KR20130020296A

KR20130020296A - Method for evaluating color crosstalk on stereoscopic image display

Info

Publication number: KR20130020296A
Application number: KR1020110082842A
Authority: KR
Inventors: 박선희; 이돈규; 임경호
Original assignee: 엘지디스플레이 주식회사
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2013-02-27

Abstract

PURPOSE: A color crosstalk evaluation method of a 3D image display device is provided to calculate an influence degree of an interference monocular image for a color of an evaluation object monocular image by a predetermined 3D color crosstalk algorithm, thereby evaluating 3D color crosstalk of the 3D image display device. CONSTITUTION: A 3D image display device(60) displays a test signal inputted from a computer(70). An optical instrument(50) measures a color difference value of a UV color coordinate system by analysis of a photoelectric transformation signal. The computer evaluates 3D color crosstalk of an evaluation object monocular image by influence of an interference monocular image.

Description

Color crosstalk evaluation method of stereoscopic image display device {METHOD FOR EVALUATING COLOR CROSSTALK ON STEREOSCOPIC IMAGE DISPLAY}

The present invention relates to a stereoscopic image display device, and more particularly, to a 3D color crosstalk evaluation method.

The image quality evaluation items of the stereoscopic image display apparatus include contrast, flicker, 3D crosstalk, and the like. In this case, the 3D crosstalk is a pixel in which the left eye image data is written and the information is distorted due to the pixel in which the right eye image data is written, or vice versa. The information is distorted. Recently, in order to improve crosstalk of a stereoscopic image display apparatus, methods for quantitatively evaluating 3D crosstalk have been developed.

In general, 3D crosstalk is measured to the extent that the luminance of the monocular image to be evaluated is affected by the luminance of other monocular images. Here, the monocular image is a left eye image or a right eye image. The monocular image to be evaluated is a monocular image which is a 3D crosstalk measurement target, and the other monocular image which affects the monocular image to be evaluated is a monocular image which obstructs the luminance expression of the monocular image of the measurement target.

In the conventional 3D crosstalk evaluation method, 3D crosstalk was measured based on luminance as described above. Therefore, the existing 3D crosstalk method evaluates that there is no 3D crosstalk when the monocular image to be evaluated and the monocular image affecting the monocular image have the same luminance.

In most input images, the luminance of the monocular image to be evaluated and other monocular images affecting the monocular image are the same, but the colors are often different. In this case, the existing 3D crosstalk method determines that there is no 3D crosstalk of the monocular image to be evaluated, but in reality, 3D crosstalk which causes color distortion is seen.

The present invention provides a 3D color crosstalk evaluation method of a stereoscopic image display device capable of quantitatively evaluating 3D color crosstalk.

3D color crosstalk evaluation method of the present invention comprises the steps of: displaying on the stereoscopic image display the color of the monocular image to be evaluated and the color of the disturbed monocular image; Measuring a color coordinate value of the subject monocular image by changing a color of the disturbed monocular image by using a photometer disposed in front of the display surface of the stereoscopic image display device; And analyzing the pre-distortion color difference value of the evaluation target monocular image and the post-distortion color difference value of the evaluation target monocular image distorted due to the disturbing monocular image, thereby causing a 3D color cross of the evaluation target monocular image due to the influence of the disturbing monocular image. Evaluating torque.

The present invention can quantitatively evaluate 3D color crosstalk of a stereoscopic image display device by calculating the degree of influence of the disturbed monocular image on the color of the monocular image to be evaluated using a preset 3D color crosstalk algorithm.

