Abstract
The invention relates to stereo projection systems for displaying stereopaired images on mirror-spherical or parabolic screens and for collectively watching a stereo effect without using stereo spectacles. Said invention makes it possible to continuously dynamically superimpose the projections of the left and right picture frames of a steropair with the user's left and right eyes, respectively. Such impositions are carried out simultaneously and independently for each viewer. The technical result is attainable by that the inventive stereo projection system comprises stereo projectors which are individually allocated to each viewer and in-series connected, a monitoring system for continuously and accurately determining the viewers' eye positions, a self correcting device, video-correcting devices, automatic drives for the mechanical self-correction of the stereo projectors and the system optical elements, units which are used for forming stereopair projected images in the stereo projector and which are coupled with the video-correcting device for the video-correction of the optimal parameters of the screen images. The inventive system makes it possible to carry out the self- and video-correction in an integral manner in such a way that the comfort of the stereo effect viewing is maximally satisfied.
Claims
1. A stereoscopic projection system for glasses-free viewing of horizontal stereo pairs images on a screen comprising: a reflecting and focusing stereoscreen, a stereoprojector comprising a projection unit for forming stereo-pair frames, and a projection lens for the projecting stereo-pair frames onto the stereoscreen, thereby forming the stereo pair images; a tracking system for monitoring of the eyes and the pupils of the eyes of the viewer, and a video corrector wherein the tracking system is connected with the video corrector and adapted to perform a continuous monitoring of position data of the eyes of the viewer to determine exact coordinates of the eyes and pupils of the eyes for determining the viewers' ocular convergence and fixation point in their visual field, and wherein the video corrector is connected with the projection unit and capable of correcting displacements of frame centers of the projected stereopair frame images by optimal stereobases for harmonizing of horizontal parallaxes with the fixation point and viewer's ocular convergence.
2. A stereoscopic projection system as defined in claim 1, further comprising an auto-corrector connected with the tracking system for dynamic automatic displacements by auto-drives of optical systems of projection magnification for auto-focusing with consideration of the viewers' ocular convergence and fixation point.
3. A stereoscopic projection system as defined in claim 1, further comprising an auto-corrector connected with the tracking system for dynamic automatic displacements of the stereoprojector by auto-drives along any coordinate axis of three-dimensional space and/or rotation by the auto-drives around these axes, wherein displacements by the auto-drives of projection lenses of a stereoscopic lens assembly or of the optical systems of projection magnification by a calculated stereobase width are for auto-focusing or aperture adjustment or for convergence of the projection optical axes with consideration of the viewers' ocular convergence and fixation point, and wherein the video corrector is connected with the tracking system through the auto-corrector.
4. A stereoscopic projection system as defined in claim 1, wherein the projection unit comprises: movable matrices or movable projection units for forming and optimal orientation of frames of the projected stereopair relative to projection lenses; and auto-drives for displacement of the matrices along their vertical and horizontal axes, for rotation of the matrices around their vertical axes or displacement of the projection units with reflecting screens inside the stereoprojector around their vertical axes, and for auto-focusing of these projection units inside the stereoprojector.
5. A stereoscopic projection system as defined in claim 1, wherein the stereoscreen is flat with micromirror raster focusing stereoprojections in the fixation point in the viewer's visual field of the eye pupils, wherein projectors of the left and right eyes are located closer to the stereoscreen edge, for displacement of one fixation point stereovision zone for different stereobases and ocular convergence, wherein the stereoscreen includes a first screen part movable relative to a second screen part, wherein the left zone projector for the left frame of the stereopair is fastened on the first screen part, and the right zone-projector for the right frame of the stereopair is fastened on the second screen part, wherein the first and second parts are mounted on auto-drives connected with the auto-correctors for movements along the coordinate axes and rotation of the stereoscreen around these axes, and wherein the first screen part of the stereoscreen is mounted on the auto-drive with an auto-corrector of the horizontal displacement of the first screen part of the screen for dynamic alignment of the focal zones of left and right frames of the stereopair with the pupils of the corresponding eyes.
