KR20090020892A - Apparatus and method for displaying three dimensional picture using display pixel varying - Google Patents

Apparatus and method for displaying three dimensional picture using display pixel varying Download PDF

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Publication number
KR20090020892A
KR20090020892A KR1020070085528A KR20070085528A KR20090020892A KR 20090020892 A KR20090020892 A KR 20090020892A KR 1020070085528 A KR1020070085528 A KR 1020070085528A KR 20070085528 A KR20070085528 A KR 20070085528A KR 20090020892 A KR20090020892 A KR 20090020892A
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image
observer
display
stereoscopic image
change
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KR1020070085528A
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Korean (ko)
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KR100908677B1 (en
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임희빈
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주식회사 나노박스
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Abstract

The present invention discloses a stereoscopic image display device for displaying a stereoscopic image using a display pixel change, and a display method thereof.

The stereoscopic image display device of the present invention detects a position change of an observer who observes a stereoscopic image and outputs an observer position signal corresponding to the position change, and the stereoscopic image displayed on the display unit according to the observer position signal. And an image control unit for generating and outputting a control signal for varying a display position of the display unit and an image reproduction unit for outputting an image reproduction signal for displaying the stereoscopic image to the display unit according to the control signal. By changing the display position of the left and right eye images of the stereoscopic image in units of R, G, and B subpixels, the observer can observe continuous and natural stereoscopic images without distortion even if the observer's position changes.

Description

Apparatus and method for displaying three dimensional picture using display pixel varying}

The present invention relates to a stereoscopic image display device and a method using binocular parallax, and more particularly, the observer can change the display position of the stereoscopic image displayed on the display unit according to the positional change of the observer. The present invention relates to a stereoscopic image display apparatus using a display pixel change and to a stereoscopic image display method for observing continuous and natural stereoscopic images without distortion.

In general, a binocular parallax type stereoscopic image display device uses a non-auto stereo scope method for wearing a special glasses-like device to observe a stereoscopic image, and an autostereoscopic method for observing a stereoscopic image with the naked eye. scope method).

Representative methods for implementing stereoscopic images using binocular disparity in autostereoscopic methods include a method using a lenticular lens sheet and a parallax barrier method.

In the method using the lenticular lens sheet, the lenticular lens sheet is attached to the front surface of the terminal display unit, and the image is incident to the left and right eyes by using the angular angle of the lenticular lens. However, this method causes a phenomenon in which the image quality is deteriorated because the 2D image cannot be displayed as it is due to the lens refraction characteristics of the lenticular lens sheet when observing a general 2D image constituting most contents. Therefore, such a method generates a distortion phenomenon that requires precision or does not accurately display image information such as numbers and letters.

The parallax barrier method uses a slit that forms an opaque band and a transparent band at regular intervals without using a curvature of the lens itself to observe a three-dimensional stereoscopic image. The image is separated into the left and right eyes by controlling the incident angle or the exit angle of the light.

Recently, an opaque band is formed where an electrical signal is input, and a transparent band is formed where an electric signal is not input. A liquid crystal panel is installed between the display unit and the observer. Forming and varying methods have been introduced and used.

1 is a diagram illustrating a stereoscopic image display method using a conventional parallax barrier method.

As shown in FIG. 1, in the conventional parallax barrier method, the right eye image and the left eye image are alternately repeatedly displayed in order from the left pixel RGB of the display unit. In addition, a liquid crystal panel (LCD filter) is formed between the display unit and the observer's eye by alternately repeating the transparent and opaque bands of the vertical line according to the electric signal. The stereoscopic image is displayed by allowing only the right eye image to be incident.

In this case, in FIG. 1, "left" and "right" represent a left eye image and a right eye image incident on an observer's left eye and right eye through display pixels, and each display pixel includes R (Red) and G (Green). ), B (Blue) consists of three subpixels.

The parallax barrier method using the liquid crystal panel has the advantage that the entire liquid crystal panel is transparent by completely blocking the electrical signal to the liquid crystal panel when the stereoscopic image is not observed, and thus the general 2D image can be observed without deterioration. have.

However, in the conventional stereoscopic image display apparatus of FIG. 1, since the position of the slit is fixed and the image information is incident to the left and right eyes by simply using binocular disparity, the stereoscopic image is limited to a specific angle and position. There is a disadvantage that can be observed.

