KR20150035104A - Method of adjusting three-dimensional effect and stereoscopic image display using the same - Google Patents

Abstract

The present invention relates to a method for adjusting a three-dimensional effect and a three-dimensional image display device using the same. The method comprises the steps of: separating left-eye image data and right-eye image data from input three-dimensional image data; determining positive depth and negative depth of the input three-dimensional image data; and adjusting the positive depth using a first parameter and adjusting the negative depth using a second parameter to change a disparity between the left-eye image data and the right-eye image data.

Description

TECHNICAL FIELD [0001] The present invention relates to a stereoscopic effect adjusting method and a stereoscopic image displaying method using the stereoscopic effect adjusting method,

The present invention relates to a stereoscopic effect adjustment method and a stereoscopic image display device using the stereoscopic effect adjustment method.

Stereoscopic image reproduction technology is applied to a display device such as a television or a monitor, so that 3D stereoscopic images can be viewed at home. The stereoscopic image display device can be divided into a spectacle method and a non-spectacle method. The spectacle method realizes a stereoscopic image by using polarizing glasses or shutter glasses by changing the polarization direction of the right and left parallax images to a direct view type display device or projector and displaying them in a time division manner. An optical component such as a parallax barrier or a lenticular lens for separating a stereoscopic image is installed in front of or behind the display screen to realize a stereoscopic image.

The stereoscopic image display device provides a user interface that allows the user to adjust the stereoscopic effect. The user can adjust the depth and focus of the stereoscopic image through the user interface. The stereoscopic image display device adjusts the stereoscopic effect by adding or multiplying the parameter value inputted from the user to the depth.

The stereoscopic effect that can be felt from the 3D image displayed on the stereoscopic image display device can be adjusted to disparity. Adjusting the disparity adjusts the depth. Depth writing is divided into a negative depth in which the virtual image of the object is formed in the front direction of the screen and a positive depth in which the image of the object behind the screen is formed as shown in FIGS. 1 and 2.

(Hereinafter referred to as " left eye pixel L ") and right eye image pixel data (hereinafter referred to as" right eye pixel R "Quot;). ≪ / RTI > The viewer feels stereoscopic due to binocular parallax when viewing the left eye pixel in the left eye and the right eye pixel in the right eye. 'D' is the distance between the screen and the user, and 'l' is the distance between the eyes of the user (6 to 7 cm). 'd' is the depth, or depth, between the screen and the convergence point. The convergence point is located at the focal distance of the viewer's left eye and right eye. The viewer recognizes the virtual position of the object as a position at the convergence point. The screen is zero parallax.

Negative Depth writes the image of the object between the viewer and the screen. (Hereinafter referred to as " L light path ") between the left eye and the left eye pixel of the viewer and a light path (hereinafter referred to as" R light path ") between the right eye and the right eye pixel of the viewer are intersected in front of the screen Negative Depth is implemented. Therefore, the positions of the left-eye pixel and the right-eye pixel in the negative depth are the same as the left-side circular object in FIG. In the geometrical analysis as shown in Fig. 1, the negative depression can be expressed as d = (S x D) / (I + S).

Positive Depth writes the image of the object behind the screen. The L-light path and the R-light path meet at a convergence pointer located behind the screen. Therefore, the positions of the left-eye pixel and the right-eye pixel in the positive depth are the same as those of the triangle object in FIG. In the geometrical analysis as in FIG. 1, the positive depression can be expressed as d = (S x D) / (I-S).

In FIG. 3, a rectangular object is a zero depth object having no disparity between a left-eye pixel and a right-eye pixel. The convergence point of the rectangle object is located on the screen.

Conventionally, the stereoscopic effect adjustment method changes the distance between the left eye pixel and the right eye pixel and the degree of intersection, that is, the disparity, thereby changing the stereoscopic effect felt by the user. However, the conventional method of adjusting the three-dimensional sensation can add or multiply the same parameter values irrespective of the depth type or the user's three-dimensional sensibility, thereby distorting the three-dimensional feeling. For example, conventional stereoscopic adjustment methods add or multiply the same parameter values to all depths of a 3D image including negative depth, zero depth, and positive depth. Since the zero deprecated disparity is zero, there is no stereoscopic effect because the convergence point is located on the screen. This method differentiates the three-dimensional feeling of the user with respect to the negative depth and the positive depth, and also gives a three-dimensional effect to the zero depth to distort the three-dimensional feeling.

