Apparatus and Method for Measuring Picture Quality of Stereoscopic Display Device, and Picture Quality Analyzing Method Using the Same

• US 20120127283A1
• Filed: 11/18/2011
• Published: 05/24/2012
• Est. Priority Date: 11/19/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: KIM, JaeHong
• Granted Patent: US 9,081,200 B2
• Time in Patent Office: Days
• US Class Current: 348/51
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: H04N 13/327 Calibration thereof
• CPC Class Codes: H04N 13/341 using temporal multiplexing

Abstract

Disclosed are an apparatus and method for measuring picture quality of a stereoscopic display device, and a picture quality analyzing method using the same, which quantify a motion artifact of a 3D moving picture in consideration of even an undesired moving picture artifact caused by a motion and gray-to-gray crosstalk, and moreover measure a motion blur. The picture quality measuring apparatus includes a pattern generator, a 3D display device, a polarization member, a following camera, and an analyzer. The pattern generator generates a right-eye and a left-eye moving picture pattern which move at a predetermined scroll speed. The 3D display device displays the right-eye and left-eye moving picture pattern inputted from the pattern generator. The following camera follows respective boundary portions of the right-eye and left-eye moving picture pattern, which pass through the polarization member and are incident on the following camera, to measure luminance.

Claims

1. An apparatus for measuring picture quality of a stereoscopic display device comprising:

a pattern generator generating a right-eye moving picture pattern and a left-eye moving picture pattern which move at a predetermined scroll speed;

a Three-Dimensional (3D) display device displaying the right-eye moving picture pattern and left-eye moving picture pattern inputted from the pattern generator, on a screen;

a polarization member selectively passing the right-eye moving picture pattern and left-eye moving picture pattern displayed on the 3D display device;

a following camera following respective boundary portions of the right-eye moving picture pattern and left-eye moving picture pattern, which pass through the polarization member and are incident on the following camera, to measure luminance; and

an analyzer analyzing the luminance measured by the following camera to generate a Moving Picture Response Curve (MPRC).

2. The apparatus according to claim 1, wherein the MPRC is schematized by a change of luminance which occurs with time in the boundary portion.

3. The apparatus according to claim 1, wherein,

the right-eye moving picture pattern and left-eye moving picture pattern have a negative parallax by which a 3D picture is shown to protrude from the screen of the 3D display device, or

the right-eye moving picture pattern and left-eye moving picture pattern have a positive parallax by which the 3D picture is shown to dent from the screen of the 3D display device.

4. The apparatus according to claim 1, wherein each of the right-eye moving picture pattern and left-eye moving picture pattern comprises:

a first grayscale pattern area having a grayscale level within a range from a black grayscale level to a white grayscale level; and

a second grayscale pattern area having the same grayscale level as the first grayscale pattern area, or a grayscale level different from the first grayscale pattern area.

5. The apparatus according to claim 4, wherein the following camera follows a boundary portion between the first and second grayscale pattern areas to measure luminance.

6. The apparatus according to claim 5, wherein,

the analyzer analyzes a right-eye luminance value of the boundary portion of the right-eye moving picture pattern measured by the following camera to generate a right-eye MPRC, and

the analyzer analyzes a left-eye luminance value of the boundary portion of the left-eye moving picture pattern measured by the following camera to generate a left-eye MPRC.

7. The apparatus according to claim 1, wherein the 3D display device binocularly combines the right-eye moving picture pattern and left-eye moving picture pattern, and displays the binocularly combined right-eye moving picture pattern and left-eye moving picture pattern alternately per frame, on the screen.

8. The apparatus according to claim 7, wherein the 3D display device generates and outputs a right-eye shutter control signal and a left-eye shutter control signal respectively corresponding to the right-eye moving picture pattern and left-eye moving picture pattern displayed on the screen.

9. The apparatus according to claim 8, wherein the polarization member comprises:

a right-eye shutter passing only the right-eye moving picture pattern according to the right-eye shutter control signal; and

a left-eye shutter passing only the left-eye moving picture pattern according to the left-eye shutter control signal.

10. The apparatus according to claim 1, wherein the 3D display device binocularly combines the right-eye moving picture pattern and left-eye moving picture pattern, and displays the binocularly combined right-eye moving picture pattern and left-eye moving picture pattern alternately on one screen.

11. The apparatus according to claim 10, wherein the polarization member comprises:

a right-eye glasses comprising a right-eye polarization filter which passes only the right-eye moving picture pattern; and

a left-eye glasses comprising a left-eye polarization filter which passes only the left-eye moving picture pattern.

12. The apparatus according to claim 1, further comprising a photo sensor to synchronize driving of the 3D display device and driving of the following camera.

13. A method of measuring picture quality of a stereoscopic display device comprising:

generating a right-eye moving picture pattern and a left-eye moving picture pattern which move at a predetermined scroll speed;

displaying the right-eye moving picture pattern and left-eye moving picture pattern on a screen of a Three-Dimensional (3D) display device;

selectively passing, by a polarization member, the right-eye moving picture pattern and left-eye moving picture pattern displayed on the 3D display device;

following, by a following camera, respective boundary portions of the right-eye moving picture pattern and left-eye moving picture pattern, which pass through the polarization member, to measure luminance; and

analyzing the luminance measured by the following camera to generate a Moving Picture Response Curve (MPRC).