For example, when the position of the observer changes from side to side, the natural stereoscopic image region cannot be maintained and only the left eye image or the right eye image is visible, or the left eye image and the right eye image are overlapped, and thus the image quality is distorted or the stereoscopic image is reversed.

An object of the present invention for solving the above problems is to change the display position of the left and right images according to the position of the observer to enable the observer to observe the stereoscopic image without distortion, regardless of the position change of the observer.

According to an aspect of the present invention, there is provided a stereoscopic image display device comprising: an observer position detecting unit detecting a position change of an observer observing the stereoscopic image and outputting an observer position signal corresponding to the position change; An image controller configured to generate and output a control signal for varying a display position of the stereoscopic image displayed on the display unit according to the observer position signal; And an image reproduction unit for outputting an image reproduction signal for displaying the stereoscopic image to the display unit according to the control signal.

The stereoscopic image display method of the present invention includes a first step of detecting a change in the position of an observer who observes the stereoscopic image; And a second step of varying a display position of the stereoscopic image on the display unit on which the stereoscopic image is displayed according to a change in the position of the observer.

Preferably, the stereoscopic image display device and the stereoscopic image display method of the present invention vary the display position of the stereoscopic image in units of R, G, and B subpixels of the display unit.

The stereoscopic image display device of the present invention changes the display position of the left eye image and the right eye image of the stereoscopic image in units of subpixels as the position of the observer is changed from side to side, so that the observer is continuous and natural stereoscopic without distortion even if the observer's position changes. Allows you to observe the image.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the present invention.

In order to display a stereoscopic image through a flat panel display screen, binocular, trinocular, and four-eye multi-dimensional stereoscopic image information may be alternately arranged on the display pixels. Among these methods, using binocular vision is the most economical. Can be. Therefore, in the following embodiment, for convenience of description, a case of a binocular with a stereoscopic image displayed as a left eye image and a right eye image will be described.

2 is a block diagram showing a configuration of a stereoscopic image display device according to the present invention.

The stereoscopic image display apparatus of the present invention includes a stereoscopic panel 10, a display unit 20, a camera 30, an observer position detector 40, an image controller 50, and an image reproducer 60.

As shown in the liquid crystal panel of FIG. 1, the stereoscopic panel 10 is an LCD filter in which slits in the form of vertical lattice are formed by alternately arranging transparent and opaque bands of vertical lines, and the stereoscopic image is manifested in the display unit 20. The left eye image is incident on the observer's left eye and the right eye image is incident on the observer's right eye. In this case, the three-dimensional panel 10 may have a form in which the transparent band and the opaque band are fixed or a form in which the transparent band and the opaque band are selectively formed according to an electrical signal. That is, in the present invention, the stereoscopic panels used in the conventional stereoscopic image display device can be used as they are.

The display unit 20 is a flat panel display device that displays a stereoscopic image in accordance with an image reproduction signal (image data) from the image reproducing unit 60. In this case, each pixel (hereinafter, referred to as a display pixel) of the display unit 20 includes three subpixels representing R, G, and B.

The camera 30 photographs the image of the observer and outputs the captured image data to the observer position detector 40. In the present embodiment, the camera 30 is used as a means for acquiring information on the current position of the observer, but this is only an embodiment of the present invention, and any means capable of detecting the current position of the observer may be used. .

The observer position detector 40 analyzes the image data (image) captured by the camera 30 to detect the position change of the observer, and generates an observer position signal for informing the position change and outputs it to the image controller 50. do. In order to precisely control the display position of the left eye image and the right eye image according to the change of the observer's position, it is important to detect the change in the position of the two eyes in which the stereoscopic image is incident in the observer's body part in real time. To this end, the observer position detection unit 40 reads the image data photographed by the camera 30 to recognize the position of the eyes of the observer and continuously tracks the change to determine the direction and distance of movement of the two eyes. Detect. As in the present embodiment, a technique for recognizing the position of a specific part desired in the captured image and tracking the change in the position may use any position recognition and tracking algorithm conventionally used.

