|semi-hologrammic video is a viably present and attainable technology|
[topically related to progressive resolution for image-cruising on bandwidth-restricted information connections; to television's original NTSC concept; and to 2-CCD Stereo-eyes-ed HDDV camera]
The present video technology supplies successive images on a near-flat display screen - the resulting image is near-flat, and at that same depth perception. But conceivably this near-flat image can be topologically depth-shaped: without changing the normal video-scan operation, merely its perceived depth.
Consider each point in a binocular line-pair of vision: most points are seen in both lines - though not the same angle, that determines the apparent depth - while points stereoscopically half-hidden behind the edge of a foreground opaque object are seen in only one line. (Points behind transparencies and translucencies may have jumbled and unequal blurred focal lines)
But, each point in view may be represented by a fairly simple function of its stereoscopic position-of-origin: its consequent angle of focal dispersion, and a masking start-stop function, for maintaining object edge opacity as needed, kept fairly simple: one foreground object, slow-scanned (low signal bandwidth). Exceptions to this paradigm include primarily multi-planed views through windows: a window reflects images of the viewer and behind, upholds dust, smears, film or drawn images, on its surface, near, and opens to the view, room, case, beyond: three significant perceivable image depths - but a director of video may choose for the vidience [audience], near, mid, far.
A stereo-eyes-ed display can be constructed fairly simply from a parabolically fast-warping array of multilenticular micro-elements (transmissive or reflective) - and a position-indexed edging-mask - this is called, flood-focused (raster-contour-scanned), because the whole display screen assists in constructing each point-in-view: But the technological cost is practicably low: the micro-elements are uniformly arrayed, and interconnected to produce an electronically tilted (fresnel-articulated) parabolic lens: an inexpensive proposition.
Stereo-eyes-ing image processing, video-data signal preparation, may be the more expensive, but computational: One example is a stereo-separated pair of polarization homogenizing (micro-scrambling) pre-filters into same-polarized (vertical) pre-filters, then cross-diagonal-polarized left-right distinguishing filters, a fixed stereo-combining mirror system (with partial-mirrors), through a common zoom assembly, split again by fixed polarized mirrors, to fixed individual photon receptor arrays, left and right. Alternatively, a single HDDV imager with a pair of (color-emphasized) monochrome ranging imagers, may suffice.