Description
BRIEF DESCRIPTION OF DRAWINGS
(1) FIG. 1 shows a frontal aspect of the functional scheme of a stereoscopic projection system for cinema with auto-correction of optical elements of the system.
(2) FIG. 2 shows design of a stereoscopic projection system with a stereoscreen suspended on the ceiling in inclined position.
(3) FIG. 3 shows design of a stereoscopic projection system with a stereoscreen suspended on the ceiling in horizontal position.
(4) FIG. 4 shows plane of optical scheme of dynamic auto-correction for orienting of optical elements of the system.
(5) FIG. 5 shows flow chart of a stereoscopic projection system with auto-correction of optical elements of the system.
(6) FIG. 6 shows design of a stereoprojector with two inner projectors and oriented reflecting screen.
(7) FIG. 7 shows design of a stereoprojector with a matrix display and lens raster.
(8) FIG. 8 shows design of a stereoprojector with DLP (micromirror) matrix and two illuminators orienting projections.
(9) FIG. 9 shows flow chart a stereoscopic projection system with desk top stereoprojector of collimated beams.
(10) FIG. 10 shows design of stereoscopic projection system with a desk top and reflecting spherical mirror.
(11) FIG. 11 shows design of a stereoscopic projection system with a reflecting spherical notebook monitor.
(12) FIGS. 12 and 13 show design of a head mounted stereoprojection system with a reflecting spherical screen in the form of glasses.
(13) FIG. 14 shows design of a stereoscopic projection system with movable flat mirror raster screen.
(14) FIG. 15 shows design of a suspended stereoscopic projection system with movable reflecting spherical stereoscreen.
MODES FOR CARRYING OUT THE INVENTION
(15) FIG. 1 shows a stereoscopic projection system intended for cinema, theaters, video theaters, concert halls, studios, gymnasia, conference rooms, and other video halls with a large number of viewers (50-500 persons). A big reflecting spherical stereoscreen 1 with surface of 10-100 m.sup.2 and mirror sphere radius R.sub.s (10-40 m) is fast mounted on the auto-drives 2. S.sub.s—an apex of the stereoscreen reflecting sphere radius. M.sub.s—programmed center of the stereoscreen reflecting sphere, R.sub.s—radius of this sphere, S.sub.s—pole of this sphere. Above the stereoscreen on a hanged bracket a tracking system 3 is mounted with left 4.sub.l and right 4.sub.r video cameras for monitoring of the viewers' eyes position. In the point M.sub.s an auto-collimator 5 is mounted for monitoring of orientation of the stereoscreen reflecting sphere. In front of the stereoscreen above the viewers stereoprojectors 6 are mounted (one for each viewer) with movable projection lenses 7, projections units 8 for forming the projected stereopair frames in the stereoprojectors and auto-drives 9 for auto-correction of optical elements in the stereoprojectors. The stereoscreen with mirror surface more than 0.3 m.sup.2 for high precision of the reflecting sphere can be assembled from a number of spherical reflecting sections (0.25-0.5 m.sup.2). The system comprises auto-correctors 10 connected with the tracking system 3, auto-drives 2 and 9, video correctors 11 and auto-collimator 5. The viewers, stereoprojectors and their elements, as well as the stereoscreen or its reflecting spherical sections can move along the coordinate axes x, y and z and be rotated around these axes at angles α.sub.x, β.sub.y and γ.sub.z by the auto-drives. Angles ω—incidence angles of the projecting beams a1, a3 emitted by the stereoprojector onto the screen and beams a2, a4 reflected by the stereoscreen in the viewers' eyes. Arrow b.sub.l shows the beams of the viewers' images registered by the left video camera 4.sub.l of the tracking system 3; arrow b.sub.r shows the beams of the images registered by the right video camera. Arrow c shows control signals of the tracking system 3 sent to the auto-corrector 10. The arrow d shows the auto-collimator beams scanning the stereoscreen, arrow e shows control signals from the auto-collimator 5 to the auto-corrector 10, arrow f shows control signals from the auto-corrector 10 to the video corrector 11. Arrow g shows control signals from the auto-corrector 10 to the auto-drives 9 of the stereoprojectors 6, arrow h shows control signals from the video correctors 11 to the units 8 (forming of the projected frames). Arrow i shows control signals from the auto-corrector 10 to the auto-drives 2 of the stereoscreen.
