How to get Yaw, Pitch, Roll?

[mohammad-saber]

Thank you very much for sharing your great work.
Is there any way to get Yaw, Pitch, Roll of of head?

[JianliZh429]

Sorry for replying to you so late, I hadn't been doing the work for months. As shown by the image below, if we assume that there's a three-dimensional coordinate in the head position, and the origin is at the nose position, the axis X points right towards the observer, the axis Y is horizontal, the axis Z points up, so, Yaw represents the degree in the xy-plane, Pitch represents the degree in the xz-plane, Roll represents the degree in the yz-plane.

Hope it can help you. You can also see the PnP algorithm to get more details.

1. https://en.wikipedia.org/wiki/Perspective-n-Point
2. https://docs.opencv.org/4.5.2/dc/d2c/tutorial_real_time_pose.html