Figure 7
The image plane was tilted and the camera height was 0.87 m. The location of the picture is the front of the No. 8 student dormitory building at Beijing Jiaotong University [37]. The inset in Figure 7 shows size constancy of visual perception, in this inset there is only one vanishing point “s”. Obviously, the size of a, b, c, d are almost proportionately reduced, which reflects linear property of size constancy, and from this linear property we can calculate depth distances of these trees in the Figure 7.