(16) FIG. 2 shows a stereoscopic projection system with the stereoscreen 1 mounted on the suspension bracket. On the suspension bracket a flat semi-transparent mirror 12 is mounted inclined to the projection optical axis (serving as a stereomonitor) on which an image is observed focused by the stereoscreen 1 onto the mirror 12.
(17) FIG. 3 shows a stereoscreen 1 with a flat mirror 12 (stereomonitor); on the mirror 12 an auxiliary flat mirror 13 is suspended. On the stereoscreen 1 the stereoprojector and tracking system 3 are suspended. Under the projection system a working table is installed (or a bad for a sick person in a hospital). This table is separated from the stereoscopic projection system by free working zone. The screen 12 is positioned at 45° to the main projection axis of the stereoprojector 6, while the screen 13 is positioned at 45° to the main projection axis and at 90° to the stereoscreen 12. The screen 13 is intended for vertical deflection of projection in order to clear the working zone over the working table (for carrying out of different works on this table). In the system with the stereoscreen suspended on the ceiling the most part of the projection zone is located vertically or at 45° to the vertical axis. This clears the zone behind the flat screen 12 which provides for a free space or allows to install more projection systems in the room.
(18) FIG. 4 shows position r of the right eye and position 1 of the left eye. O.sub.e—the stereobase center of these eyes. O.sub.s—center of the stereoprojector 6 rotation realized by the auto-corrector. 8—projection unit with a matrix or reflecting mirror for forming of the left frame 8.sub.l and right frame 8.sub.r of the horizontally projected stereopair. Δx—direction of horizontal displacement, Δy—direction of vertical displacement of the stereopair frames in the stereoprojector realized by the auto-corrector or video projector. 7.sub.l—projection lens of the stereoscopic lens assembly for projecting left frame of the stereopair and 7.sub.r—projection lens of the stereoscopic lens assembly for projecting right frame of this stereopair. a1—main (central optical) axes of the stereo projection. a.sub.l—optical axes of projection of the projection lens 7.sub.l, a.sub.r—optical axes of projection of the projection lens 7.sub.r; a2.sub.l—projection beams from the lens 7.sub.l reflected by the stereoscreen 1 in the l—left eye and a2.sub.r—projection beams from the lens 7.sub.r reflected by the stereoscreen 1 in the r—right eye. Δϵ—limit of horizontal displacement of the movable projection lens 7.sub.l realized by the auto-regulator. Δφ—convergence angle of the projection lenses of the stereoscopic lens assembly equal to the angle φ.sub.y of rotation of the lens 7.sub.l optical projection axes around the vertical axes y.
(19) FIG. 5 shows auto-correctors: 9a—for correction of displacements of the stereoprojector 6 along the coordinate axes x, y and z; 9b—for correction of the stereoprojector rotation at the angles α.sub.x, β.sub.y and γ.sub.z (around the coordinate axes); 9c—for auto-focusing of the projection lenses 7.sub.l and 7.sub.r of the stereoscopic lens assembly by means of their displacement at Δf along their optical axes; 9d—for correction of the stereobase (horizontal displacement of this lens along the stereobase line at Δϵ width); 9g—for auto-focusing of the lenses 17.sub.l and 17.sub.r in the projection units 8; 9f—for correction of displacement of the projection units 8.sub.l and 8.sub.r or for displacement of the LCD matrices 8.sub.l, 8.sub.r (forming projected frames of the stereopair) and 9e—for correction of convergence angle Δφ of the stereoscopic lens assembly (angles of inclination of the projection optical axis a.sub.r (lens 7.sub.r) and projection optical axis a.sub.l (lens 7.sub.l). Video corrector provides for electronic and optical video correction of scales and geometrical distortions of the projected frames of the stereopair formed by the matrix 8.sub.l,r or 16 (RGB).sub.l,r. The auto-collimator 5 ensures convergence of the stereoscreen sphere center (or centers of the reflecting spherical sections of the stereoscreen) into the single programmed center M.sub.s by means of the auto-drives 2 and signals k from the auto-corrector 10.
