Method and system for determining spatial coordinates of a 3D reconstruction of at least part of a real object at absolute spatial scale

A non-transitory computer readable medium comprising computer readable code for determining spatial coordinates of a 3D reconstruction of at least part of a first real object, the computer readable code executable by a processor to:

• obtain, from a first camera system, a first image comprising at least part of a first real object;
• obtain, from a second camera system, a second image comprising at least part of a second real object associated with known geometric properties, wherein the first camera system and the second camera system have a known spatial relationship;
• determine a scale of at least part of the face based on the second image and the known geometric properties of the at least part of the second real object;
• determine a pose of the second camera system based on the determined scale of the at least part of the second real object;
• determine a pose of the first camera system according to the pose of the second camera system and the known spatial relationship;
• and
• determine, based on the pose of the first camera system and the scale of the at least part of the second real object, spatial coordinates of a 3D reconstruction of the first real object.

A system for determining spatial coordinates of a 3D reconstruction of at least part of a first real object, comprising:

• a first camera system;
• a second camera system having a known spatial relationship with the first camera system;
• one or more processors;
• and
• a computer readable medium comprising computer readable code executable by the one or more processors to:
• obtain, from the first camera system, a first image comprising at least part of a first real object;
• obtain, from the second camera system, a second image comprising at least part of a second real object associated with known geometric properties;
• determine a scale of at least part of the face based on the second image and the known geometric properties of the at least part of the second real object;
• determine a pose of the second camera system based on the determined scale of the at least part of the second real object;
• determine a pose of the first camera system according to the pose of the second camera system and the known spatial relationship;
• and
• determine, based on the pose of the first camera system and the scale of the at least part of the second real object, spatial coordinates of a 3D reconstruction of the first real object.