What exactly is structure/"scene geometry" referring to here?
motoole2
The column, "structure (scene geometry)", refers to knowing the 3D shape of a scene. For example, calibration targets have known shape (e.g., a corner cube, or a checkerboard), and are particularly useful for camera calibration.
For example, for a checkerboard calibration target, we would physically measure the size of the squares with a ruler, and determine the 3D positions of the square corners to be
at 3D position $(x,y,0)$ (where we assume $z = 0$, since all the points lie on a plane). After taking photos of the checkerboard calibration target in a number of different poses, we can compute the correspondences between 3D points on the checkerboard and corresponding 2D pixels on the sensor.
What exactly is structure/"scene geometry" referring to here?
The column, "structure (scene geometry)", refers to knowing the 3D shape of a scene. For example, calibration targets have known shape (e.g., a corner cube, or a checkerboard), and are particularly useful for camera calibration.
For example, for a checkerboard calibration target, we would physically measure the size of the squares with a ruler, and determine the 3D positions of the square corners to be at 3D position $(x,y,0)$ (where we assume $z = 0$, since all the points lie on a plane). After taking photos of the checkerboard calibration target in a number of different poses, we can compute the correspondences between 3D points on the checkerboard and corresponding 2D pixels on the sensor.