481054.fig.004a
(a)
481054.fig.004b
(b)
481054.fig.004c
(c)
481054.fig.004d
(d)
Figure 4: Four additional symmetry-breaking albedo patterns were employed. In all cases, the sensor was placed in the orientation at the center of the pattern, indicated by . In the two lower patterns, the center of the white square was shifted diagonally from the center by 4 mm as indicated by the coordinates (white text) of the corner. The recorded intensity levels are displayed in the white albedo area.