Abstract: The invention relates to a stereoscopic reproduction system without glasses, comprising an image reproduction device using transparency acting as means for illuminating multiple viewers with polarized light, two image capture elements separated from one another, containing polarizing filters that allow each of them to capture two images, one with the reflection of the light in the corneas and the other one eliminating said reflection, processing means for obtaining the pixel-by-pixel subtraction of those two images, the location of each eye in each image being obtained as the geometric center of the reflections in each cornea and the parallax of each eye between the two capture elements.

Abstract: The present invention relates to a system for reproducing stereoscopic images comprising a projection screen, a projector, a first optical device, comprising a matrix of converging lenses having a focal distance f1, located in front of the projection screen, at a distance equal to twice the focal distance, a second optical device located in the focal plane of the first optical device and comprising a matrix of converging lenses, having a focal distance f2 equal to half the focal distance f1, located between the first optical device and the projection screen, and a third optical device located between the second optical device and the projection screen, in contact with the second optical device, the third optical device comprising a matrix of discriminating elements.

Abstract: The invention relates to a stereoscopic reproduction system without glasses, comprising an image reproduction device using transparency acting as means for illuminating multiple viewers with polarized light, two image capture elements separated from one another, containing polarizing filters that allow each of them to capture two images, one with the reflection of the light in the corneas and the other one eliminating said reflection, processing means for obtaining the pixel-by-pixel subtraction of those two images, the location of each eye in each image being obtained as the geometric center of the reflections in each cornea and the parallax of each eye between the two capture elements.

Abstract: The present invention relates to a system for reproducing stereoscopic images comprising a projection screen, a projector, a first optical device, comprising a matrix of converging lenses having a focal distance f1, located in front of the projection screen, at a distance equal to twice the focal distance, a second optical device located in the focal plane of the first optical device and comprising a matrix of converging lenses, having a focal distance f2 equal to half the focal distance f1, located between the first optical device and the projection screen, and a third optical device located between the second optical device and the projection screen, in contact with the second optical device, the third optical device comprising a matrix of discriminating elements.

Abstract: The method renders unobservable cross images with low light intensity that appear in the combined reproduction of various different images. It consists of adding a percentage in negative of each of these cross images to the positive of the correct image prior to reproduction, so that as a result of this addition it is possible to obtain, instead of the cross image, a uniform, contrastless image, i.e. where all the points have the same light intensity, which is generally so small as to be unobservable.

Abstract: The method renders unobservable cross images with low light intensity that appear in the combined reproduction of various different images. It consists of adding a percentage in negative of each of these cross images to the positive of the correct image prior to reproduction, so that as a result of this addition it is possible to obtain, instead of the cross image, a uniform, contrastless image, i.e. where all the points have the same light intensity, which is generally so small as to be unobservable.

Abstract: The present invention describes a system that is able to reproduce images in three dimensions, that is, stereoscopic, three-dimensional or integral, without the need for glasses or any other device in front of observer's eyes. The number of images necessary is small because the system is able to direct the images to the eyes of each observer. In the case of stereoscopic reproductions, this number is only two and in the case of three-dimensional or integral reproductions it is ten or several tens. Its fundamental characteristics are: it has a great focus field depth of the images which allows these to be directed to the observers' eyes wherever the latter are situated, it uses a single discriminating element of these images for each observer, it is able to reproduce bi-dimensional images both by transparency and by diffusion and it does not use movable elements.

Abstract: The optical system comprises a convergent mirror (Ec) and a plane mirror (Ep), which are duly positioned in order for the focus (F) established in the optical axis (X—X) of the convergent mirror (Ec) in turn to be located in the sector lying between both mirrors. An object (I1-I2) located in an area (1) is first reflected onto the plane mirror (Ep) and then onto the convergent mirror (Ec), yielding an image (I″1-I″2) in an area (2) opposite the area (1) in a normal position for an observer located at a point (O) outside the system, i.e. in such a position that the signs are legible.

Abstract: Process for the reproduction of three-dimensional static or moving images, in which the stills, in number greater than three, are positioned on a single film, projection is carried out in groups of stills which are projected through a single optical projection system, the optical path taken by the rays from the central still of each of these groups is not split by any lateral reflection, the remainder of the light rays from the remainder of the stills undergoes as many lateral reflections as indicated by the number of its position with respect to the central still, the stills on the film with an odd number of reflections being specularly inverted with respect to the stills which occupy even sites and the central one.