1 is a block diagram illustrating a three-dimensional image display device of the polarizing glasses method according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example in which polarization of a left eye image and a right eye image are separated by a pattern retarder and polarizing glasses in a 3D image display device using polarized glasses.
3 is a block diagram illustrating a three-dimensional image display device of the shutter glasses method according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an example in which a left eye image and a right eye zero are time-divided by shutter glasses in a three-dimensional display device of a shutter glasses type.
5 is a diagram illustrating a color crosstalk evaluation system of a stereoscopic image display device.
FIG. 6A is a diagram illustrating a 3D color crosstalk test result of RGB three primary colors experimented with a 3D image display device using polarized glasses. FIG.
FIG. 6B is a diagram illustrating a 3D color crosstalk test result of RGB three primary colors experimented with a shutter glasses type stereoscopic image display device.
FIG. 7A is a diagram illustrating a 3D color crosstalk test result of CMY three primary colors experimented with a polarized glasses type stereoscopic image display device.
FIG. 7B is a diagram illustrating a 3D color crosstalk test result of CMY three primary colors experimented with a 3D image display apparatus using a shutter glasses type.
FIG. 8A is a diagram illustrating a 3D color crosstalk test result of Macbeth color experimented with a polarized glasses type stereoscopic image display device.
FIG. 8B is a diagram illustrating a 3D color crosstalk test result of Macbeth color experimented with a 3D image display device using a shutter glasses method.
FIG. 9A is a diagram illustrating a 3D color crosstalk test result of gray color experimented with a 3D image display device using polarized glasses. FIG.
FIG. 9B is a diagram illustrating a 3D color crosstalk test result of gray color experimented with a shutter glasses type stereoscopic image display device. FIG.

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, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The 3D color crosstalk evaluation method of the present invention can quantitatively evaluate 3D color crosstalk in all stereoscopic image display apparatuses that display stereoscopic images by separating a left eye image and a right eye image by spatial division or time division.

In the following embodiments, the 3D color crosstalk evaluation method of the present invention will be described using an eyeglass type stereoscopic image display device as an example, but can be applied to a stereoscopic image display apparatus without glasses without significant change. Therefore, it should be noted that the 3D color crosstalk evaluation method of the present invention is not limited to the stereoscopic image display apparatus of the glasses type. The stereoscopic image display apparatus of the glasses type is divided into polarized glasses type as shown in FIGS. 1 and 2 and shutter glasses type as shown in FIGS. 3 and 4.

1 and 2, the stereoscopic image display device of the polarizing glasses method includes a display panel 100, a pattern retarder 120 bonded on the display panel 100, a polarizing glasses 200, and a display panel driving circuit. 14, the display panel control unit 12, and the like.

The display panel 100 may include an electroluminescent device (EL) such as a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting diode (OLED), The display panel may be implemented as an electrophoretic display device (EPD). The display panel 100 includes data lines to which a data voltage (or data current) is supplied, gate lines (or scan lines) to which data gates intersect, and gate pulses (or scan pulses) are sequentially supplied, and a matrix. It includes a pixel array 102 disposed in the form. Each of the pixels of the pixel array 102 may include a TFT formed at each intersection of the data lines and the gate lines to supply a data voltage from the data line to the pixel electrode of the pixel in response to a gate pulse from the gate line. have. The polarizer 101 may be disposed between the display panel 100 and the pattern retarder 120.

The display panel 100 may spatially divide the left eye image data and the right eye image data. For example, as shown in FIG. 2, the left eye image data L may be displayed on odd-numbered line pixels of the display panel 100, and the right eye image data R may be displayed on even-numbered line pixels of the display panel 100. have.

When the display panel 100 is implemented as a liquid crystal display (LCD), the polarizing glasses type stereoscopic image display device further includes a backlight unit 110 and a backlight driving circuit 16. The backlight unit 110 is disposed behind the display panel 100 to face the rear surface of the display panel 100. The backlight unit 110 may be implemented as a direct type backlight unit or an edge type backlight unit. The light source of the backlight unit 110 may include any one or two or more light sources of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED). have. The backlight driving circuit 16 generates driving power for turning on the light source of the backlight unit 110 under the control of the display panel controller 12.

