JPS63245090A - Depth sense control method for stereoscopic television picture - Google Patents

Abstract

PURPOSE:To resolve the unnatural property and to freely control the sense of depth in accordance with viewer's desire by arbitrarity deflecting horizontal phases of right and left pictures in opposite directions at every field. CONSTITUTION:Horizontal phases of right and left pictures are deviated from each other by an arbitrary extent + or -DELTAx on the screen at every field, and this extent + or -DELTAx is freely controlled in accordance with viewer's desire, and horizontal phases of right and left pictures are deviated by equivalent extents in opposite directions at every field. When the horizontal phase of only either of the right or left picture is deviated, an object does is not protruded forward or recessed backward but protruded or recessed in oblique directions on a stereoscopic picture and the picture is unnatural. Thus, the sense of depth of the stereoscopic television picture is freely controlled to the state which the viewer desires.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling a two-lens stereoscopic television, and more particularly to a method for controlling the sense of depth of a stereoscopic television image based on the principle of a time-sharing stereoscopic television system. It is something.

(Prior Art) Until now, no method has been proposed for controlling the sense of depth in stereoscopic television images.

(Problems to be Solved by the Invention) Binocular parallax is one of the various factors for obtaining depth perception information. This means that the position of the object seen with the eye on the retina is on the left and right.
! This is due to the fact that i (L and R) are different. To explain this with reference to FIG. 5, this is due to the fact that the positions of the real images of the objects P and Q on the retina are different. The other is the angle α1 seen from both eyes with respect to objects P and Q in FIG. This is due to the difference in the size of α2, and this is called the convergence angle.

In the case of natural vision, binocular disparity is expressed in angle as θ2−θ, =
Δθ, and if expressed using pupillary distance a and viewing distance, Δθ=θ2−θ1=α, −α2, and binocular disparity is 1/D relative to viewing distance in real space with natural vision. On the other hand, in a stereoscopic image using the binocular parallax method, as shown in Fig. 6, if the amount of binocular parallax on the screen S surface is e, ΔDr / Dt = e/
(a + e), and from this ΔD1 e! =ja・□. Therefore, it is a two-lens stereoscopic image.

The binocular disparity at 1 changes by 1/D with respect to the viewing distance. This is where the difference in appearance from natural vision arises.

In addition, it is thought that there are generally individual differences in the desired depth sensation (stereoscopic effect) received from stereoscopic images, and an image quality adjustment mechanism that allows the viewer to freely control the depth sensation according to the viewer's preference at the viewing position is needed. Necessary and essential. However, such an image quality control method regarding the sense of depth has not yet been realized.

Therefore, the purpose of the method of the present invention is to solve the unnaturalness caused by the fact that the reproduction of the sense of depth due to changes in viewing distance differs from the reproduction in real space of natural vision in stereoscopic television images using binocular parallax. The object of the present invention is to provide a depth perception control method that allows the viewer to freely control the depth perception according to their preference.

(Means for Solving the Problems) In order to achieve this object, the depth perception control method for stereoscopic television images of the present invention provides a method for controlling the sense of depth of a stereoscopic television image when sequentially displaying a left image and a right image for stereoscopic television display in a time-sharing manner. , the horizontal phases of the left image and the right image are arbitrarily shifted in opposite directions for each field.

(Examples) The present invention will be described in detail below by way of examples with reference to the accompanying drawings.Prior to this, in order to facilitate understanding of the present invention, the principle on which the present invention is based will be briefly described.

Figure 2 shows two cases in which the reproduced position of the subject appears at point P, which is far from the display screen S, in a binocular stereoscopic television image (a), and (b) when it appears nearer than the screen S (point Q). An example is shown.Comparing the case where it appears at point P and the case where it appears at point Q, the horizontal viewing positions of the left eye and right eye R on the display screen S and the mouth are left and right reversed in both cases. In other words, whether the reproduction position of the subject is to be on the far side of point P or near point Q with respect to the display screen surface depends on the viewing position of the left eye or right eye R on the display screen S. determined by the relative horizontal position of the

Therefore, in a binocular stereoscopic television image, if the horizontal phase of the image is relatively shifted to correspond to the viewing position of the left eye and the right eye, then the point P is obtained.