14. The method according to claim 13, wherein the MPRC is schematized by a change of luminance which occurs with time in the boundary portion.

15. The method according to claim 13, wherein,

the right-eye moving picture pattern and left-eye moving picture pattern have a negative parallax by which a 3D picture is shown to protrude from the screen of the 3D display device, or

the right-eye moving picture pattern and left-eye moving picture pattern have a positive parallax by which the 3D picture is shown to dent from the screen of the 3D display device.

16. The method according to claim 13, wherein each of the right-eye moving picture pattern and left-eye moving picture pattern comprises:

a first grayscale pattern area having a grayscale level within a range from a black grayscale level to a white grayscale level; and

a second grayscale pattern area having the same grayscale level as the first grayscale pattern area, or a grayscale level different from the first grayscale pattern area.

17. The method according to claim 16, wherein the following camera follows a boundary portion between the first and second grayscale pattern areas to measure luminance.

18. The method according to claim 17, wherein the generating of a Moving Picture Response Curve (MPRC) comprises:

analyzing a right-eye luminance value of the boundary portion of the right-eye moving picture pattern measured by the following camera to generate a right-eye MPRC; and

analyzing a left-eye luminance value of the boundary portion of the left-eye moving picture pattern measured by the following camera to generate a left-eye MPRC.

19. The method according to claim 13, wherein the displaying of the right-eye moving picture pattern and left-eye moving picture pattern comprises:

binocularly combining the right-eye moving picture pattern and left-eye moving picture pattern; and

displaying the binocularly combined right-eye moving picture pattern and left-eye moving picture pattern alternately per frame, on the screen.

20. The method according to claim 19, wherein the displaying of the right-eye moving picture pattern and left-eye moving picture pattern comprises generating and outputting a right-eye shutter control signal and a left-eye shutter control signal respectively corresponding to the right-eye moving picture pattern and left-eye moving picture pattern displayed on the screen.

21. The method according to claim 20, wherein the selectively passing of the right-eye moving picture pattern and left-eye moving picture pattern by the polarization member comprises passing only the right-eye moving picture pattern according to the right-eye shutter control signal, or passing only the left-eye moving picture pattern according to the left-eye shutter control signal.

22. The method according to claim 13, wherein the displaying of the right-eye moving picture pattern and left-eye moving picture pattern comprises:

binocularly combining the right-eye moving picture pattern and left-eye moving picture pattern; and

displaying the binocularly combined right-eye moving picture pattern and left-eye moving picture pattern alternately on one screen.

23. The method according to claim 22, wherein the selectively passing of the right-eye moving picture pattern and left-eye moving picture pattern by the polarization member comprises:

passing only the right-eye moving picture pattern with a right-eye polarization filter, or passing only the left-eye moving picture pattern with a left-eye polarization filter.

24. The method according to claim 13, further comprising synchronizing, by a photo sensor, driving of the 3D display device and driving of the following camera.

25. A method of analyzing picture quality of a stereoscopic display device comprising:

generating a Moving Picture Response Curve (MPRC) of Three-Dimensional (3D) display device;

calculating an artifact width on the basis of the MPRC; and

calculating a 3D motion artifact width by dividing the artifact width by the scroll speed,

wherein the generating a Moving Picture Response Curve (MPRC) of Three-Dimensional (3D) display device comprises;

generating a right-eye moving picture pattern and a left-eye moving picture pattern which move at a predetermined scroll speed;

displaying the right-eye moving picture pattern and left-eye moving picture pattern on a screen of the 3D display device;

selectively passing, by a polarization member, the right-eye moving picture pattern and left-eye moving picture pattern displayed on the 3D display device;

following, by a following camera, respective boundary portions of the right-eye moving picture pattern and left-eye moving picture pattern, which pass through the polarization member, to measure luminance; and

analyzing the luminance measured by the following camera to generate the MPRC.

26. The method according to claim 25, wherein the artifact width is a sum of the number of pixels in a first shadow area due to a depth from the screen of the 3D display device to a stereoscopic phase and the number of pixels in a second shadow area due to a display type of a moving picture pattern displayed on the screen of the 3D display device, between an initial luminance value and final luminance value of the MPRC for the boundary portion.

27. The method according to claim 26, further comprising calculating a blurred edge width according to the number of pixels in a blurred area corresponding to the initial luminance value and second shadow area.

28. The method according to claim 25, wherein the artifact width is the number of pixels in a shadow area due to a depth from the screen of the 3D display device to a stereoscopic phase, between an initial luminance value and final luminance value of the MPRC for the boundary portion.

29. The method according to claim 28, further comprising calculating a blurred edge width according to the number of pixels in a blurred area corresponding to the initial luminance value and shadow area.

30. The method according to claim 25, further comprising calculating a 3D motion artifact time by dividing the artifact width by a multiplication of the scroll speed and a frame rate.