The image controller 50 outputs a control signal for changing the display position of the left and right eye images on the display unit 20 to the image reproducing unit 60 according to the observer position signal from the observer position detector 40. That is, the image controller 50 checks in which direction the observer has moved by using the observer position signal from the observer position detector 40, and in order to display the stereoscopic image without distortion in the viewer at the corresponding position, The display position of the right eye image is calculated (or searched) in which direction and how much. To this end, the image controller 50 includes a table in which the position change amount of the observer and the display position change amount of the stereoscopic image (left eye image and right eye image) are matched to search and find a display position value corresponding to the observer position signal from the table. I can make it. The image controller 50 outputs a control signal corresponding to the calculated (or searched) result to the image reproducing unit 60. In this case, the display position of the left eye image and the right eye image is controlled to be changed in units of R, G, and B subpixels constituting the display pixel.

The image reproducing unit 60 outputs an image reproducing signal for displaying a stereoscopic image to the display unit 20 according to a control signal from the image controlling unit 50. At this time, the position where each of the left eye image and the right eye image are displayed is not fixed as in the prior art and is changed according to a control signal. That is, the present invention does not change the position of the slit by varying the positions of the transparent and opaque bands of the three-dimensional panel provided in front of the display unit 20, as shown in the related art. Display position of the left eye image and the right eye image. To this end, the image reproducing unit 60 controls the display position of the left and right eye images of the vertical line displayed on the display unit 20 according to the control signal of the image control unit 50 to subpixels of R, G, and B. Move left and right in units. The function of the image reproducing unit 60 will be described later in more detail. In the following description, in order to display a stereoscopic image, the image data is divided into a left eye image and a right eye image, and the display of the image data alternately on the vertical line of the display unit 20 is already used in the art. Description is omitted.

In FIG. 2, the image control unit 50 and the image reproducing unit 60 are divided and illustrated as separate components for convenience of explanation, and the functions of the image control unit 50 and the image reproducing unit 60 are described separately. It can also be configured to be integrated in one component.

3 is a flowchart for describing an operation of a stereoscopic image display device of the present invention having the configuration of FIG. 2.

When the 3D image display device is turned on, the image reproducing unit 60 divides the image data for displaying a 3D image into a left eye image and a right eye image, and then displays odd-numbered pixels and even columns of the display unit 20 as shown in FIG. 3. An image reproduction signal for outputting the right eye image and the left eye image alternately to the pixels is output to the display unit 20. At this time, in the present invention, it is assumed that the observer is at the center of the display unit 20 by default. The observer position detector 40 analyzes the image data captured by the camera 30 while the stereoscopic image is displayed through the display unit 20 to continuously monitor the position of the observer to detect whether the observer's position changes. The observer position signal corresponding to the result is output to the image controller 50 (step 210).

For example, the observer position detector 40 recognizes the positions of the two eyes of the observer in the image of the observer photographed by the camera 30 and continuously tracks the change in the position of the eyes to determine how much the position of the observer has changed from side to side. Generates an observer position signal indicating the output to the image controller 50.

When the position of the observer changes by more than a predetermined level based on the observer position signal from the observer position detector 40 (step 220), the image controller 50 displays the display position of the left eye image and the right eye image corresponding to the change amount. The amount of change is calculated (or retrieved) (step 230).

For example, when the observer's eye, which normally observes the stereoscopic image, moves from the L and R positions to the L1 and R1 positions as shown in FIG. 4A, the observer's left eye and right eye are mixed with the left eye image and the right eye image. Can not observe the stereoscopic image properly. That is, distortion of the stereoscopic image is generated. Therefore, in order to eliminate such distortion, the position of the slit formed in the stereoscopic panel 10 is changed in the related art, but in the present invention, the display positions of the left eye image and the right eye image displayed on the display unit 20 are appropriately shifted. To this end, the image controller 50 checks how much the observer's position is moved in which direction based on the observer position signal from the observer position detector 40 and then corresponds to the movement distance (the amount of change in the observer's position) of the observer. The amount of change in the display position of the left eye image and the right eye image is calculated. That is, the display position of the left eye image and the right eye image is calculated in which direction how many subpixels should be moved on the display unit 20. Then, the image controller 50 outputs a control signal informing the display position of the left eye image and the right eye image to the image reproducing unit 60 according to the calculation result.

In this case, the display position change amount of the left eye image and the right eye image is the size of the slit formed by the designer of the stereoscopic image display device 10, the distance between the display unit 20 and the stereoscopic panel 10, and the display unit 20. In consideration of the distance between the viewer and the observer (the optimal distance for the stereoscopic image can be determined in advance and informed to the observer), the pre-calculation for each position change of the observer can be pre-calculated and stored as a table. In this case, the image controller 50 does not calculate display positions of the left eye image and the right eye image according to the change of the observer's position, and searches and finds the display position corresponding to the change amount of the observer's position in the table.

