JPH0435491A - Picture quality control circuit for stereoscopic picture - Google Patents

Abstract

PURPOSE:To display a natural stereoscopic picture by providing an interlocking means to adjust the magnification ratio of a zooming adjusting means according to horizontal phase difference a depth effect adjusting means sets. CONSTITUTION:The interlocking means 3 which adjusts the magnification ratio or the reduction ratio of the zooming adjusting means 2 according to the horizontal phase difference the depth effect adjusting means 1 sets is provided. Namely, the interlocking means 3 increases the magnification ratio and decreases the reduction ratio of the zooming adjusting means 2 or on the contrary, decreases the magnification ratio and increases the reduction ratio based on the size of an adjustment signal C or the horizontal phase difference, etc., set by the depth effect adjusting means 1. Then, a picture signal L for a left eye and a picture signal R of a right eye obtained from the zooming adjusting means 2 are supplied to a stereoscopic display means 4. Thus, since the size of the picture is controlled automatically according to the depth adjustment degree of the streroscopic picture, the same natural stereoscopic picture as in the case of actual solid recognition can be realized.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a 3D television system that can display 3D images without using glasses, and in particular relates to a 3D television system that is linked to adjustment of the depth perception of the entire screen. This invention relates to an image quality control circuit that changes the zoom rate.

(Prior Art) Binocular parallax is one of the pieces of information that humans use to perceive the depth of an object. This is the left eye and right eye R as shown in Figure 15.
When viewing two objects (41 x 42), far and near, the position of the image (43) reflected on the retina of the left eye and the position of the image (44) reflected on the retina of the right eye differ as shown in the figure, depending on the distance between the two eyes. , the positional shift on the retina is due to the difference between a distant object (41) and a nearby object (42).

Various stereoscopic televisions that utilize this binocular parallax have been proposed in the past; for example, one using a lenticular plate is disclosed in Japanese Patent Application Laid-Open No. 63-242093 [H04N13].
104), JP-A No. 63-248293 [HO4
N13104:].

By the way, there are generally individual differences in the preferred sense of depth received from 3D images, with some people preferring to set the reproduction position of 3D images farther away than the screen position and vice versa. Some people prefer to set up nearby.

Therefore, by horizontally shifting the display positions on the screen of images that should be viewed only with the left eye and images that should be viewed only with the right eye, 3D televisions can freely adjust the sense of depth. John method has been proposed (
JP-A-63-245090 [H04N13104]
).

Fig. 14 shows the principle of the 3D television system. The case where the position Q appears to be closer than S is shown. Comparing these cases, the horizontal viewing positions of the left and right eyes R on the screen S and the mouth are reversed. Further, as is clear from these figures, by changing the viewing positions of the two eyes and the distance between the mouths, the distance from the screen to the reproduction position P1Q of the subject can be freely changed. That is, depending on the relative horizontal positional relationship between the viewing positions of the left eye and the right eye R on the display screen S, the reproduced position of the subject with respect to the screen position changes in the perspective direction. Therefore, by changing the horizontal phase shift of the images for the left and right eyes, which corresponds to the viewing positions of the left and right eyes, it is possible to adjust the sense of depth of the stereoscopic image. .

(Problem to be solved) In the above stereoscopic television system, as shown in Fig. 14(a)
The size of the image itself changes when reproducing a 3D image in a position that is set back from the screen, as shown in (b), and when reproducing a 3D image in a position that protrudes in front of the screen, as shown in Figure (b). There isn't.

However, when viewing an actual object in real space, considering that when viewed from a distance the object appears small, and when viewed close up it appears large, the graph in Figure 14(a) It is unnatural that the size of the image does not change between case (b) and case (b).

An object of the present invention is to provide an image quality control circuit that can display a natural stereoscopic image by changing the size of the image depending on the degree of adjustment of the sense of depth.

(Means for Solving the Problems) As shown in FIG. 1, the image quality control circuit for stereoscopic video according to the present invention uses an image signal for the left eye. and a depth perception adjustment means (1) for changing the horizontal phase difference between the right eye image signal R0, and a left eye image signal and a right eye image signal obtained through the depth perception adjustment means (1). A zooming adjustment means (2) for enlarging or reducing the screen;
) is linked to the depth sensation adjusting means (1),
and interlocking means (3) for adjusting the enlargement or reduction ratio of the zooming adjustment means (2) according to the horizontal phase difference set by the depth feeling adjustment means (1), and the zooming adjustment means (2)
The left eye image signal R and the right eye image signal R output from
is supplied to the stereoscopic display means (4).