The display panel driver circuit 14 includes a data driver circuit and a gate driver circuit. The data driving circuit converts the digital video data of the 2D / 3D image input from the display panel controller 12 into a gamma compensation voltage and supplies the converted data to the data lines of the display panel 100. The gate driving circuit sequentially supplies gate pulses synchronized with the data voltages supplied to the data lines to the gate lines of the display panel 100 under the control of the display panel controller 12. The display panel driver circuit 14 writes 2D image data input from the display panel controller 12 to the pixel array 102 of the display panel 100 in the 2D mode, while the display panel controller as shown in FIG. 2 in the 3D mode. The left eye image data input from (12) is written into the odd line pixels of the pixel array 102 and the right eye image data is written into the even line pixels of the pixel array 102.

The pattern retarder 120 is attached to the display panel 100 to separate polarization characteristics of the left eye image and the right eye image. The pattern retarder 120 is a glass pattern retarder (GPR) having a pattern retarder formed on a glass substrate, and a film pattern retarder (FPR) having a pattern retarder formed on a film substrate. Divided. Recently, a film pattern retarder, which can reduce the thickness, weight, price, and the like of a display panel, is preferred to a glass pattern retarder. The pattern retarder 120 may include a first retarder facing the odd lines of the pixel array 102 and a second retarder facing the even lines of the pixel array 102. The optical axes of the first and second retarders are perpendicular to each other. Light of the left eye image L displayed on the odd lines of the pixel array 102 passes through the first retarder of the pattern retarder 120 as light of the first polarization. Light of the right eye image R displayed on the even lines of the pixel array 102 passes through the second retarder of the pattern retarder 120 as the light of the second polarization. Here, the first and second polarized light may be linearly or circularly polarized light of different optical axes. For example, as shown in FIG. 2, the first polarized light may be left circularly polarized light and the second polarized light may be right circularly polarized light.

The polarizing glasses 200 include a left eye filter for passing only the first polarization and a right eye filter for passing only the second polarization. Since the polarization of the left eye image and the right eye image are separated by the pattern retarder 120 and the polarizing glasses 200, the user sees pixels in which the left eye image is written through the left eye filter of the polarizing glasses 200, and the polarizing glasses 200. The right eye filter of) shows the pixels in which the right eye image is written, so that stereoscopic images can be viewed with binocular disparity.

The display panel controller 12 supplies digital video data RGB of 2D / 3D video input from the host system 10 to the data driving circuit of the display panel driving circuit 14. The display panel controller 12 receives and displays timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a main clock CLK input from the host system 10. Control signals C _DIS for controlling the operation timing of the data driving circuit and the gate driving circuit of the panel driving circuit 14 are generated. The display panel controller 12 may generate a boost / dimming control signal C _BL for controlling timing of turning on and turning off the backlight unit 110 and adjusting backlight brightness.

The host system 10 is connected to an external video source device such as a navigation system, a set top box, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, a broadcast receiver, a phone system, and the like. Video data can be received from an external video source device. The host system 10 includes a system on chip (SoC) including a scaler to convert image data from an external video source device into a format suitable for displaying on the display panel 100. The host system 10 generates a mode signal MODE in response to user data input through the user input device 18 to display panel controller 12, display panel driver circuit 14, and backlight driver circuit 16. Can be controlled by the 2D mode operation and the 3D mode operation. The user input device 18 may include a keypad for navigation, a keyboard, a mouse, an on screen display (OSD), a remote controller, a touch screen, and the like.

3 and 4 are views showing a three-dimensional image display device of the shutter glasses method according to an embodiment of the present invention.

3 and 4, the stereoscopic image display apparatus of the shutter glasses method according to the present invention includes a display panel 100, a shutter glasses 300, a display panel driving circuit 34, a display panel controller 32, and the like. do.

As described above, the display panel 100 includes an electroluminescent device EL such as a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting diode (OLED), and an electric It may be implemented as a display panel such as an electrophoretic display device (EPD).

