RU2192104C2 - Method for producing stereoscopic television pictures - Google Patents

Abstract

FIELD: television engineering; stereoscopic television. SUBSTANCE: method using raster ways of separating stereo-mate picture frames includes reception of video signals carrying information about stereo-mate frames, generation of parallax images from these signals in the form of alternating vertical strips, reproduction and separation of parallax picture; in the process frame video signals are converted into digital form and then digital information is split by means of video processor into vertical strips whose width when displayed on television-set screen equals that of linear raster slit, and four vertical strips in left-hand frame of picture are replaced by vertical strips of first stereo-mate frame bearing respective numbers; parallax picture is viewed through linear raster featuring controlled optical density of separating strips. EFFECT: enhanced compatibility of television facilities. 2 cl, 4 dwg

Description

 The invention relates to the field of television technology, namely to stereo television systems using a raster method for separating images of stereo pair frames.

 A known method of obtaining stereoscopic television images (Shmakov P.V. et al. Stereo. M: Energy, 1968. S. 41-44), including the formation on the screen of the television receiver parallaxogram signals that carry information about the left and right frames of the stereo pair, by projecting using the optical system the images of the left and right frames of the stereo pair on the television screen through the encoding lens optical raster, as well as decoding the images of the parallaxogram using the decoding lens optical p aster.

 The disadvantage of this method of obtaining stereoscopic television images is the complexity and high cost associated with the need to use a projection television receiver and two lens optical rasters.

 A known method of obtaining stereoscopic television images (Shmakov P.V. Fundamentals of color and surround television. M: Soviet radio, 1954. S. 190-194), including the reception of video signals that carry information about the left and right frames of a stereo pair, the formation of these video signals parallaxograms in the form of alternating vertical stripes belonging to frames of a stereo pair, reproducing the image of the parallaxogram on the screen of a television receiver and separating this image by placing it between the screen and the viewer at a constant p Normal distance from the line raster screen with vertical stripes are separated.

 The disadvantage of this method of obtaining stereoscopic television images is the need to use a projection television receiver that includes an optical system with linear coding and decoding rasters, as well as the difficulty of fulfilling the compatibility condition of stereo television receivers with standard monotelevision systems, associated with the need to remove rasters when watching monotelevision broadcasts and mono images when viewing stereo broadcasts.

 The objective of the invention is to develop a method for stereoscopic television images, providing the ability to create compatible means of television technology.

 The solution to this problem is provided by the fact that in a method for reproducing stereoscopic television images, including receiving video signals carrying information about the left and right frames of a stereo pair, generating parallogram from these signals in the form of alternating vertical bars belonging to frames of a stereo pair, reproducing parallax images on a television receiver screen and separation of this image by placing a linear raster with vertical separator at a constant distance from the screen lanes, the video signals of the left and right frames are converted to digital form, and then, using a video processor, the digital information about the left and right frames of the stereo pair is divided into vertical stripes, the width of which when played on a television receiver is equal to the width of the slit of a linear raster, and replaced in the image of the left frame even vertical stripes to the corresponding numbers even vertical stripes of the right frame of the stereo pair, and the observation of the parallaxogram is carried out through a linear raster trolled optical density of the separation of vertical stripes.

 The linear raster is performed in the form of a liquid crystal controlled panel, the optical density of the separating vertical stripes of which can be changed under the influence of an electric field.

 The technical result is the creation of compatible television receivers with cathode ray tubes, optical projection devices and plasma panels.

 Compared with the prototype of the proposed method has a distinctive feature in the totality of actions and conditions that provide these actions.

 In FIG. Figure 1 shows the splitting of the left and right frames of a stereo pair into vertical stripes.

 Figure 2 shows the formation of the parallaxogram on the TV screen.

 In FIG. 3 shows a diagram of a television receiver that implements the proposed method for obtaining stereoscopic television images.

 In FIG. 1 are indicated: L and P (figa) positive digital images of the left and right frames of the stereo pair and the result of the separation (Fig. 16) of the images of the left and right frames of the stereo pair, respectively, in the vertical stripes 1L, 2L, ..., 1L and 1P, 2P , .... ip with a width δ equal to the width of the slit of the linear raster.