(20) FIG. 6 represents a design embodiment of the unit 8 for forming of the stereopair frames. The unit comprises reflecting screen 14, projection optical units 15.sub.l—for projection of the stereopair left frame onto the screen 14 and 15.sub.r—for projection of the stereopair right frame onto the same screen. The units contain the auto-drives 9e for displacement of the units 15 perpendicularly to the screen 14. The units 15.sub.l and 15.sub.r contain optical units with the LCD RGB-matrices 16 (RGB).sub.l and 16 (RGB).sub.r with illumination of the determined matrix by its light emitting diode in determined foreshortening and of determined color: R—red, G—green or B—blue). The unit 16.sub.l is intended for forming of the left projected frame of the stereopair and the unit 16.sub.r—for the right frame. In front of the screens 14 projection lenses 17.sub.l and 17.sub.r are installed with the auto-drives 9g for auto-focusing of these lenses. The drawing (View A) shows the reflecting screen 14 made with raster 18 consisting of spherical micromirrors for separate orientation of projection beams of the stereopair left frame projected by the unit 15.sub.l in the projections lens 7.sub.l (of the stereoscopic lens assembly) and orientation of beams projected by the unit 15.sub.r in the lens 7.sub.r.
(21) FIG. 7 shows yet another embodiment of the unit 8 for forming of the stereopair frames. The unit comprises a LCD or OLED matrix 19 with lens raster 20 (drawing B) consisting of spherical microlenses. The matrix forms stereopair images as RGB vertical horizontally alternating lanes (RGB.sub.l lines for the left frame and RGB.sub.r lines for the right frame of the stereopair). The color sub-pixels in each line alternate vertically. Each pair of the conjugate lines RGB.sub.l and RGB.sub.r is projected by vertical line of lenses of this lens raster so that images of the pixels RGB.sub.l lines are projected to the projection lens 7.sub.l and pixels of the RGB.sub.r line—in the lens 7.sub.r. On the exit lenses of the projection lenses 7.sub.l and 7.sub.r porous or cross-grating black color filters 21.sub.r and 21.sub.l are installed. for antiglare protection of the projection lenses from external light flare and improving of vision and depth of stereoeffect.
(22) FIG. 8 shows yet another embodiment of the unit 8 for forming of the stereopair frames. This unit contains the DPL matrix 22 with micromirrors 23 (for forming of color half-tone pixels according to well-known DLP digital technology of color processing and forming). The micromirrors 23 are located with consideration of their working deflections in vertical plane perpendicular to the matrix. From both sides in horizontal plane in front of the micromirrors three-color light emitting diodes are located: 24.sub.l (RGB)—for forming of the left frame and 24.sub.r—for forming of the right frame of the stereopair (by means of alternate switching on of red, blue and green colors, for example with frequency 30 Hz). Above the projection lenses 7.sub.r and 7.sub.l black absorbers 7a are installed (for absorption of the projection beams, deflected by the matrix micromirrors).
(23) All the three embodiments of the projection units on the FIGS. 6, 7 and 8 ensure forming of wide-frame frames of the projected stereopair in the common plane of their forming in the stereoprojector. This provides for wide-frame projection with improved stereoeffect and minimal dimensions of the stereoprojector.