When the display panel 100 is implemented as a liquid crystal display (LCD), the shutter glasses type stereoscopic image display device further includes a backlight unit 110 and a backlight driving circuit 36. The backlight unit 110 is disposed behind the display panel 100 to face the rear surface of the display panel 100. The backlight unit 110 may be implemented as a direct type backlight unit or an edge type backlight unit. The backlight driving circuit 36 generates driving power for turning on the light source of the backlight unit 110 under the control of the display panel controller 32.

The display panel driver circuit 34 includes a data driver circuit and a gate driver circuit (or scan driver circuit). The data driving circuit converts 2D / 3D digital video data input from the display panel controller 32 into a gamma compensation voltage and supplies the converted data to the data lines of the display panel 100. The gate driving circuit sequentially supplies gate pulses synchronized with the data voltages supplied to the data lines to the gate lines of the display panel 100 under the control of the display panel controller 32. The display panel driver circuit 34 writes the 2D image data input from the display panel controller 32 in the 2D mode to the pixel array 102 of the display panel 100, while the display panel controller as shown in FIG. 4 in the 3D mode. The N + 1th frame period ((N + 1) th after writing the left eye image data input from (32) to the pixels of the pixel array 102 during the Nth (N is a natural number) frame period Nth FR. FR.) Writes the right eye image data to the pixels of the pixel array 102.

The display panel controller 32 supplies digital video data RGB of 2D / 3D video input from the host system 30 to the data driving circuit of the display panel driving circuit 34. The display panel controller 32 receives and displays timing signals such as a vertical sync signal Vsync, a horizontal sync signal Hsync, a data enable signal DE, and a main clock CLK input from the host system 30. Control signals C _DIS for controlling the operation timing of the data driving circuit and the gate driving circuit of the panel driving circuit 34 are generated. In addition, the display panel controller 32 generates a boost / dimming control signal C _BL for controlling timing of turning on / off the backlight unit 110 and adjusting backlight brightness.

The host system 30 may receive input image data from an external video source device. The host system 30 includes a system-on-chip with a built-in scaler to convert image data from an external video source device into a data format having a resolution suitable for displaying on the display panel 100. The host system 30 transmits the image data of the content selected by the viewer to the display panel controller 32 in response to the viewer data input through the viewer input device 38. In addition, the host system 30 may generate a mode signal MODE in response to a viewer command input through the user input device 38 to set or change the current operation mode.

The host system 30 may output a shutter control signal through the shutter control signal transmitter 40 to open and close the left eye shutter and the right eye shutter of the shutter glasses 300. The shutter control signal transmitter 40 transmits a shutter control signal to the shutter control signal receiver through a wired / wireless interface. The shutter control signal receiver 42 may be built in the shutter glasses 300 or manufactured as a separate module and attached to the shutter glasses 300.

The shutter glasses 300 include a left eye shutter and a right eye shutter that transmit and block light by using a birefringent medium that can be electrically controlled individually to adjust light transmittance. The birefringent medium may be liquid crystal. Each of the left and right eye shutters is disposed between the first transparent substrate, the first transparent electrode formed on the first transparent substrate, the second transparent substrate, and the second transparent electrode formed on the second transparent substrate, and the first and second transparent substrates. It may include a sandwiched liquid crystal layer. The reference voltage is supplied to the first transparent electrode and the ON / OFF voltage is supplied to the second transparent electrode. Each of the left and right eye shutters transmits incident light toward the viewer's eye when the ON voltage is applied to the second transparent electrode, while blocking light transmitted toward the viewer's eye when the OFF voltage is applied to the second transparent electrode. . The host system 30 opens the left eye shutter of the shutter glasses 300 during the Nth frame period Nth FR. In which the left eye image data is displayed on the pixel array 102 as shown in FIG. 4, and the right eye of the pixel array 102. During the N + 1th frame period (N + 1) th FR. In which image data is displayed, the right eye shutter of the eyeglasses 300 is opened.

The main terms used in the following description will be defined as follows.

The evaluation target monocular image refers to a monocular image to be evaluated for 3D color crosstalk. The evaluation target pixel refers to a pixel in which the evaluation target monocular image is written.

