Three-Dimensional Photography - Principles of Stereoscopy

86 THREE-DIMENSIONAL PHOTOGRAPHY

zontal distances separating the two images of the various objects

of Fig. 5-4 (homologous distances). Figure 5-8b shows the disposi-

tion of these homologous points in the untransposed stereogram,

while Fig. 5-8a shows the homologous distances of the transposed

image. Notice that the distance between points A-A is the least of

all and that as the original distances of the objects increase, the

separation also increases.

In the finished stereogram the distance between homologous

points is directly related to the distances of the original objects

Fig. 5-9. The Window (A). This is the conventional window, placed

nearer the eyes than the flower. The flower spacing is constant in all

examples, so the spacing of the mask shows the variation which places

the window at diflerent distances.

Fig. 5-10. The Window (B). Here the window is in the plane of the
tip of the stamen of the flower.