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Screen
L and R are homologous image points delivered at screen by projector(s).
Image-selecting viewers
Fig. 1. Construction of a space image point (/) from optical image points, L and R. A spectator's eyes, EL, ER, having a lateral separation, t, are equipped with selecting viewers and regard, respectively, left and right corresponding image points, L and R. These are separated on the screen by a parallax, zs, which may be positive or negative. The spectator, distant Ffrom the screen, will see the fused image point, 7, at the intersection of the rays from EL to L, and ER to R. His distance from / is denoted by P.
the letter z, a subscript being added to distinguish the kind of parallax referred to. Thus a screen parallax is zs, a parallax on the projected film zp, a parallax introduced by displacement in the optical printer zd, and a parallax originating in the camera zc.
Three special cases are shown in Fig. 1 ; (a) that in which zs = t, for which rays of light are reflected parallel from the screen, so that the image point is placed at infinity; (b) that in which zt = 0, in
which the point is imaged in the plai of the screen (whence it follows that a normal flat film is merely a special case of the 3-D film, that in which zs = 0 for all image points) ; and (c) that in which zg = —t, and the image, as may be seen from simple geometry, is halfway out to the spectator.
From previous theoretical discussion, the impression has got around that stereoscopic projection is extremely complicated, requiring special and often vari
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October 1952 Journal of the SMPTE Vol. 59