The disturbed monocular image means another monocular image which affects the color of the monocular image to be evaluated. The disturbing pixel refers to a pixel in which another monocular image affecting the color of the monocular image to be evaluated is written. The disturbing pixel may be a pixel neighboring the pixel to be evaluated (FIG. 2). In addition, the disturbing pixel may be a pixel time-divided with the pixel to be evaluated (FIG. 4), and in this case, may be a pixel spatially identical to the pixel to be evaluated.

If the evaluation target monocular image is a left eye image, the obstructive monocular image is a right eye image causing color distortion of the left eye image. On the contrary, if the evaluation target monocular image is a right eye image, the obstructive monocular image is a left eye image causing color distortion of the right eye image.

5 is a diagram illustrating a color crosstalk evaluation system of a stereoscopic image display device.

Referring to FIG. 5, a color crosstalk evaluation system of a stereoscopic image display apparatus includes a stereoscopic image display apparatus 60, a photometer 50, a computer 70, and the like.

The stereoscopic image display device 60 displays a test signal input from the computer 70. The test signal may include RGB (Red, Green, Blue) data, CMY (Cyan, Magenta, Yellow) data, Macbeth color data, gray color data, and the like. The test signal displayed on the stereoscopic image display device 60 is displayed in the form of a box facing the photometer 50 or the entire display surface.

The stereoscopic image display device of the polarizing glasses type separates and displays a test signal of an evaluation target monocular image and a test signal of a disturbing monocular image in units of lines. The three-dimensional image display apparatus of the shutter glasses type time-divisionally displays a test signal of an evaluation target monocular image and a test signal of an obstructive monocular image.

The photometer 50 is disposed to be separated from the display surface of the stereoscopic image display device 60 by a predetermined distance to photoelectrically convert the light received from the stereoscopic image display device 60. The photometer 50 analyzes the photoelectric conversion signal, measures the color difference values u 'and v' of the uv color coordinate system, and transmits them to the computer 70. In the glasses-type stereoscopic image display device, the polarizing glasses 200 or the shutter glasses 300 are disposed in front of the light receiving surface of the photometer 50 similarly to the actual use environment.

The computer 70 supplies a test signal including the evaluation monocular image data and the disturbing monocular image data to the stereoscopic image display device 60. The computer 70 changes the color of the disturbed monocular image data by fixing the gray level of the evaluation monocular image data and changing the gray level of the disturbed monocular image data while keeping the color of the evaluation monocular image data constant. The computer 70 adjusts the gradation of the evaluation monocular image data and then repeats the above process. The computer 70 measures the color coordinate values u 'and v' of the evaluation monocular image input from the photometer 50 while changing the color of the obstructive monocular image in the above manner.

The computer 70 determines the difference between the ideal color coordinate value (pre-distortion color difference value) of the evaluation monocular image not distorted by the disturbing monocular image and the color coordinate value (post-distortion color difference value) of the evaluation monocular image distorted by the disturbing monocular image. The chrominance is analyzed to quantitatively evaluate the 3D color crosstalk of the opposing monocular image. To this end, the computer 70 receives the color coordinate values u ', v' of the evaluation target monocular image and the disturbed monocular image from the photometer 50 and calculates the color difference values Δu'v 'below. Substituting into equation 1, 3D color crosstalk (3D Color C / T [Δu'v ']) of the monocular image to be evaluated is calculated.

Here, u ' _ij v' _ij is a color coordinate value when the test signal gray level of the evaluation target monocular image is i and the test signal gray level of the disturbed monocular image is j. u ' _ii v' _ii is a color coordinate value when the test signal gradation of the monocular image to be evaluated is equal to the test signal gradation of the disturbing monocular image. The 3D color crosstalk (3D Color C / T [Δu'v ']) of the monocular image to be evaluated is represented by u' _ij in Equation 1. = u ' _ii and v' _ij = V 'it is zero when one _ii.

