A device for viewing stereoscopic 3D images using an electronic device with a screen display includes: a head fastener; a holder to receive and removably accommodate the electronic device in an accommodation space; a lens focusing light from the screen display to the eyes of the user; and a distance part, providing a predetermined distance between the lens and the screen display. The lens part provides a first image from a first part of the screen display to a first eye of the user, and a second image from a second part of the screen display to a second eye of the user. The holder part is supported relative to the lens by the distance part, the distance part being arranged to be reversibly collapsible, from a fully expanded state, in which the lens part is arranged at said predetermined distance from the screen display, to a contracted state.

A spatial image projection apparatus including a receiver configured to receive an image signal; a display unit configured to display an image acquired by processing the image signal; a projection unit configured to project a spatial image to a prescribed space by reflecting light corresponding to the image displayed on the display unit. Further, the projection unit includes a plate having a first surface facing the display unit and a second surface opposite to the first surface; and a protrusion arranged on the first surface or the second surface of the plate. In addition, the protrusion includes first and second slopes tilted at about 45 degrees relative to the surface of the plate, and an angle between the first and second slopes is about 90 degrees.

The present disclosure relates to a projection device, and more particularly, to a projection device including: a projector module configured to provide an image to a screen; and a lens module between a user's eyes and the screen, wherein the project module includes: a display module configured to provide a certain image; and a backlight module configured to provide light to the display module such that the image provided by the display module is projected on the screen, wherein the display module is between the backlight module and the screen, the display module is configured to induce a convergence reaction on the user's eyes such that the image projected on the screen has a convergence distance, and the lens module is configured to induce a focus reaction on the user's eyes and change a focal length of the image reproduced by the display module within a certain range.

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.

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.

A stereoscopic image display apparatus including: an optical device having an n (n≧2) number of regions provided corresponding to the n number of parallax images, respectively, each region being capable of diffusing a coherent light beam; an irradiation unit to irradiate the optical device with a coherent light beam to scan the n number of the regions; a spatial light modulator that is illuminated with a coherent light beam incident on each of positions of the optical device and then diffused, to generate a modulated image corresponding to each of the n number of regions, in sync with the scanning of the n number of regions with the coherent light beam; and a projection optical system to project the n number of parallax images generated by the modulated image onto one plane to superimpose the parallax images on one another on the one plane at different angles.

A stereoscopic image display apparatus including: an optical device having an n (n≧2) number of regions provided corresponding to the n number of parallax images, respectively, each region being capable of diffusing a coherent light beam; an irradiation unit to irradiate the optical device with a coherent light beam to scan the n number of the regions; a spatial light modulator that is illuminated with a coherent light beam incident on each of positions of the optical device and then diffused, to generate a modulated image corresponding to each of the n number of regions, in sync with the scanning of the n number of regions with the coherent light beam; and a projection optical system to project the n number of parallax images generated by the modulated image onto one plane to superimpose the parallax images on one another on the one plane at different angles.

Techniques for aligning and stabilizing images generated by an integrated stereo camera pair with images generated by a detached camera are disclosed. A first image is generated using a first stereo camera; a second image is generated using a second stereo camera; and a third image is generated using the detached camera. A first rotation base matrix is computed between the third and first images, and a second rotation base matrix is computed between the third and second images. The third image is aligned to the first image using the first rotation base matrix, and the third image is aligned to the second image using the second rotation base matrix. A first overlaid image is generated by overlaying the third image onto the first image, and a second overlaid image is generated by overlaying the third image onto the second image. The two overlaid images are parallax corrected and displayed.

Techniques for aligning and stabilizing images generated by an integrated stereo camera pair with images generated by a detached camera are disclosed. A first image is generated using a first stereo camera; a second image is generated using a second stereo camera; and a third image is generated using the detached camera. A first rotation base matrix is computed between the third and first images, and a second rotation base matrix is computed between the third and second images. The third image is aligned to the first image using the first rotation base matrix, and the third image is aligned to the second image using the second rotation base matrix. A first overlaid image is generated by overlaying the third image onto the first image, and a second overlaid image is generated by overlaying the third image onto the second image. The two overlaid images are parallax corrected and displayed.

A cone for use in a Pepper's Ghost illusion includes a conical wall of semi-reflective material, and an attachment member for removably attaching the cone to the surface of a light emissive display, and a method of displaying a Pepper's Ghost illusion includes positioning a cone of semi-reflective material onto a light emissive display; and displaying on the light emissive display an image that has been distorted by an inverse of a distortion caused by a reflection of the cone.