 In FIG. 2 are indicated: 1-screen television receiver, 2-parallaxogram with the image of the left 1L and right (i + 1) P bands of the stereo pair.

 In FIG. 3 marked: 1-television receiver, 2-screen television receiver, 3-parallaxogram, 4-liquid crystal controlled panel, 5-voltage source, 6-vertical separating raster strip with controlled optical density, 7-switch.

 A method of obtaining stereoscopic television images is implemented as follows.

 Information about the left and right frames of the stereo pair is transmitted to the television receiver 1 in the form of video signals, for example, via two television channels or through one channel during the sequential transmission of frames of the stereo pair. The video signals of the left and right frames of the stereo pair are converted to digital form, and then using the video processor the digital information about the left A and right P frames of the stereo pair is divided into vertical bands 1L, 2L, ..., iL and 1P, 2P, ..., ip respectively , in width δ, equal to the width of the slit of the linear raster (see Fig. 3a). After that, with the help of a video processor, a parallaxogram is formed by replacing the even frame of the even vertical stripes in the digital image of the left frame with the even vertical stripes of the right frame of the stereo pair corresponding in numbers (Fig. 2). The obtained digital parallaxogram is reproduced on the screen of a television receiver (Fig. 3a). Observation of this parallaxogram is carried out through a linear raster 4 installed at a constant distance from the screen of the television receiver. Moreover, when viewing a stereoscopic transmission, the voltage from the voltage source 5 is supplied to the liquid crystal panel through the switch 7. Under the influence of an electric field, an image of opaque separating strips 6 of the maximum optical density image is formed on the liquid crystal panel. The width of these bands is equal to the width of the slits δ. Observation through such a raster parallaxogram (Fig.3B) allows the viewer to perceive a three-dimensional image.

 When viewing a monoscopic transmission using the switch 7, the voltage source 5 is disconnected from the liquid crystal panel and the image of the separation strips disappears. This simply ensures the compatibility of the stereo television receiver with standard television.

 The liquid crystal panel is also turned off when the viewer observes a monoscopic image while watching a stereoscopic transmission. At the same time, the parallaxogram formation system is turned off, and only images of the left and right frames of the stereo pair are displayed on the screen.

 The method for obtaining stereoscopic television images was checked using an IBM Itellistatlon ZPz personal computer, a ScanJet 5p scanner (HEWLETT PACKARD), and a linear raster made on an organic glass plate. The raster contained 320 vertical stripes. Using the scanner, color images of the left and right frames of a stereo pair obtained by photographic input were input. The image of each frame contains 640 by 480 pixels. After processing and forming a parallaxogram using a personal computer, it was displayed on the monitor screen.

 When considering parallaxograms through the aforementioned raster, a clear and effective three-dimensional image was observed.

The advantages of the proposed method are:
- lack of complex projection optical devices;
- the possibility of application in modern television receivers with cathode ray tubes, projectors and plasma panels;
- ease of implementation of direct and backward compatibility of television receivers.

 The method of obtaining stereoscopic television images can be widely used in broadcast and applied stereoscopic television systems, as well as in computer technology, which is determined by the possibility of its implementation on the basis of well-known technical means, namely a video processor and a liquid crystal controlled panel.

Claims (2)

 1. A method of obtaining stereoscopic television images, including receiving video signals carrying information about the left and right frames of a stereo pair, generating parallogram from these signals in the form of alternating vertical stripes belonging to frames of a stereo pair, reproducing a parallax image on a television receiver screen and separating this image by placing it on a constant distance from the screen of a linear raster with vertical separating stripes, characterized in that the video signals of the left and the right frames are converted to digital form, and then using the video processor the digital information about the left and right frames of the stereo pair is divided into vertical stripes, the width of which when playing on a television receiver is equal to the width of the slit of the linear raster, and the even vertical stripes in the image of the left frame are replaced by the corresponding the numbers are even vertical stripes of the right frame of a stereo pair, and the parallaxogram is observed through a linear raster with a controlled optical density of the separator guides vertical stripes.  2. The method according to claim 1, characterized in that the linear raster is performed in the form of a liquid crystal controlled panel, the optical density of the separating vertical stripes of which is changed under the influence of an electric field.

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