6A to 9B are experimental results of calculating 3D color crosstalk using an algorithm of Equation 1 using the system shown in FIG. 5.

FIG. 6A is a diagram illustrating a 3D color crosstalk test result of RGB three primary colors experimented with a 3D image display device using polarized glasses. FIG. FIG. 6B is a diagram illustrating a 3D color crosstalk test result of RGB three primary colors experimented with a shutter glasses type stereoscopic image display device. In this experiment, the computer 70 displays the test signal of the target monocular image and the color of the disturbed monocular image on the stereoscopic image display device 60 as RGB three primary color data.

6A and 6B, "Observed side" means monocular image to be evaluated, and "Opposite side" means disturbed monocular image. The figures presented in FIGS. 6A and 6B are color difference values Δu'v 'of the uv two-dimensional color coordinate system, due to disturbed monocular images from ideal color coordinate values u' _ii v ' _ii without 3D color crosstalk. The distance between the color distorted color coordinate values u ' _ij v' _ij .

In FIG. 6A, 0.0155 indicates that the green color of the disturbed monocular image (right eye image) affects the red color of the evaluated monocular image (left eye image) so that the color coordinate is 0.0155 from the color coordinate value of the target monocular image when there is no 3D color crosstalk. This is the experimental result of shifted values. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same red. In FIG. 6A, 0.0019 indicates that the blue color of the obstructive monocular image (right eye image) affects the green color of the monocular image (left eye image) to be evaluated, and the color coordinate is 0.0019 from the color coordinate value of the target monocular image when there is no 3D color crosstalk. This is the experimental result of shifted values. Here, when there is no 3D color crosstalk, the color of the evaluated monocular image and the disturbed monocular image are the same green.

In FIG. 6B, 0.0282 indicates that the green color of the disturbed monocular image (right eye image) affects the red color of the evaluated monocular image (left eye image), and the color coordinate value is shifted by 0.0282 from the color coordinate value of the evaluated monocular image when there is no 3D color crosstalk. Experimental results. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same red. In FIG. 6B, 0.0022 indicates that the blue color of the disturbed monocular image (right eye image) affects the green color of the evaluated monocular image (left eye image), and the color coordinate value is shifted by 0.0022 from the color coordinate value of the evaluated monocular image when there is no 3D color crosstalk. Experimental results. Here, when there is no 3D color crosstalk, the color of the evaluated monocular image and the disturbed monocular image are the same green.

FIG. 7A is a diagram illustrating a 3D color crosstalk test result of CMY three primary colors experimented with a polarized glasses type stereoscopic image display device. FIG. 7B is a diagram illustrating a 3D color crosstalk test result of CMY three primary colors experimented with a 3D image display apparatus using a shutter glasses type. In this experiment, the computer 70 displays the test signal of the monocular image to be evaluated and the color of the disturbed monocular image on the stereoscopic image display device 60 as CMY three primary color data.

7A and 7B, "Observed side" means a monocular image to be evaluated, and "Opposite side" means a disturbing monocular image. The figures presented in FIGS. 7A and 7B are the color difference values Δu'v 'of the uv two-dimensional color coordinate system as color distortions due to disturbed monocular images from the ideal color coordinate values u' _ii v ' _ii without 3D color crosstalk. The distance between the color coordinate values u ' _ij v' _ij .

In FIG. 7A, 0.0022 indicates that the magenta color of the disturbed monocular image (right eye image) affects the cyan of the target monocular image (left eye image), and thus the color coordinate of the evaluated monocular image when there is no 3D color crosstalk. Experimental results show that the color coordinate value is shifted by 0.0022 from the value. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same cyan color. In FIG. 7A, 0.0067 indicates that the yellow color of the disturbed monocular image (right eye image) affects the magenta color of the evaluated monocular image (left eye image), and is 0.0067 from the color coordinate value of the evaluated monocular image when there is no 3D color crosstalk. Experimental results show that the color coordinates are shifted. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same magenta color.