(24) FIG. 9 shoes the projector 25.sub.l comprising the system of optical magnification of the projection 26.sub.l—left frame of the stereopair and projector 25.sub.r—right frame of the stereopair. Optical systems 26.sub.l and 26.sub.r emit projection from the point focus of point aperture of the microseptum or micromirror and direct it on the stereoscreen which focuses the projection into two micropoint focal zones of stereo vision (one focal zone of stereo vision is focused by the stereoscreen on the left pupil of the eye, another focal zone of stereo vision is focused by the stereoscreen on the right pupil of the eye) These optical systems 26.sub.l and 26r comprise LCD rear-projection display 26a for transmission of the projection beams from the stereoprojector onto the stereoscreen. In another embodiment the optical system consists of the transreflecting display 26b with mirror bottom layer under the LCD matrix in the form of mirror reflecting display the mirror pixel of which directs all the projection beams from the stereoprojector onto the stereoscreen. The rear-projection display comprises the video corrector unit 11a for forming and horizontal displacement in the limits of Δx and vertical displacement in the limits of Δy (by means of video signal) in the plane of the display of rear-projection transparent pixel—video aperture 27.sub.l (for projection of the left frame in the left eye) and 27.sub.r (for projection of the right frame in the right eye). In another embodiment the mirror display comprises the video corrector unit 11a for forming and deflection (by means of video signal) of the mirror pixel—micromirror in the plane of the display. In both embodiments surface of these pixels is formed considerably smaller than surface of the pupil of the eye. Alignment of focal zones of stereovision with the viewer's eye pupil ensures improved vision, and clearness of the visible screen stereoimage, for only central microzone of the eye crystalline lens works and eye accommodation is free from convergence and doesn't depend of the distance from the stereoscreen. Auto-correction of optical system displacement by means of the auto-corrector 10 and electronic and optical video correction of displacement of position of the microaperture or micromirror 27.sub.l and 27.sub.r by means of video corrector 11 is programmed in synchronism with coordinates and movements of the viewer's pupils of the eyes. Displays 26a and 26b are made with black antiglare coating.
(25) FIG. 10 shows a desk-top embodiment of the stereoscopic projection system (stereomonitor) with the reflecting spherical stereoscreen 1. The movable stereoprojector 6 is mounted on the stereoscreen 1 on the auto-drives 9. In front of the stereoscreen half way between the viewer and the stereoscreen the flat mirror 12 is positioned which is convenient and provides for compact construction for the desk-top embodiment. The projection lenses 7.sub.l and 7.sub.r of the stereoprojector are oriented on the flat mirror 12 to direct the projection onto this mirror and than reflection of this projection from the mirror 12 onto the stereoscreen 1. The auto-corrector 10 ensures auto-correction of displacement and rotation of the stereoprojector and its projection lenses, while the video corrector 11 ensures video correction of the stereoframes according to parameters of the viewer's eyes and optical characteristics of the stereoscopic system.
(26) FIG. 11 shows a portable notebook with reflecting spherical stereoscreen 1 and stereoprojector 6 placed in front of the stereoscreen on the viewer's breast for stereovision under moving conditions.
(27) FIGS. 12 and 13 show a head-mounted stereoprojector with a reflecting spherical stereoscreen in the form of the mirror glasses. The system is fixed on the head by means of an elastic rim or a strip 28. On the forehead in front of the stereoscreen two microprojectors are fixed: 25.sub.l—the projector forming left frame and 25.sub.r—the projector forming right frame. The projectors comprise the movable microprojection units 8 mounted on the auto-drives 9. The optical systems of projection magnification 26.sub.l and 26.sub.r are intended for forming of point focal zones of stereo viewing of left and right frames of the stereopair (focused by the stereoscreen 1 in the pupils of the corresponding eyes of the viewer). On the stereoscopic glasses the micro video cameras 4.sub.r and 4.sub.l are mounted with the tracking system 3 for monitoring of the pupils of the eyes, connected with the auto-correctors 10 and video corrector 11. The stereoscreen 1 is movable and mounted on the auto-drive 2, which allows performing of auto-correction.
