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tszheichoi / awesome-sensor-logger

Collection of tools, resources and sample code to use alongside the Sensor Logger app
MIT License
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Questions about quaternions recorded by headphones and watches #41

Closed LannnSun closed 5 months ago

LannnSun commented 5 months ago

Thank you very much for your excellent work. I have a question about quaternions. The local coordinate system of the iPhone is set according to the phone screen. When I open Standardize Units & Frames, the local coordinate systems of the phone, watch, and headphone are aligned. Are they aligned to the local coordinate system of the mobile phone? Does it mean that the acceleration and angular velocity output of the watch and earphones are expressed in the local coordinate system of the mobile phone? What do the quaternions of watches and headphones represent?Looking forward to your reply, thank you very much!

tszheichoi commented 5 months ago

They have their own local coordinate systems. You can see what they look like here https://github.com/tszheichoi/awesome-sensor-logger/blob/main/COORDINATES.md

tszheichoi commented 5 months ago

Closing this now, let me know if you run into further issues.