Specification of calibrated camera rotation about opf-spec

[krahenbuhl]

Dear Paul,

Thank you for your kind words and your valuable feedback. We appreciate your support for the OPF initiative and your interest in enhancing the specification!

Regarding your question about using quaternions instead of Euler angles for expressing rotations, we carefully considered different alternatives during the design process of the OPF specification. While we understand that quaternions have certain advantages (avoiding gimbal lock and simplifying the concatenation of rotations), we opted to use Euler angles for several reasons.

One of the main considerations was the balance between simplicity and practicality. Euler angles are widely understood and used in the field of photogrammetry, making the specification more accessible to a broader range of users. Additionally, Euler angles can be easily converted to and from other rotation representations, including quaternions, allowing users like yourself to convert the rotations as needed in your specific applications.

We acknowledge that Euler angles may have some limitations, particularly when dealing with rotations near singularities, but for the majority of applications, they provide a straightforward and effective way to represent camera rotations within the OPF framework.

We appreciate your input and invite further discussion on this topic. Your feedback helps us refine and improve the OPF specification, ensuring its usability and effectiveness within the photogrammetry community.

Thank you once again for your support, and please feel free to reach out if you have any more questions or suggestions.