The present invention provides a stereoscopic effect adjustment method for reducing a stereoscopic effect distortion by considering a stereoscopic effect or a characteristic of a viewer when adjusting a stereoscopic effect, and a stereoscopic image display device using the stereoscopic effect adjustment method.

According to another aspect of the present invention, there is provided a method of generating image data, the method comprising: separating left eye image data and right eye image data from stereoscopic image data; Determining a positive depth and a negative depth of input stereoscopic image data; And adjusting the positive depth using the first parameter and adjusting the negative depth using the second parameter to change the disparity of the left eye image data and the right eye image data.

The second parameter is different from the first parameter.

The stereoscopic image display apparatus of the present invention includes a display panel; A display panel driving circuit for writing left eye image data and right eye image data to the display panel; And adjusting the negative depth using the first parameter and the negative depth using the second parameter to determine the depth of the left eye image data and the right eye image data, And supplies the image data to the display panel driving circuit by changing the parity.

The present invention can reduce the 3D sensory distortion when the 3D depth is controlled by independently setting the parameters for adjusting the negative depth and the parameters for adjusting the positive depth.

1 to 3 are views showing a negative depth and a positive depth for realizing a three-dimensional feeling.
FIG. 4 is a diagram showing a three-dimensional sensation or depth of a viewer varying according to disparity in a negative depth.
FIG. 5 is a diagram showing a three-dimensional sensation or depth of a viewer varying according to disparity in a positive depth.
6 is a flowchart illustrating a control procedure of a three-dimensional sense adjusting method according to an embodiment of the present invention.
7 is a diagram illustrating examples of a stereoscopic image data format.
8 is a view showing parameters for adjusting the positive depth and the negative depth.
9 is a block diagram illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Before describing the embodiments, some terms used in the embodiments will be defined as follows.

Disparity is the distance between pixel data that implements binocular disparity, and is the distance between the left-eye pixel and the right-eye pixel for the same object displayed on the screen.

The present invention implements disparity with the amount of pixel data seen in the left eye and the amount of shift in pixel data seen in the right eye.

FIG. 4 is a perspective view or depth (y-axis) of a viewer varying in disparity (x-axis) in negative depth. 5 is a perspective view or depth (y-axis) of a viewer varying according to disparity (x-axis) in the positive depth.

Referring to FIGS. 4 and 5, the stereoscopic effect felt by the viewer can be changed by adjusting the disparity. However, the same disparity change in negative depth and positive depth is quite different. This has been introduced in "Depth perception in stereoscopic displays" (by Robert Patterson, Steve Becker, G. Scott Boucek, and Ray Phinney), published in the Journal of the SID, Feb. 2,

The negative depth write increases gradually as the disparity increases and converges to a certain depth value, but the positive depth write increases rapidly as the disparity increases. As a result, when the negative depth and the positive depth are changed by the same amount of the disparity, the amount of change of the positive depth becomes significantly larger than that of the negative depth. Therefore, when the same parameters are added or multiplied in the negative depth and the positive depth as in the conventional method of adjusting the three-dimensional feeling of the related art, the three-dimensional feeling is severely distorted when compared with the three-dimensional effect of the original 3D image. In addition, the conventional method of adjusting the three-dimensional sensation of the prior art adds or multiplies the parameters applied to the negative depth and positive depth to objects on the screen having Disparity = 0 (zero) without stereoscopic effect. In order to prevent the problem of the conventional art, the depth adjustment method of the present invention adjusts the depth by applying different parameters to the negative depth and the positive depth in consideration of the stereoscopic effect of the viewer as shown in FIGS. 4 and 5, Depth is not adjusted for objects on the screen with Disparity = 0 (zero).

6 is a flowchart illustrating a control procedure of a three-dimensional sense adjusting method according to an embodiment of the present invention. 7 is a diagram illustrating examples of a stereoscopic image data format.

6 and 7, the stereoscopic effect adjustment method of the present invention receives stereoscopic image data including a 3D image and separates left eye image data and right eye image data (S1 and S2). One frame of the stereoscopic image data includes left eye image data and right eye image data as shown in FIG.