(28) FIG. 14 shows the stereoscreen consisting of two movable parts with micromirror raster. The first part of the stereoscreen 1.sub.l comprises a raster of flat micromirrors inclined so that they provide point focusing of all the projection beams from the projector 25.sub.l in the pupil of the left eye. The second part of the stereoscreen 1.sub.r comprises a raster of flat micromirrors inclined so that they provide point focusing of all the projection beams from the projector 25.sub.r in the pupil of the right eye of the same viewer. The projector 25.sub.l (forming projection of the left frame of the stereopair) fastened on the first part of the stereoscreen 1.sub.l and fast focused onto the trapeziform mirror 27.sub.l (fastened on the right lateral face of the stereoscreen 1.sub.l and inclined relative to the plain of the stereoscreen for dispersing of the projection on the entire surface of the stereoscreen 1.sub.l). The projector 25.sub.r (forming projection of the right frame of the stereopair) fastened on the second part of the stereoscreen 1.sub.r and fast focused onto the trapeziform mirror 27.sub.r (fastened on the lateral face of the stereoscreen 1.sub.r and inclined for dispersing of the projection on the entire surface of the stereoscreen 1.sub.r). The stereoscreen part 1.sub.l is movable and mounted on the auto-drive 2 of the stereoscreen for auto-correction (by the auto-corrector 9) of the stereoscreen displacement jointly of the both parts of the stereoscreen 1.sub.l and 1.sub.r) along all the coordinate axes x, y and z and rotation of the stereoscreen around these axes at angles α.sub.x, β.sub.y and γ.sub.z The stereoscreen part of the 1.sub.r is horizontally movable relative to the stereoscreen part 1.sub.l and mounted on the auto-drive 2.sub.r for displacement by means of this auto-drive in the limits of Δx (in the plane of the stereoscreen) in synchronism with and parallel to the movements of the viewer's pupils of the eyes.
(29) FIG. 15 shows a movable stereoscopic projection system mounted on the auto-drive 2. The auto-drive provides for movable suspension of the system on the ceiling with a possibility to move this system along all the coordinate axes x, y and z and rotate it by means of the auto-drive 2 of the stereoscreen 1 at angles α.sub.x, β.sub.y and γ.sub.y around these coordinate axes. The system ensures synchronized optimal positioning of the stereoscreen relative to the face of the viewer, who can move in an ample space under the ceiling (in the zone of the movement of the stereoscopic projection system by the auto-drive 2 connected with the auto-corrector 9).
(30) The Stereoscopic Projection System Works as Follows:
(31) The video cameras 4.sub.l and 4.sub.r of the tracking system 3 by means of the light beams b.sub.l and b.sub.r (reflected from the viewers' faces) perform continuous monitoring of position data of the eyes and pupils of the eyes of all the viewers (profile of eyes and pupils, eyebrows, nose, face, mouth). The tracking system processes these data following the loaded program and determines exact coordinates of the eyes and pupils of the eyes, forms control signals c for the auto-correctors and send these signals to the auto-corrector 10. The auto-collimator 6 scans with the light beam d the reference points of mirror of the stereoscreen 1 and changes deviations (from the programmed coordinate point of auto-correction) of center point of the sphere M.sub.s of the stereoscreen 1 or of centers of curvature of the mirror sections of the assembled stereoscreen. The auto-collimator 5 forms control signals for deviation of the sphere centers of the stereoscreen sent to the auto-corrector 10. The auto-corrector 10 receives the signals c from the tracking system 3 and the signals e from the auto-collimator 5 and forms the control signals f for the video corrector 11 and the control signals g sent to all the auto-drives 9 (9a, 9b, 9c, 9d, 9e, 9f, 9g) of the stereoprojectors 6. These auto-drives mechanically continuously and dynamically (in synchronism with changes of position data of the viewers; eyes, ocular convergence and ocular focal point) correct all movements along the coordinate axes and rotations around these coordinate axes of the stereoprojectors as well as auto-focusing of projection lenses in these units. The video corrector 11 in response to the signal f from the auto-corrector forms the control signals h for programmed video corrections of the stereopair frame images (formed in the projection units 8 of the stereoprojectors). The electronic and optical video correction corrects: displacements of the frame centers by optimal stereobases for harmonizing of horizontal parallaxes with the stereobase, ocular convergence and ocular focal points, elimination of vertical parallaxes, correction of geometrical distortions and scales of the projected stereopair frames for compensation of mirror curvature of the stereoscreen and provision of convergence of the conjugate points coinciding with the viewer's ocular focal point. This provides full control stereoviewing at various angles of observing of the screen stereoimages with account of the ocular convergence angles and changes of ocular focal points. For enabling viewers with eyesight defects (in case of different linear ocular magnification and different dioptries for different eyes of the viewer) to observe stereoimages without dioptrical glasses an individual auto-correction program for the auto-corrector and video correction of auto-focusing of the projection lenses 7.sub.l and 7r can be chosen by the viewer. In case of closed eyes or glasses parameters of the eyes and for auto-correction are determined automatically by the tracking system performing monitoring of parameters of face profile, eyes, eyebrows, nose and mouth of each viewer with account of dioptries of the glasses and eyesight defects (input by the viewer for individual correction). For programming of such auto-correction the viewer preliminary takes off his glasses before the viewing for the tracking system to register eyes coordinates relative to continuously monitored face elements (eyebrows, nose or mouth or light points on the headphones).
