Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
  • H04N13/30—Image reproducers
  • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
  • H04N13/334—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using spectral multiplexing

Definitions

• the present invention relates to a chain allowing the retransmission of relief images fulfilling the first 6 conditions.
• This chain is not incompatible with the 7 ° and 8 ° conditions, but these would require a deeper transformation of the equipment of tele cinema and video recorders if we want to keep the compatibility 2d - 3d. However, it allows recording 3 d broadcasts by viewers without modifying existing video recorders.
• a second camera for the left shot of the stereoscopic couple It is synchronized with the same signals used by the first camera. It only sends a signal corresponding to red to the transmitter to modulate the amplitude of the subcarrier.
• the two cameras can be paired according to figure (I).
• the sliding of the two central mirrors makes it possible to adjust the basic width of the stereo stereos.
• the pivoting of a side mirror allows the adjustment of the convergence. This system does not allow very small bases to be obtained.
• the 2nd camera can be of the trichrome type, of which we will only use the red signal or a monochrome camera in which case we will add a red filter with narrow band or passing only ⁇ > 600nm.
• An electronic viewfinder adding the green and blue signals from the 1st camera and the red signal from the 2nd camera allows you to check the setting of the convergence at the same time as the development of objectives.
• the convergence of the cameras will generally be centered on the main plane, which will make it possible, on reception, to benefit from the 2d luminance signal for the two stereoscopic views at the level of this plane.
• a matrixing allows the FM modulation of the subcarrier with the differential signals EB-EY, EV-EY; ER-EY (DB, DV, DR) for 2 d transmission and AM modulation of the subcarrier, with the ER3d signal.
• the maximum amplitude will be 76%, but only in transition zones between yellow of the main plan and red of the secondary planes, that is to say very exceptional cases in nature.
• the amplitude of the anti-bell shape of the two differential channels DB2d and DR2d could be reduced within the limit where the signals could always be equalized by the clo circuits bells of the color receivers, before limitation by clipping, and, where the transmitted energy will be sufficient for all the national network, (fig.4)
• an accentuation of the red signal ER3d or DR3d can be planned and calculated during the optimization (fig.5)
• 2- A circuit to be added to the SECAM receiver (fig.6) comprising: 2a) A power outlet and of signals necessary for its operation as well as the subcarrier received before clipping, after bell circuit or before for the case where the amplifier and the limiter are an integrated circuit, or in order to make the adjustment of the assembly more independent.
• AM detection of the subcarrier by diode bridge making it possible to obtain a definition twice that obtained by a single diode.
• the definition of a 67 cm screen is of the order of I, I binds for PIL tubes and 1.3 Me for tubes with shadow mask. These definitions are in harmony with the definition of the detected signal.
• the signal can be ER 3d or ER3d - EY2d + cte. 2e -
• An amplifier of the ER3d signal, looped by a damped comparator allows to obtain an ER3d signal of a constant ratio with the ER2d signal, ratio which can be adjusted manually.
• the adjustable damping takes into account the maximum distance at 2 homologous points in the right and left views.
• the integration time can be limited by oscillating circuit, or by the erasure signals or by the signals of the delayed channel switch of the chroma stage.
• the signals ER3d and ER2d can be differential signals ER3d - EY2d + Cte and ER2d - EY2d 2f -
• a delay line of 64 ⁇ s with its channel balancing amplifier direct / delayed.
• a flip-flop to escape parasites from the unused channel (see diagram fig.7) 2g - A contactor, permutator, returns according to the diagram of the receiver, the 3d signals to replace the 2d signals, either towards the matrixing, or towards the tube. If the matrixing normally provides ER, EV, EB chroma signals to the tube, it will simply exchange the ER signals.
• ER3d is supplied by the transmitter.
• a differential signal is reconstructed before exchange: ER3d - EY2d Amorti + Cte for exchange.
• the signal EY 2d taken from the video is amortized over time to enjoy the definition of luminance on the red canon.
• the damping is adjustable so that the difference EY2d - EY2d damping does not cause a fan tome image on the secondary planes which is greater than the limit admitted by the visual cortex without fatigue, ie 5 to 8%.
• ER2d-EY2d + EY2d can be matrix the signal ER2d-EY2d + EY2d to compare it to ER3d.
• the ER3d signal obtained (regulated) will be reinjected into the tube to replace the signal
• Correction filters degraded continuously or discreetly, can move in front of or behind the fixed filters, either by translation (fig8) or by rotation (fig. 9) allowing adjustment of the brightness and filtering of fixed filters at the discretion of the spectators.
• Various devices can be used for moving and locating the position of these filters.
• the correction filter for red (4) is gray, blue or green, or a mixture of these colors.
• the quality of the filters may be less pure than that suggested above, but to the detriment of the brightness of the image, and moreover, an imbalance of the brightness will cause. some eye strain.
• the skirt can also be removed if the spectator is located in an area free of stray light rays. 4.-
• the accompanying drawings describe the essential points of the invention.
• Fig.I Shooting mounting diagram. a) three-color camera b) camera for 2nd red view c) 2 mirrors sliding along arrow for adjusting the stereo base d) fixed mirror e) pivoting mirror for adjusting the convergence.
• Fig. 2 Shooting mounting variant. a) trichrome camera b) camera for 2nd red view sliding along arrow for setting the stereo base. c) semi-silver, pivoting glass for adjusting the convergence. d) red filter if camera b is of type N. and B. Fig. 3 - Simplified diagram of the emission
• the 3d differential matrix can be omitted.
• FIG. 4 G-raphic modulation of A.M. of the Blue DB2d differential channel by an ER3d overmodulation of 50%.
• a) anti-bell curve of DB2d of S.E.C.A.M standard b) overmodulation limit for the main plane
• Fig. 5 - ER3d channel pre-emphasis graph.
• f unaccented stress curve f;
• Fig. 10 Diagram of the television channel. a) three-color camera. b) 2nd camera for 2nd red view m) transmitter n) circuit adaptable to receiver p) optical decoder

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• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9263811

Family Applications (1)

Country Status (3)

Cited By (5)

Citations (1)

• 1981
  • 1981-11-09 FR FR8120915A patent/FR2516334A1/fr active Granted
• 1982
  • 1982-11-08 WO PCT/FR1982/000182 patent/WO1983001719A1/en unknown
  • 1982-11-08 EP EP82903247A patent/EP0093129A1/fr not_active Withdrawn

Patent Citations (1)

Non-Patent Citations (1)

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