The image reproducing unit 60 determines the subpixels R, G, and B on which the left eye image and the right eye image are to be displayed on the display unit 20 according to a control signal from the image controller 50, and then uses the corresponding subpixels. An image reproduction signal for displaying the left eye image and the right eye image is output (step 240).

In the present invention, a method of changing the display position of the left eye image and the right eye image in units of subpixels of R, G, and B will be described in more detail.

FIG. 4 is a view for explaining how the position of the observer is slightly changed (moved) to shift the display positions of the left eye image and the right eye image by 2 subpixels.

With the size of the slit formed in the three-dimensional panel 10 and the distance between the three-dimensional panel 10 and the display unit 20 fixed to a specified value, the left eye and the right eye of the observer are located at the L and R positions, respectively. In this case, as shown by the dotted lines in FIG. 4A, only the left eye image is incident on the left eye, and only the right eye image is incident on the right eye, respectively, so that normal stereoscopic image display is possible.

However, in this situation, when the observer's eye moves from the L and R positions to the L1 and R1 positions, in the conventional stereoscopic image display apparatus in which the slit is fixed, the left eye and the observer's left eye are shown in FIG. The left eye image and the right eye image of the stereoscopic image are overlapped and incident on the right eye. That is, a part of the left eye image and a part of the right eye image are incident on the left eye and the right eye of the observer, respectively, so that the observer cannot see the normal stereoscopic image.

In this case, in the conventional stereoscopic image display apparatus, the positions of the slits are appropriately shifted by varying the positions of the transparent and opaque bands formed on the stereoscopic panel. By varying the display position of the image and the right eye image, the effect is the same as changing the slits of the stereoscopic panel. In this case, the display position change (movement) of the left eye image and the right eye image may be performed in units of display pixels, but it is preferably made in units of R, G, and B subpixels constituting the display pixels for a more accurate position change.

Each display pixel of the display unit 20 is composed of three subpixels R, G, and B, and the color (image) of one display pixel is determined by the combination of the R, G, and B subpixels. In other words, in order to display a desired color on a specific display pixel, only three R, G, and B subpixels positioned in succession need to be ordered. That is, if the three subpixels R, G, and B are located in the order of RGB, GBR, or the order of BRG, only the signal (data value) applied to each subpixel is the same. The display pixels consisting of the three subpixels all have the same color.

FIG. 4B is a diagram illustrating a state in which the left eye image and the right eye image in FIG. 4A are moved in subpixel units based on the above-described logic.

4B is compared with FIG. 4A, the left eye image and the right eye image in FIG. 4B are shifted left by 2 subpixels compared to the left eye image and the right eye image in FIG. 4A, and correspond to the left eye image and the right eye image in FIG. 4B. It can be seen that the subpixels are located in the order of GBR rather than in the order of RGB as shown in FIG. 4A (see the circled circle in FIGS. 4A and 4B).

For example, the image reproducing unit 60 uses subpixels of R 2 , G 2 , and B 2 in FIG. 4A in displaying the first left eye image from the left side of the display unit 20, but uses G 1 and B 1 in FIG. 4B. By using the subpixels of R 2 , the left eye image is shifted by 2 sub pixels to the left. Of course, by applying the same principle to the other left eye image and the right eye image, it can be seen that the stereoscopic image has moved to the left by 2 subpixels as a whole. In other words, if the image of the display pixels R N , G N , and B N , which are the Nth from the left of the display unit 20, is to be moved left by 2 sub pixels, the image reproducing unit 60 may execute R N. The video reproduction signal applied to the G N , B N subpixels may be applied to subpixels having the same color among the G N -1 , B N -1 , and R N subpixels. That is, the signal applied to G N is applied to G N -1 , and B N The signal applied to is applied to B N- 1 (R N remains unchanged). If only one subpixel is to be moved to the left, the image reproducing unit 60 supplies the image reproducing signal applied to the R N , G N , and B N subpixels of B N -1 , R N , and G N. Apply to subpixels.