Since the position of the display screen surface changes relative to the Q point, the sense of depth can be controlled. The method of the present invention was developed based on this idea.

FIGS. 1(a) and 1(b) show phase deviations of images in the time axis direction for explaining the main points of the control method of the present invention. Furthermore, Fig. 1(a) is shown in Fig. 2(a), and Fig. 1(b) is shown in Fig. 2(a).
The state of image deviation corresponding to b) is shown.

In both Figures 1(a) and (b), the horizontal phases of the left and right images are shifted by an arbitrary distance ±ΔX on the screen for each field, and ±ΔX is determined by the viewer's preference. You can freely control it according to your needs. As is clear from FIGS. 1 and 2, the horizontal phases of the left and right images are shifted by an equivalent amount in opposite directions for each field. Here, if the horizontal phase of only either the left image or the right image is shifted, the subject will protrude or retract in the diagonal direction rather than the front-back direction in the stereoscopic image, resulting in an unnatural image.

FIG. 3(a) shows a block diagram of the first embodiment of the device that achieves the purpose of the control method of the present invention, and FIG. 3(b) shows the input section to the monostable multi-vibration MMI of FIG. 3(a). FIG. 3C shows a signal waveform diagram for explaining how the horizontal phase is changed in the method of the present invention.

In the device shown in FIG. 3(a), the horizontal synchronizing signal and the pulse width T, , T from the signal (1) in FIG. 3(c).

Monostable multi-bibreak MMI pulses.

Generated by MM2. That is, signals (2) and (3) in FIG. 3(C) are mono-multi MMI and MM, respectively.
This is the output signal of No. 2. At this time, in normal image display, the sum of period T+ and period T2 is set to be the standard IH horizontal scanning time. In the second case, mono-multi MMI, MM
2. The output signal waveforms of MM3 are shown in (2) and (2) in Figure 3 (C).
As shown by the solid lines in 3) and (4), the output signal from the output end horizontal synchronizing signal output is in phase with the horizontal synchronizing signal of signal (1).

Now, if the pulse width of the mono-multi MMI is increased by the period ΔT (waveform of the broken line in Fig. 3(C)), the mono-multi MM3
The output of is the original horizontal synchronization signal, the period Δ is longer than that of signal (1)
Late by T. The output of this mono multi MM3, signal (4
) The horizontal phase can be changed by using the broken line signal as a trigger for the horizontal deflection circuit. Conversely, if you shorten the pulse width of mono-multi MMI, mono-multi M
The output of M3 will lead relative to the original horizontal sync signal. In this way, by controlling the pulse width of the mono-multi MMI for the left and right images, the horizontal position of each image can be varied differentially for each field.

The pulse width of this mono-multi MMI can be determined by adding resistors Rr, Rz and switches S+, S- to the time constant circuits R, C of the mono-multi, as shown in the equivalent circuit shown in Figure 3(b), and charging the capacitor C. This is done by switching the current.

The switches S1 and 32 are switched between the left image and the right image in synchronization with the vertical synchronizing pulse by the output signal of the flip-flop FF controlled by the vertical synchronizing pulse VP. Furthermore, Figure 3 (
The switch SW in a) is a three-dimensional effect change-over switch that allows the image to be projected forward or retracted to the back, and the variable resistor VR is used to control the extent.

FIG. 4 shows a second embodiment (a) that achieves the object of the control method of the present invention, and (b) the phase modulation voltage waveform of the horizontal synchronization signal.
C). Figures (b) and (c) show the reference voltage (■) when no modulation is performed. A modulation voltage of ±Δ■ is inverted and superimposed on each field.

