Natural scene statistics predict how humans pool information across space in surface tilt estimation
Fig 1
3D surface orientation is fully described by slant and tilt.
Slant is the angle indicating how much a surface is rotated out of the fronto parallel plane. Tilt is the direction of slant, as quantified by the angle between the x-axis in the frontoparallel plane and the surface normal projected into the frontoparallel plane. A Signed tilt, defined on [0°,360°), and unsigned slant. B Unsigned tilt, defined on [0°,180°), and signed slant.