(Function) Signal C for adjusting the depth sensation of 3D images according to preference
When the image signal for the left eye is supplied to the depth sensation adjusting means (1), the image signal for the left eye is generated. A horizontal phase difference corresponding to the magnitude of the adjustment signal C is provided between the right eye image signal R0 and the right eye image signal R0.

The interlocking means (3) interlocks the zooming adjustment means (2) with the depth sensation adjustment means (1) based on the magnitude of the adjustment signal C or the horizontal phase difference set by the depth sensation adjustment means (1). , depending on the horizontal phase difference between the two image signals, the magnification rate of the zooming adjustment means (2) is increased or the reduction rate is decreased, or conversely, the magnification rate is decreased or the reduction rate is increased.

The left eye image signal R and the right eye image signal R obtained from the zooming adjustment means (2) are supplied to the stereoscopic display means (4), and as a result, based on the horizontal phase difference between the two image signals, the stereoscopic display means In (4), a stereoscopic image is projected.

(Effects of the Invention) According to the image quality control circuit for 3D images according to the present invention, the size of the image is automatically adjusted according to the degree of depth adjustment of the 3D images, so the same naturalness as in actual 3D recognition is achieved. It is possible to realize 3D images.

(Example) Hereinafter, an example in which the present invention is implemented in a lenticular plate type three-dimensional television will be described in detail. It should be noted that the examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

First, the basic configuration and operating principle of the image quality control circuit (5) of the present invention will be explained with reference to FIGS. 1 to 4.

As shown in FIG. 1, the image quality control circuit (5) includes a depth sensation adjustment means (1) that changes the horizontal phase difference between the left eye image signal L0 and the right eye image signal RO, and the depth sensation adjustment means (1). ) Zooming adjustment means (
2), and the operation of the zooming adjustment means (2) is linked to the depth feeling adjustment means (1), so that the depth feeling adjustment means (1)
) or zooming adjustment means (
2), and an interlocking means (3) for adjusting the magnification or reduction ratio of the zooming adjustment means (2). 4).

The depth sensation adjusting means (1) includes a left eye image signal. and right eye image signal R6 are input. A signal C for adjusting the depth sensation of a stereoscopic image according to preference is generated by operating an adjustment knob arranged on the operation panel of the television, for example, and is supplied to the depth sensation adjustment means (1).

As a result, the image signal for the left eye is changed. and right eye image signal R
0, a horizontal phase difference corresponding to the magnitude of the adjustment signal C is provided.

FIG. 4 schematically shows the operation of the depth sensation adjusting means. For example, the left eye image to be displayed on the screen. When adjusting so that a stereoscopic image is seen at a position protruding from the front of the screen with reference to the image R0 for the right eye, both image signals are adjusted according to the magnitude of the adjustment signal C by the operation of the depth feeling adjustment means. Horizontal phase difference beam.

Expand with Karari 2, D7, and Dll. On the other hand, when these image signals are directly supplied to the stereoscopic display means (4) and displayed on the screen, the image reproduction position changes as shown in the figure <Mz, M2, M, based on the binocular parallax, and the image becomes It looks like it flew.

The interlocking means (3) in FIG. 1 interlocks the zooming adjusting means (2) with the depth feeling adjusting means (1) based on the magnitude of the adjustment signal C, for example, so that the larger the horizontal phase difference between the two signals, the more the horizontal phase difference between the two signals increases. , the magnification rate of the zooming adjustment means (2) is increased, and conversely, as the horizontal phase difference becomes smaller, the magnification rate is decreased.

The left eye image signal R and the right eye image signal R obtained from the zooming adjustment means (2) are supplied to the stereoscopic display means (4), and as a result, based on the horizontal phase difference between the two image signals, the stereoscopic display means In (4), a stereoscopic image is projected.

FIG. 3 schematically represents the effect obtained by the interlocking circuit and the zooming adjustment means, and as described above, the reproduction position of the left and right image signals changes from M7 to M2 to M by the depth feeling adjustment means. Then, the left and right images are zoomed up accordingly, and when the image is reproduced in a position that jumps out to the front, it is possible to obtain a natural three-dimensional effect even though the image is large.

FIG. 2 schematically represents the on-screen operation of the image quality control circuit according to the present invention. A left eye image signal is input to the depth sensation adjusting means.

