from, or directly next to one another.
These setups will increase the chances of joint occlusion. In addition, the calibration will not actually complete if the cameras are across from one other since they will not both be in view of the checkerboard.
Examples of good capture setups:
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Examples of bad capture setups:
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