In FIG. 4, only the case where the stereoscopic image is shifted to the left is illustrated. However, when the display pixels R N , G N , and B N which are in the N th are to be moved to the right by 2 sub pixels, R N and G are similarly used. The video reproduction signal applied to the N and B N subpixels may be applied to the subpixels of B N , R N + 1 and G N +1 .

In the state of FIG. 4, when the position of the observer is further changed to move the display position of the stereoscopic image by one subpixel to the left, the position where the left and right images are displayed is changed as shown in FIG. 5.

FIG. 5A illustrates a case in which the left eye image is incident to the right eye and the right eye image is incident to the left eye when the position of the observer is changed in the past. FIG. 5B is a left eye image and a right eye to solve the problem of FIG. 5A. The image has been moved by 3 subpixels to the left.

That is, in the conventional stereoscopic image display device, the first left eye image is still displayed on the display unit 20 using subpixels R 2 , G 2 , and B 2 regardless of the change in the position of the observer. The image reproducing unit 60 of the image display device displays the first left eye image using the subpixels R 1 , G 1 , and B 1 .

FIG. 6 is a diagram sequentially illustrating how the left eye image and the right eye image change in units of subpixels according to a change in the position of an observer according to each condition.

FIG. 6A illustrates a position where a left eye image and a right eye image are initially displayed, and FIGS. 6B to 6F show the positions in which the display position of the stereoscopic image is sequentially moved to the right by one subpixel.

1 is a view showing a conventional parallax barrier type stereoscopic image implementation method.

2 is a block diagram showing the configuration of a three-dimensional image display device according to the present invention.

3 is a flow chart for explaining the operation of the stereoscopic image display device of the present invention having the configuration of FIG.

4 is a view showing that the position of the observer slightly changed to shift the display position of the left eye image and the right eye image by 2 subpixels.

5 is a view showing a state in which the position of the observer is changed so that the display position of the left eye image and the right eye image is changed.

FIG. 6 is a view sequentially showing how the left eye image and the right eye image change in units of subpixels according to a change in the position of an observer according to each condition. FIG.

* Explanation of symbols for the main parts of the drawings

10: stereoscopic panel 20: display unit

30: camera 40: observer position detector

50: video control unit 60: video playback unit

Claims (10)

A stereoscopic image display device for displaying a stereoscopic image on a display unit, An observer position detector for detecting a position change of an observer who observes the stereoscopic image and outputting an observer position signal corresponding to the position change; An image controller configured to generate and output a control signal for changing a display position of the stereoscopic image displayed on the display unit according to the observer position signal; And And a video reproduction unit for outputting an image reproduction signal for displaying the stereoscopic image to the display unit according to the control signal. The method of claim 1, wherein the position detection unit And recognizing the position of the eye in the image of the observer photographed by the camera and tracking the change in the position of the eye to detect the change in the position of the observer. The method of claim 2, wherein the position detection unit And changing a left and right position of the observer. The method of claim 1, wherein the image control unit And a display position of the left eye image and the right eye image of the stereoscopic image is controlled to be changed in units of R, G, and B subpixels of the display unit. The method of claim 4, wherein the image control unit And a table in which the left and right position change amounts of the observer and the display position change amount of the stereoscopic image are matched to search for a display position corresponding to the observer position signal in the table. In the method for displaying a stereoscopic image, Detecting a change in position of an observer who observes the stereoscopic image; And And changing a display position of the stereoscopic image on a display unit on which the stereoscopic image is displayed according to a change in the position of the observer. The method of claim 6, wherein the first step And changing the left and right position of the viewer. 8. The method of claim 7, wherein the first step is Recognizing the position of the eye in the image of the observer photographed by the camera and tracking the change in the position of the eye to detect the change in the left and right position of the observer 3D image display method using a change in the display pixel. The method of claim 6, wherein the second step And a display position of the left eye image and the right eye image of the stereoscopic image is changed in units of R, G, and B subpixels of the display unit. The method of claim 6, wherein the second step And a table in which the position change amount of the observer and the display position change amount of the stereoscopic image are matched, and then the display position value corresponding to the position change of the observer is searched in the table. Way.
KR1020070085528A 2007-08-24 2007-08-24 3D image display device and stereoscopic image display method using display pixel change KR100908677B1 (en)

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KR101305873B1 (en) * 2013-03-26 2013-09-09 공주대학교 산학협력단 Three-dimensional pixel structure

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