Figure 5.

Angular size. (a) Angular sizes of the physical traffic sign (red) and house (blue) as function of camera position. The origin of the camera-position scale is given in Figure 2a. (b) Angular sizes of the depicted traffic sign (red) and house (blue) as function of viewing distance of the picture (r_p). The solid blue line shows the angular size of the house in the 36 mm picture of Figure 1a, the dashed blue line that of the house in the 72 mm picture of Figure 1b. (c) Ratio between angular sizes of the physical house and traffic signs shown in (a). (d) Ratio between angular sizes of the depicted house and traffic signs shown in (b). The horizontal solid line shows the ratio in the 36 mm picture and the dashed line in the 72 mm picture.