GB514426A - Improvements in and relating to methods of presenting stereoscopic pictures - Google Patents

Abstract

514,426. Stereoscopic photographs. DUDLEY, L P. April 1, 1938, No. 10061. [Classes 97 (i) and 98 (ii)] In. order that a parallax stereogram shall present a stereoscopic effect independently of the point of view, some of the-vertical left and right eye strip elements of-the stereogram, or a portions of these elements, are displaced laterally with respect to the remainder, and a normal viewing screen'with vertical spaced lines is employed, so that over a wide angle of view a partly stereoscopic and partly pseudoscopic effect is obtained. The former effect predominates, and is sufficient to give a correct three-dimensional appearance'. Alternatively, a normal stereogram may be used in conjunction with a screen in which some, or parts of the vertical lines are displaced laterally. Fig. 6, shows one form of stereogram in which the normal right and left eye vertical strip picture elements r, l have been shifted laterally through the width of one element in alternate horizontal bands, so that portions 'of each element will be seen by the correct eye when viewed from any normal position through a screen of vertical lines. Fig. 8 shows one form of grid for viewing a normal stereogram in which half the lines have been moved laterally 'through a distance equal to the width of one space, and Fig. 10, shows another form divided by a curved boundary into upper and lower areas, the lines in each of which are a prolongation of the spaces in the other. The modified stereograms may be produced by taking them or projecting them through a suitably modified screen, and may be used in conjunction with a kinematograph camera or with television transmitters or receivers.