Patent ID: 11941851
Assignee: nan
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. A method comprising:
obtaining a first image of a first point in a three-dimensional space and a second image of a second point in the three-dimensional space, using an imaging sensor at a first orientation;
obtaining a third image of the first point and a fourth image of the second point, using the imaging sensor at a second orientation;
obtaining a first output and a second output of a spatial orientation sensor when the imaging sensor is respectively at the first orientation and at the second orientation;
determining a focal length of the imaging sensor based on the first image, the second image, the third image, the fourth image, the first output and the second output;
wherein the imaging sensor and the spatial orientation sensor have fixed orientation with respect to each other;
wherein the first output and the second output of the spatial orientation sensor respectively represent the first orientation and the second orientation relative to a reference frame.