In FIG. 7B, 0.0006 indicates that the magenta color of the disturbed monocular image (right eye image) affects the cyan color of the evaluated monocular image (left eye image), and the color coordinate value is 0.0006 from the color coordinate value of the evaluated monocular image when there is no 3D color crosstalk. This is the shifted experimental result. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same cyan color. In FIG. 7B, 0.0133 denotes that the magenta color of the disturbed monocular image (right eye image) affects the yellow color of the monocular image (left eye image) to be evaluated so that the color coordinate value is 0.0133 from the color coordinate value of the target monocular image when there is no 3D color crosstalk. This is a shifted experimental result. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same yellow.

FIG. 8A is a diagram illustrating a 3D color crosstalk test result of Macbeth color experimented with a polarized glasses type stereoscopic image display device. FIG. 8B is a diagram illustrating a 3D color crosstalk test result of Macbeth color experimented with a 3D image display device using a shutter glasses method. In this experiment, the computer 70 displays the test signal of the monocular image to be evaluated on the stereoscopic image display device 60 and the color of the disturbed monocular image of the Macbeth color standardized to 24 preferred colors on the stereoscopic image display device 60. Mark as one.

8A and 8B, "Observed side" means monocular image to be evaluated, and "Opposite side" means disturbed monocular image. 8A and 8B are color difference values Δu'v 'of the uv two-dimensional color coordinate system, which are color-distorted due to disturbed monocular images from an ideal color coordinate value u' _ii v ' _ii without 3D color crosstalk. The distance between the color coordinate values u ' _ij v' _ij .

In FIG. 8A, 0.0033 indicates that the light skin of the obstructive monocular image (right eye image) affects the dark skin of the monocular image (left eye image) to be evaluated so that there is no 3D color crosstalk. The experimental result of shifting the color coordinate value by 0.0033 from the color coordinate value of. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same dark skin color. In FIG. 8A, the lower 0.0029 indicates that the blue sky of the obstructive monocular image (right eye image) affects the foliage of the monocular image (left eye image) to be evaluated so that there is no 3D color crosstalk. Experimental results show that the color coordinate value is shifted by 0.0029 from the color coordinate value. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same leaf color.

In FIG. 8B, 0.0416 denotes a color coordinate value of 0.0416 from the color coordinate value of the target monocular image when there is no 3D color crosstalk because the blue light blue color of the disturbed monocular image (right eye image) affects the dark skin color of the target monocular image (left eye image). This is the shifted experimental result. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same dark skin color. In FIG. 8B, 0.0195 indicates that the color of the color of the disturbed monocular image (right eye image) affects the blue light blue color of the target monocular image (left eye image), and the color coordinate value is 0.0195 from the color coordinate value of the target monocular image when there is no 3D color crosstalk. This is the shifted experimental result. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same blue sky blue.

FIG. 9A is a diagram illustrating a 3D color crosstalk test result of gray color experimented with a 3D image display device using polarized glasses. FIG. FIG. 9B is a diagram illustrating a 3D color crosstalk test result of gray color experimented with a shutter glasses type stereoscopic image display device. FIG. In this experiment, the computer 70 displays the test signal of the evaluation target monocular image and the color of the disturbed monocular image as gray color data on the stereoscopic image display device 60. As an example of gray color data, “G127” in FIGS. 9A and 9B means gray color data in which gray levels of red data, green data, and blue data are “127”, respectively. "G63" means gray color data in which the gradation of each of red data, green data, and blue data is "63".

9A and 9B, "Observed side" means monocular image to be evaluated, and "Opposite side" means disturbed monocular image. The numerical values shown in FIGS. 9A and 9B are color difference values Δu'v 'of the uv two-dimensional color coordinate system, which are color-distorted due to disturbed monocular images from the ideal color coordinate values u' _ii v ' _ii without 3D color crosstalk. The distance between the color coordinate values u ' _ij v' _ij .