In the data format as shown in FIG. 7A, one frame data is divided into two horizontally, left eye image data (LEFT) is allocated to the left half, and right eye image data (RIGHT) is allocated to the right half. In the data format shown in FIG. 7 (b), one frame data is divided into upper and lower halves to allocate left eye image data (LEFT) to the upper half and right eye image data (RIGHT) to the lower half. In the data format as shown in FIG. 7C, one frame data is divided into blocks of a check pattern type, and left eye image data (LEFT) and right eye image data (RIGHT) are allocated to neighboring blocks. The stereoscopic effect adjustment method of the present invention separates left eye image data (LEFT) and right eye image data (RIGHT) of 1/2 frame amounts from one frame data in step S2 and then interpolates left eye image data and right eye image data, can do.

Then, the stereoscopic effect adjustment method of the present invention generates a disparity map image by calculating the disparity of the left eye image data and the right eye image data. (S3) In the disparity map image, Is expressed. In the negative depth projected from the screen toward the viewer, the higher the disparity is, the higher the gradation (or white gradation) is represented. On the other hand, in a positive depth that moves away from the screen, the higher the disparity is, the lower the gradation (or black gradation) is represented.

The stereoscopic effect adjustment method of the present invention adjusts the stereoscopic effect according to display panel characteristics or when a viewer desires. When the stereoscopic effect adjustment is required, the stereoscopic effect adjustment method of the present invention analyzes the disparity map to determine the depth of the stereoscopic image data, selects a first parameter (FIG. 8, a) to be applied to the positive depth, Parameters (Fig. 8, b) are selected (S4, S5a, S5b). Next, the three-dimensional sense adjusting method of the present invention adjusts the positive depth by using the first parameter (a) and adjusts the negative depth by using the second parameter (b). At this time, the stereoscopic effect adjustment method of the present invention does not adjust the zero depth (S6)

Then, the stereoscopic effect adjustment method of the present invention modifies the disparity of the left eye image data and the right eye image data on the display panel based on the disparity map image with the depth adjusted (S7 and S8)

As shown in Fig. 8, the stereoscopic effect felt by the viewer is changed even more with the small disparity in the positive depth compared with the negative depth. Therefore, in the method for adjusting the three-dimensional sensation of the present invention, the second parameter b to be applied to the negative depth is set to a value larger than the first parameter a to be applied to the positive depth in consideration of the cubic perception characteristic of the viewer.

The first and second parameters a and b may be set to values that have been optimized in advance according to the display panel characteristics measured through the spectral experiments of the viewer. Therefore, the first and second parameters a and b may vary depending on the display panel characteristics. Further, the first and second parameters a and b can be varied by the viewer through the user interface.

The stereoscopic image display device of the present invention can be applied to a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode An organic light emitting display (OLED), an electrophoretic display (EPD), or the like. The stereoscopic image display apparatus of the present invention can be realized as a stereoscopic image display apparatus of a non-spectacles type or a stereoscopic image display apparatus of a glasses type, and displays 2D image data in a 2D mode and 3D image data in a 3D mode. A 3D optical element may be bonded onto the display panel of the stereoscopic image display apparatus. The stereoscopic image display apparatus of the glasses system can be realized by the polarizing glasses system or the shutter glasses system.

The 3D optical element is an optical element for separating subpixels viewed through the left eye of a viewer and subpixels viewed through the right eye in a spectacle-free manner, and may be an optical component such as a parallax barrier or a lenticular lens. Further, the 3D optical element may be a pattern retarder or an active retarder for converting the polarization characteristics of the left eye image and the right eye image differently in the eyeglass system. The parallax barrier and the lenticular lens can be realized by a switchable barrier or a switchable lens that is electrically controlled using a liquid crystal panel. Applicants have proposed a switchable barrier and a switchable lens through US Application No. 13/077565, US Application No. 13/325272, and the like. The glasses system requires 3D glasses such as polarized glasses or shutter glasses.

9 is a block diagram illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention. In Fig. 9, the 3D optical element and the 3D glasses are omitted.

Referring to FIG. 9, the stereoscopic image display apparatus of the present invention includes a display panel 100, a display panel driver, a stereoscopic effect adjusting device 110, and the like.

The display panel 100 includes a pixel array in which data lines and scan lines (or gate lines) are orthogonalized and pixels are arranged in a matrix form. The pixel array displays a 2D image in the 2D mode and a left eye image and a right eye image in the 3D mode.

