To realize the cyber space that exists only in the computer, a
geometric method for a holographic stereogram is proposed. In the calculation
of the binocular parallax angle, some additional distance that is
not real is considered. Considering the magnification of the projected
images, the binocular parallax angle is calculated and horizontalparallax-
only (HOP) holograms are made. This method is applicable to
both flat and cylindrical stereograms.