And the image based on the right eye image signal R0 is as shown in FIG. 2(a).
A predetermined phase difference in the horizontal direction. is set,
When the zoom ratio of the zooming adjustment means (2) is set to 1, the viewer can recognize a stereoscopic image at a predetermined depth position with respect to the screen surface. When the reproduction position of the stereoscopic image is set to the front by the adjustment signal C, the interlocking circuit operates to enlarge the image in conjunction with the zooming adjustment means or the depth feeling adjustment means. On the screen, the phase balance of both images is shown in the same figure (b). to D, and the central part (a 'b 'c 'd' of the screen area (abcd)
) or are enlarged and displayed according to the phase difference. As a result, the viewer can recognize the zoomed-in stereoscopic image at the reproduced position that jumps out to the front of the screen.

Next, the specific configuration of the three-dimensional television will be explained with reference to FIGS. 5 to 14.

As the stereoscopic display means (4), various well-known stereoscopic display devices that utilize binocular parallax can be employed. For example, FIG. 12 shows an example in which a three-dimensional display device is constructed from a liquid crystal panel (7) and a lenticular plate (35). LCD panel (
7) is a set of liquid crystal display elements R for the left eye and liquid crystal display elements R for the right eye, arranged at a constant pitch in an XY matrix, and the width area of one convex lens part of the lenticular plate (35). The pair of liquid crystal display elements LSR are housed in P. Both liquid height display elements R and R are driven by a left eye driver (33) and a right eye driver (34), respectively, in accordance with image signals. Lenticular plate (35)
Due to the lens action, only the light from the left-eye liquid crystal display element R enters the viewer's left eye, and only the light from the right-eye liquid crystal display element R enters the viewer's right eye. As a result, an image composed only of the left-eye liquid crystal display element R appears on the retina of the left eye, and an image composed only of the right-eye liquid crystal display element R appears on the right eye retina. Viewers perceive stereoscopic images based on binocular parallax.

Further, FIG. 13 shows an example of a plasma display type stereoscopic display device. The plasma display panel (45) has a back glass (36) and a front plate (46).
A large number of anode electrodes (
37) and cathode electrodes (38) are arranged in an XY matrix, and the front plate (46) is formed into a corrugated plate shape to provide a function as a lenticular plate. Anode electrode (
37) is used as a data electrode for the left eye and a data electrode for the right eye every other time.

Figure 5 shows the image quality control circuit (
5) to the liquid crystal panel (7). As is well known, the liquid crystal panel (7) includes a large number of horizontal scanning electrodes extending in the vertical direction and a large number of vertical scanning electrodes extending in the horizontal direction. The even-numbered data electrode is used as the data electrode for the right eye.

Both image signals R and R obtained from the image quality control circuit (5) are connected to the horizontal scanning electrode of the liquid crystal panel (7) via the left eye X driver (10) and right eye X driver (13), respectively. ing. X driver for left eye and right eye (1
0) (13) are the sample and hold circuits (8) (
12) and shift registers (9) and (11). In addition, the horizontal synchronization signal H and the vertical synchronization signal V obtained from a well-known synchronization separation circuit (not shown) pass through a synchronization control circuit (6) and become a horizontal drive pulse Hp and a vertical drive pulse Vp, respectively, to the left eye. shift registers (9) (11) of the X driver (10), and the Y driver (1
4) is supplied to the shift register.

In the above circuit, while scanning in the vertical direction by the Y driver (14), during each horizontal scanning period, the left eye X driver (10) drives odd-numbered horizontal scanning electrodes, and the right eye X driver (10) drives the odd horizontal scanning electrodes. Even-numbered horizontal scanning electrodes are driven by a driver (13). In this way, the left eye liquid crystal display device shown in FIG. 12 is operated by the odd-numbered horizontal scanning electrodes, and the first one is operated by the even-numbered horizontal scanning electrodes.
Only the right eye liquid crystal display element R shown in FIG. 2 will operate.

FIG. 6 shows a specific configuration of the image quality control circuit (5). Image signal for left eye. and the right eye image signal R8 are transmitted through a delay circuit (15) (18) and an A/D converter (22), respectively.
(23), frame memory (24) (25), vertical interpolation circuit (27) (28), horizontal interpolation circuit (29) (30)
) and D/A converters (31) and (32), the aforementioned left eye and right eye image signals are converted into R and output to the stereoscopic display means. The delay circuits (15) and (18) each include a CCD (16) and (19) as delay elements,
The VCO (17) and (20) generate a transfer lock, and the operation of both COs (17 and 20) is controlled by a delay control circuit (21), respectively.

The CCDs (16) and (19) are capable of delay processing by the product (NxT) of the number of internal charge holding stages N and the transfer lock period T. The VCOs (17) and (20) oscillate according to the input voltage and arbitrarily change the frequency of the CCD transfer lock.