In FIG. 9A, the upper 0.0002 indicates that the gray color "G63" of the disturbed monocular image (right eye image) affects the gray color "G255" of the evaluated monocular image (left eye image), so that there is no 3D color crosstalk. The experimental result of shifting the color coordinate value by 0.0002 from the color coordinate value of. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same peak white color "G255". In FIG. 9A, 0.0011 indicates that the full white color "G255" of the disturbed monocular image (right eye image) affects the gray color "G63" of the evaluated monocular image (left eye image), so that there is no 3D color crosstalk. It is an experiment result in which the color coordinate value was shifted by 0.0011 from the color coordinate value. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is a gray color "G63".

In FIG. 9B, 0.0119 indicates that the gray color "G63" of the disturbed monocular image (right eye image) affects the peak white color "G255" of the evaluated monocular image (left eye image), so that there is no 3D color crosstalk. Experimental results show that the color coordinate value is shifted by 0.0119 from the color coordinate value. Here, when there is no 3D color crosstalk, the color of the monocular image to be evaluated and the obstructive monocular image are the same peak white color "G255". In FIG. 9B, 0.0014 indicates that the gray color "G63" of the disturbed monocular image (right eye image) affects the gray color "G127" of the evaluated monocular image (left eye image), so that there is no 3D color crosstalk. Experimental results show that the color coordinate value is shifted by 0.0014 from the value. Here, when there is no 3D color crosstalk, the color of the evaluation target monocular image and the disturbing monocular image is the same gray color "G127".

The present invention can optimize the 3D color crosstalk compensation value in the stereoscopic image display device based on the quantitative values calculated by the above-described 3D color crosstalk method. The 3D color crosstalk compensation value may be listed in a look-up table built in the display panel controllers 12 and 32. The lookup table may compensate for 3D color crosstalk by receiving left and right eye data of a 3D input image as an input address and outputting a preset 3D color crosstalk compensation value based on the 3D color crosstalk method described above.

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.

50: photometer 60: stereoscopic image display device
70: computer 200: polarized glasses
300: Shutter Glasses

Claims

In the color crosstalk evaluation method of the stereoscopic image display device for displaying the left eye image and the right eye image separated spatially or temporally,
Displaying a color of an evaluation target monocular image and a color of an obstructive monocular image on the stereoscopic image display device;
Measuring a color coordinate value of the subject monocular image by changing a color of the disturbed monocular image by using a photometer disposed in front of the display surface of the stereoscopic image display device; And
3D color crosstalk of the evaluated monocular image due to the influence of the disturbed monocular image by analyzing predistorted color difference values of the evaluated monocular image and post-distorted color difference values of the evaluated monocular image distorted by the disturbed monocular image And evaluating the color crosstalk of the stereoscopic image display device.

The method of claim 1,
Evaluating 3D color crosstalk of the evaluation target monocular image,
3D Color C / T [Δu'v '] is the 3D color crosstalk, u' _ij v ' _ij is the test signal gradation of the subject monocular image is i and the test signal gradation of the disturbing monocular image is j When u ' _ii v' _ii is a color coordinate value when the test signal gray level of the evaluation target monocular image and the test signal gray level of the disturbing monocular image are the same i,

And calculating the 3D color crosstalk based on the color crosstalk evaluation method of the stereoscopic image display device.

The method of claim 1,
The displaying of the color of the evaluation target monocular image and the color of the disturbed monocular image on the stereoscopic image display apparatus may include:
A stereoscopic display comprising any one of RGB (Red, Green, Blue) color, CMY (Cyan, Magenta, Yellow) color, Macbeth color, and gray color on the stereoscopic image display device. Color Crosstalk Evaluation Method of Image Display.

The method of claim 3, wherein
Evaluating 3D color crosstalk of the evaluation target monocular image,
And evaluating the 3D color crosstalk with respect to the RGB color, the CMY color, the Macbeth color, and the gray color.

The method according to any one of claims 1 to 4,
And one of polarizing glasses and shutter glasses in front of the light receiving surface of the photometer between the stereoscopic image display device and the photometer.