The display panel driving unit includes a data driving circuit 102 for supplying data voltages of the 2D / 3D image to the data lines of the display panel 100, a scan pulse (or gate pulse) to the scan lines of the display panel 100 A scan driver circuit 104 for sequentially supplying the scan signals, and a timing controller 120 for controlling the drive circuits 102 and 104. The display panel driving unit writes the left eye and right eye image data whose disparity is varied by the three-dimensional adjustment device 110 to the pixels of the display panel 100 in a temporal or spatial manner.

The data driving circuit 102 converts the digital video data input from the timing controller 120 into an analog gamma voltage to generate data voltages and supplies the data voltages to the data lines of the display panel 100. In the case of a liquid crystal display element, the data driving circuit 102 can reverse the polarity of the data voltage supplied to the data lines under the control of the timing controller 120. [ The scan driving circuit 104 supplies a scan pulse synchronized with the data voltage supplied to the data lines to the scan lines under the control of the timing controller 120, and sequentially shifts the scan pulses.

The timing controller 120 supplies the digital video data of the 2D / 3D input image input from the host system 200 to the data driving circuit 102. In addition, the timing controller 120 receives a timing signal such as a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a main clock input from the host system 200 in synchronization with the digital video data of the 2D / 3D input image , And controls the operation timings of the display panel drivers 102 and 103 using the timing signals.

The timing controller 120 can raise the frame frequency of the input image to a frame frequency × N (N is a positive integer equal to or greater than 2) Hz and control the operation frequency of the display panel driving units 102 and 103 at a frame rate multiplied by N times have. The frame frequency of the input image is 60 Hz in the National Television Standards Committee (NTSC) system and 50 Hz in the PAL (Phase-Alternating Line) system.

The stereoscopic effect adjusting device 110 receives stereoscopic image data of the format shown in FIG. 7 from the host system 200. The stereoscopic effect adjusting device 110 adjusts the negative depth and the positive depth except the zero depth using the first and second parameters a and b according to the control procedure as shown in FIG. Change the parity. The left eye image data and the right eye image data reconstructed by the three-dimensional adjustment device 110 are transmitted to the data driving circuit 102 through the timing controller 120.

The host system 200 may be implemented as any one of a TV system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 200 uses the scaler to convert the digital video data of the 2D / 3D input video into user data input through a user interface (not shown) of the host system 110 matching the resolution of the display panel 100 And transmits the mode signal to the timing controller in response to switching the 2D mode operation and the 3D mode operation.

The viewer can adjust the stereoscopic effect through the user interface 210. The host system adjusts the first and second parameters a and b according to the amount of stereoscopic effect adjustment input through the user interface 210 and transmits the adjusted first and second parameters a and b to the image adjustment device 110. The user interface 210 may include a keypad, a keyboard, a mouse, an on screen display (OSD), a remote controller, a graphical user interface (GUI), a touch UI UI, 3D UI, and the like.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the present invention should not be limited to the details described in the detailed description, but should be defined by the claims.

100: display panel 110: image control device
102: data driving circuit 104: scan driving circuit
120: Timing controller 200: Host system

Claims (6)

Separating the left eye image data and the right eye image data from the stereoscopic image data;
Determining a positive depth and a negative depth of input stereoscopic image data; And
Adjusting the positive depth using the first parameter and adjusting the negative depth using the second parameter to change the disparity of the left eye image data and the right eye image data,
Wherein the second parameter is different from the first parameter. The method according to claim 1,
Wherein the second parameter is greater than the first parameter. The method according to claim 1,
Wherein zero-depth writing is not adjusted in the left-eye image data and the right-eye image data in which the positive depth and the negative depth are adjusted. Display panel;
A display panel driving circuit for writing left eye image data and right eye image data to the display panel; And
Eye image data and the negative depth of the input stereoscopic image data, adjusts the positive depth by using the first parameter, adjusts the negative depth by using the second parameter, And supplies the image signal to the display panel driving circuit,
Wherein the second parameter is different from the first parameter. 5. The method of claim 4,
Wherein the second parameter is larger than the first parameter. 5. The method of claim 4,
Wherein the zero depth writing is not adjusted in the left eye image data and the right eye image data in which the positive depth and the negative depth are adjusted.

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