Also, the A/D converter (22) (23), frame memory (24) (25), vertical interpolation circuit (27) (28)
, horizontal interpolation circuits (29) (30) and D/A converter (3
1) and (32) are each controlled in operation by a control circuit (26). The control circuit (26) receives a control voltage V output from the delay control circuit (21). and the aforementioned horizontal and vertical synchronization signals H1V are supplied.

In the image quality control circuit (5), the delay circuit (15)
(18) and the delay control circuit (21) constitute the aforementioned depth sensation adjusting means (1), and the A/D converter (22)
(23) to the D/A converters (31) and (32) and the control circuit (26) constitute the aforementioned zooming adjustment means (2), and furthermore, the circuit from the delay control circuit (21) to the control circuit (26) The above-mentioned interlocking means (3) is constituted by the signal line to and the control circuit (26).

By operating the adjustment knob (not shown) provided on the operation panel of the television, the delay control circuit (21)
The input DC voltage Vi changes, and the delay control circuit (2
1) is an output control voltage V that decreases as the input DC voltage Vi increases, as shown in FIG. , and, conversely, the output control voltage increases. 2 are simultaneously generated, and the V CO (17) of the left eye delay circuit (15) and the right eye delay circuit (18) are generated simultaneously.
) is output to V CO (20).

Figure 8 shows the right eye delay circuit (21) using the delay control circuit (21).
18). For example, CCD (19)
When the number of charge retention stages N is set to 20, the input image signal R, stored in the CCD ((a) in the same figure) is at the rising edge and rising edge of the vCO output ((b)), which is the transfer lock. At the downstream stage, it is transferred to the subsequent circuit, and at this time, it is delayed by 10 times the period T of the CO output, and the CCD
(19) ((C) in the same figure). From this state, the output control voltage V of the delay control circuit (21). 2, the period of the vCO output diagram (e)) increases to T2, and the input image signal R8 (the same diagram (d)) increases to 1 of the period T2.
The signal is delayed by a time of 0 and is output from the CCD (19) ((f) in the same figure). In this way, the delay control circuit (
As the input DC voltage of 21) increases, the horizontal phase of the right-eye image signal shifts more toward the delay side.

On the other hand, in the operation of the left eye delay circuit (15), since the input/output relationship of the delay control circuit (21) is opposite to that described above, when the input DC voltage is increased, the CCD
The delay time (16) becomes shorter, and the amount of horizontal phase shift of the left eye image signal becomes smaller.

Therefore, according to the depth sensation adjusting means, the horizontal phase of the image signal R1 outputted from the left eye delay circuit (15) and the horizontal phase of the image signal R1 output from the right eye delay circuit (18) are can be symmetrically shifted in opposite directions to each other in response to changes in the input DC voltage of the delay control circuit (21).

When the input DC voltage Vi of the delay control circuit (21) increases or decreases, the control voltage Vc for the control circuit (26) shown in FIG.
also increases and decreases as shown in Figure 9. The control voltage Vc is the control circuit (
26), the two image signals 1,
Zooming processing is performed on R2 in accordance with the horizontal phase shift of both image signals.

Various well-known circuits can be used as the zooming circuit, but in the embodiment shown in FIG.
), vertical interpolation circuits (27) (28) and horizontal interpolation circuits (
29) It consists of (30). That is, among the digital image signals for one frame stored in the frame memories (24) and (25), the central area of the screen (a'b'c'd ') is extracted, the signal is expanded according to the magnitude of the control voltage Vc, and deviations from the pixel position caused by this expansion are corrected by vertical interpolation and horizontal interpolation.

Figures 10 and 11 <a) and (b) represent the principle of the above interpolation. The original image in Figure 2 (a) is shown in Figure 2 (b).
For example, when enlarging an image by a factor of 15, the relationship between the scanning lines of the original image and the enlarged image is as shown in FIGS. 10(a) and 10(b). Therefore, in order to convert the enlarged image into a predetermined video signal, it is necessary to interpolate scanning lines 1 to 10 shown by broken lines based on scanning lines A to H shown by solid lines in FIG.

In this case, first, the vertical interpolation circuit shown in FIG.
) performs vertical interpolation. In order to interpolate the scanning line shown by the broken line from the scanning line of the original image shown by the solid line in the figure, linear linear interpolation is used based on the distance between the interpolated scanning line and the original scanning line above and below it. For example, when obtaining data 1' for an interpolated scanning line, the data 1111 for the original scanning lines above and below are multiplied by a weight corresponding to the distance from the original scanning line to the interpolated scanning line, and then added. At this time, the original scanning line data is stored in the frame memory.