This modulated voltage waveform can be easily obtained by counting down the vertical synchronizing signal of the stereoscopic television to 1/2 using a flip-flop circuit. Figure 4(a) shows this second
1 is a circuit diagram of a horizontal deflection portion of a display device equipped with a horizontal deflection drive circuit 1, a choke 2, a horizontal deflection yoke 3, a coupling transformer 4, etc. in order to explain an embodiment of the present invention. Centering current 1. This is realized by modulating the above-mentioned phase modulated voltage waveform via the coupling transformer 4.

Here, if the voltage amplitude Δ■ of the phase modulation signal mentioned above is varied using a variable resistor or an infrared control method, the sense of depth can be freely controlled according to the viewer's preference.

Furthermore, although the embodiments of the present invention have been mainly described so far in terms of a method of applying them to a time-division stereoscopic television system,
It goes without saying that the present invention can also be applied to a polarizing filter or a half-mirror combination system using two left- and stand-alone stereoscopic display devices.

Note that when implementing the present invention, if the horizontal phases of the left and right images are shifted significantly, a horizontal retrace period will appear on the screen, so the variable range of the horizontal phase is limited to the horizontal phase of a normal television display device. Overscan amount (8 to 1
4%) is desirable. Fortunately, in stereoscopic television images, the sense of depth can be greatly changed by changing the horizontal phase by only about ±5%.

Another method is to expand the horizontal overscan amount further than the normal 8-14% only when displaying a 3D television image, and return to the normal overscan state when displaying a 2D image. can also be considered.

(Effect of the invention) In the conventional two-lens 3D television system that uses binocular parallax, the sense of depth of the 3D image changes as the viewing distance changes, but as mentioned above, this is different from the case of natural viewing. The natural feel of the 3D image was sometimes impaired due to the change in the 3D image.

Further, if a stereoscopic image is intentionally created so that the subject appears to jump out from the screen, it may cause eye fatigue and create an unpleasant impression.

According to the method of the present invention, it is possible to freely control the sense of depth received from a stereoscopic television image into a state that is considered desirable by the viewer, and the above-mentioned problems can also be solved at the same time.

In addition, the circuit system that can realize the method of the present invention is extremely simple.
There is no problem economically. Furthermore, the method of the present invention can be easily applied to the time-division 3D video disc system (3D-VHD) with a field frequency switching method of 60 Hz, which is already commercially available, and the time-division 3D television system with a flicker-free field frequency switching method of 120 Hz. Applicable.

Furthermore, if the method for controlling the sense of depth according to the present invention is implemented using a device that uses infrared rays, etc., the sense of depth can be controlled to be optimal at the viewing distance of the viewer, and even more effects can be exhibited. .

The present invention is also particularly effective when the stereoscopic television screen is made larger so that the viewer does not notice the image frame of the display device as much.

[Brief explanation of drawings]

FIGS. 1(a) and (b) show how the horizontal phase of the left and right images are changed for each field related to the control method of the present invention, and FIGS. FIG. 3 is a block diagram (a) of a first embodiment device related to the method of the present invention and a partial schematic equivalent circuit diagram (b) of the device; A signal waveform diagram (C) is shown for explaining how the horizontal phase is changed, and FIG. 4 shows the phase modulation voltage waveform (
b) and (C), FIG. 5 shows the relationship between binocular disparity and convergence angle, and FIG.
A diagram for explaining a stereoscopic image using a conventional binocular parallax method is shown. P, Q-11 Each object L - Left eye R...Right eye
S.-Screen MMI, MM2. MM3
---Respectively monostable multi-bi break R, R,, RZ ---Resistor C---Capacitor sw,
s,, s, - Switch FF - Flip-flop B - Buffer circuit VR... Variable resistor 1...
・Horizontal deflection drive circuit 2゛゛Choke 3-・Horizontal deflection yoke 4 Par coupling transformer D-m-Visual distance a.--Pupillary distance α1. α
2-Binocular disparity on convergence angle e-・-8

Claims (1)

[Claims] 1. In sequentially displaying the left image and right image for stereoscopic television display in a time-sharing manner, the horizontal phases of the left image and the right image are arbitrarily shifted in opposite directions for each field. A method for controlling the sense of depth in 3D television images.