5. Hemispherical projection

A few attempts have been made to project images onto a hemispherical screen in order to give a group of spectators, gathered in the center of a dome, the illusion of vision in the total field [63][64] . In general, the images are recorded by a 180° lens and occupy a circular position on the film, within which they are affected by spherical perspective distortion; this distortion is compensated for when projected onto a hemispherical dome [65] . CST points out that in this case, the viewer is immersed in the image, i.e. his or her visual field is totally occupied by the projected image. Experience has shown that the physical and intellectual fatigue caused is not conducive to the broadcasting of long programs,...