Next, the horizontal interpolation circuit performs horizontal interpolation as shown in FIG. 11(b). In this case, the interpolation position is determined from the number of horizontal samples of the original image and the enlargement magnification, and the interpolation method uses the same linear interpolation as the vertical interpolation. For example, the data of 1" in the figure is added to the left and right data of 1° and 2°, each multiplied by a weight according to the distance from the 1" position.

The image data for the left eye and the right eye interpolated as described above are outputted as an image signal R through the D/A converters (31) and (32) shown in FIG. 6, respectively.

As a result, on the screen of the stereoscopic display device, the left eye image R and the right eye image R are displayed in horizontal positions to achieve a sense of depth according to the viewer's preference, as shown in FIG. 2(b). Images are projected with a phase difference and at a zoom rate corresponding to the horizontal phase difference, and a natural three-dimensional image is reproduced.

In the adjustment range of the zooming control means, the standard zoom ratio is set so that, for example, the size of the image displayed on the screen at standard time is about 80% of the original image size. This prevents the blanking period of the video signal from being displayed on the screen even when the three-dimensional video reproduction position is moved back and the image is reduced.

The above description of the embodiments is for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Further, the configuration of each part of the present invention is not limited to the above embodiments, and various modifications can be made within the technical scope of the claims.

For example, as the stereoscopic display means (4), various well-known binocular parallax type stereoscopic display devices can be employed, limited to those using lenticular plates. In addition, depth feeling adjustment means (1
) is not limited to arranging pixels for the left eye and pixels for the right eye on one convex lens part of the lenticular plate, but it is also possible to use a common pixel to create an image for the left eye and an image for the right end in each field. It is also possible to adopt a method of switching alternately.

Furthermore, the size of the image when the zoom ratio is set to the standard value can be adjusted arbitrarily. For example, when the zooming control means is set to the minimum enlargement ratio or the maximum reduction ratio, The size of the image for one frame to be formed is the entire screen area of the display device (
abcd).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of the image quality control circuit for stereoscopic images according to the present invention, FIG. 2 is a diagram explaining the operation of the image quality control circuit on the screen, and FIG. FIG. 4 is a diagram for explaining the interlocking operation of the zooming adjustment means, FIG. 4 is a diagram for explaining the operation of the depth feeling adjustment means, FIG. 5 is a block diagram showing the configuration of the stereoscopic display means, and FIG. 6 is a diagram for explaining the configuration of the image quality control circuit. 7 is a graph showing changes in the output control voltage of the delay control circuit to the delay circuit, FIG. 8 is a timing chart showing the operation of the delay circuit, and FIG. 9 is a graph showing the change in the output control voltage of the delay control circuit to the control circuit. Graph showing changes in control voltage, 10th
The figure is a diagram explaining the shift of scanning lines due to image enlargement, No. 11.
The figure is a diagram explaining the principle of vertical and horizontal interpolation, Figure 12 is a diagram showing a schematic configuration of a stereoscopic display means using a lenticular plate, and Figure 13 is an exploded view showing the main parts of a plasma display type stereoscopic display means. A perspective view, FIG. 14, is a diagram explaining the principle of depth perception adjustment, and FIG. 15 is a diagram illustrating the principle of stereoscopic recognition using binocular parallax. (1) Depth sense adjustment means (2) Zooming adjustment means (3) Interlocking circuit (4) Stereoscopic display means (5) Image quality control circuit (7)・LCD panel $11 figure

Claims (1)

[Scope of Claims] [1] A device for projecting a stereoscopic image by horizontally shifting the display positions of a left-eye image and a right-eye image on a screen and utilizing binocular parallax, comprising: Consisting of a depth perception adjustment means (1) for changing the horizontal phase difference between the image signal and the right eye image signal, and a left eye image signal and a right eye image signal obtained through the depth perception adjustment means (1). A zooming adjustment means (2) for enlarging or reducing the screen to be displayed, and a horizontal position set by the depth feeling adjustment means (1) by interlocking the operation of the zooming adjustment means (2) with the depth feeling adjustment means (1). interlocking means (3) for adjusting the magnification or reduction ratio of the zooming adjustment means (2) according to the phase difference, and the left eye image signal and the right eye image signal output from the zooming adjustment means (2). Three-dimensional display means (4)
An image quality control circuit for stereoscopic images, characterized in that it supplies images to a stereoscopic image.