(32) In yet another embodiment of the stereoprojector shown on the FIG. 9 (View D) the display 7.sub.l, 7.sub.r forms thin non-dispersing projection beams by pixels (video apertures or pixel micromirror—video reflector) 26.sub.l and 26.sub.r. Coordinates, displacement in the plane of display 25a and 25b and size of these pixels form video signal of the video corrector 11 in response to the signal from the tracking system 3 monitoring eye pupils coordinates. In case of quick movements of the viewer's head and eyes simultaneous auto-correction is ensured (by the auto-correctors 9c, 9d and 9e by the signals g) for coarse inertial displacement of the projectors 25.sub.l and 25.sub.r and electronic and optical video correction by the video corrector 11a for dynamic inertia free precise video displacements of these video apertures or video reflectors 27.sub.l and 27r for instantaneous and precise alignment of the point focal zones of stereopair vision with corresponding centers of eye pupils. For this purpose the reflecting spherical stereoscreen must be placed closer to the viewer's eyes at a distance of 20-1000 mm, have precise mirror sphere and be precisely positioned in the system for ensuring precise programmed alignment with calculated center point of the stereoscreen sphere. Viewing of projection precisely focused on the viewer's pupil of the eyes provides better stereoeffect than binocular viewing of real object (with light beam dispersing by the eye pupil width. Free ocular accommodation (focusing) is ensured and viewing of deeper stereoeffect and more stereo planes than for observing of real objects. This allows for the viewer light adjustment of ocular focusing for optimal convergence corresponding observing of real objects. Such optical system provides maximal and full comfort of stereoviewing without limitation of viewing duration. For short-sighted or long-sighted viewers the system ensures full visual comfort without dioptricalal glasses. Additional effect—maximal design simplicity of the stereoscopic projection system without projection lenses (causing problems of aberration and glare). Such stereoscopic projection systems can be very small in size (with stereoprojectors volume less than 0.01 dm.sup.3), with minimal weight of 15 g, with low-inertial precise auto-drives of the stereoprojectors and optical elements of the stereo projection system and with minimal power consumption. This increases portability of the stereoscopic projection system with maximum and full comfort of stereovision (owing to overlarge stereovision field, invisibility of the stereoscreen plane and comfort ocular accommodation for far planes behind the stereoscreen with clear viewing of stereoeffect behind the screen). Such stereoscopic projection system can be used in the form of stereoscopic glasses shown on the FIGS. 12 and 13 or head mounted devices shown on the FIGS. 14 and 15. The system ensures auto-correction or video correction of these in case of displacements of the stereoscreen and/or the viewer's pupils of the eyes as in the stereoscopic projection systems shown on the FIG. 1 (taking into account modifications of the programs and design elements of a stereoscopic projection system for one stereoprojector and one viewer). These embodiments can provide the largest field of vision with horizontal angles up to 140° and vertical angles up to 100° (or for the entire zone seen by the two eyes). Stereoviewing is possible both with and without dioptricalal glasses. Design and location of the stereoscreens are optimal for the moving viewers (during the work, going or in the transportation means); for this purpose the stereoscreen must be located above the horizon level in all the vision zone. Below the horizon level a transparent zone remains allowing observing of the surrounding objects and space.
