# US 2014/0198100 A1 · Method for reducing crosstalk of stereoscopic image

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- Number: US 2014/0198100 A1
- Document ID: US20140198100A1
- Status: Published application
- Kind: A1
- Application number: 13/913,497
- Filed: 2013-06-09
- Published: 2014-07-17
- Earliest claimed: 2013-01-15
- Assignees: Au Optronics Corporation
- Applicants: AU Optronics Corp.
- Inventors: Ti-Kuei Yu; Te-Wei Chan; Jen-Lang Tung
- Web page: https://patentgrep.com/patent/US20140198100A1

## CPC

- H04N 13/30: Image reproducers (optical systems for producing stereoscopic or other three-dimensional [3D] effects G02B30/00)
- H04N 13/106: Processing image signals (for multi-view video sequence encoding H04N19/597)
- G02B 30/00: Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images (in microscopes G02B21/22)
- G02B 30/22: of the stereoscopic type
- G06T 19/20: Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A stereoscopic display method includes generating a left-eye crosstalk parameter according to left-eye image data and right-eye image data; generating a right-eye crosstalk parameter according to the left-eye image data and the right-eye image data; generating calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter; generating calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter; and displaying the calibrated left-eye image data and the calibrated right-eye image data on a display apparatus.

## Claims

### Claim 1

A stereoscopic display method, comprising:
generating a left-eye crosstalk parameter according to left-eye image data and right-eye image data;
generating a right-eye crosstalk parameter according to the left-eye image data and the right-eye image data;
generating calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter;
generating calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter; and
displaying the calibrated left-eye image data and the calibrated right-eye image data on a display apparatus.

### Claim 2 (depends on 1)

The method of claim 1, wherein:
generating the left-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
generating the left-eye crosstalk parameter according to a left-eye grey level crosstalk look up table, the left-eye image data, and the right-eye image data, wherein the left-eye grey level crosstalk look up table comprises left-eye crosstalk parameters caused by the right-eye image data when the display apparatus is viewed by a left eye; and
generating the right-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
generating the right-eye crosstalk parameter according to a right-eye grey level crosstalk look up table, the left-eye image data, and the right-eye image data, wherein the right-eye grey level crosstalk look up table lists right-eye crosstalk parameters caused by the left-eye image data when the display apparatus is viewed by a right eye.

### Claim 3 (depends on 1)

The method of claim 1, wherein:
generating the left-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
displaying a first left-eye image with a first gray level, and displaying a first right-eye image with the first gray level;
measuring first left-eye brightness received by a left eye when displaying the first left-eye image and displaying the first right-eye image;
displaying the first left-eye image with the first gray level, and displaying a second right-eye image with a second gray level;
measuring second left-eye brightness received by the left eye when displaying the first left-eye image and displaying the second right-eye image;
displaying a second left-eye image with the second gray level, and displaying the second right-eye image with the second gray level;
measuring third left-eye brightness received by the left eye when displaying the second left-eye image and displaying the second right-eye image; and
generating the left-eye crosstalk parameter according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness; and
generating the right-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
displaying the first left-eye image with the first gray level, and displaying the first right-eye image with the first gray level;
measuring first right-eye brightness received by a right eye when displaying the first left-eye image and displaying the first right-eye image;
displaying the first left-eye image with the first gray level, and displaying the second right-eye image with the second gray level;
measuring second right-eye brightness received by the right eye when displaying the first left-eye image and displaying the second right-eye image;
displaying the second left-eye image with the second gray level and displaying the second right-eye image with the second gray level;
measuring third right-eye brightness received by the right eye when displaying the second left-eye image and displaying the second right-eye image; and
generating the right-eye crosstalk parameter according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness;
wherein the first gray level corresponds to the left-eye image data, and the second gray level corresponds to the right-eye image data.

### Claim 4 (depends on 3)

The method of claim 3, wherein:
generating the left-eye crosstalk parameter according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness comprises:
generating an absolute value of a ratio of a difference between the first left-eye brightness and the second left-eye brightness and a difference between the first left-eye brightness and the third left-eye brightness; and
generating the right-eye crosstalk parameter according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness comprises:
generating an absolute value of a ratio of a difference between the second right-eye brightness and the third right-eye brightness and a difference between the first right-eye brightness and the third right-eye brightness.

### Claim 5 (depends on 3)

The method of claim 3, wherein:
generating the left-eye crosstalk parameter XL according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness comprises:
X
L
=

L
aa
-
L
ab
L
aa
-
L
bb

,
wherein XL is the left-eye crosstalk parameter, Laa is the first left-eye brightness, Lab is the second left-eye brightness, Lbb is the third left-eye brightness; and
generating the right-eye crosstalk parameter XR according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness comprises:
X
R
=

R
ab
-
R
bb
R
aa
-
R
bb

,
wherein XR is the right-eye crosstalk parameter, Raa is the first right-eye brightness, Rab is the second right-eye brightness, Rbb is the third right-eye brightness.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
setting the left-eye crosstalk parameter as a threshold if the left-eye crosstalk parameter is not smaller than the threshold; and
setting the right-eye crosstalk parameter as the threshold if the right-eye crosstalk parameter is not smaller than the threshold.

### Claim 7 (depends on 1)

The method of claim 1, wherein:
generating the calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
generating the calibrated left-eye image data by dividing a difference between the left-eye image data and a product of the right-eye image data and the left-eye crosstalk parameter by a difference between 1 and a product of the left-eye crosstalk parameter and the right-eye crosstalk parameter; and
generating the calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
generating the calibrated right-eye image data by dividing a difference between the right-eye image data and a product of the left-eye image data and the right-eye crosstalk parameter by a difference between 1 and a product of the left-eye crosstalk parameter and the right-eye crosstalk parameter.

### Claim 8 (depends on 1)

The method of claim 1, wherein:
generating the calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
L
f
=
(
L
i
-
R
i
×
X
L
)
(
1
-
X
R
×
X
L
)
;
generating the calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
R
f
=
(
R
i
-
L
i
×
X
R
)
(
1
-
X
R
×
X
L
)
;
and
wherein Li is the left image data, Ri is the left image data, Lf is the calibrated left-eye image data, Rf is the calibrated right-eye image data, XL is the left-eye crosstalk parameter, XR is the right-eye crosstalk parameter.

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
receiving the left-eye image data and the right-eye image data of an image frame, the image frame comprising a plurality of image blocks.

### Claim 10

A stereoscopic display method, comprising:
receiving image data of an image frame, the image frame comprising a plurality of image blocks;
in each of the image blocks,
generating a left-eye crosstalk parameter according to left-eye image data of the image block and right-eye image data of the image block;
generating a right-eye crosstalk parameter according to the left-eye image data and the right-eye image data;
generating calibrated left-eye image data of the image block according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter; and
generating calibrated right-eye image data of the image block according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter; and
displaying calibrated left-eye image data and calibrated right-eye image data of the image blocks on a display apparatus.

### Claim 11 (depends on 10)

The method of claim 10, wherein:
each of the image blocks corresponds to a left-eye grey level crosstalk look up table and a right-eye grey level crosstalk look up table, the left-eye grey level crosstalk look up table lists left-eye crosstalk parameters caused by the right-eye image data when the display apparatus is viewed by a left eye, and the right-eye grey level crosstalk look up table lists right-eye crosstalk parameters caused by the left-eye image data when the display apparatus is viewed by a right eye;
generating the left-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
generating the left-eye crosstalk parameter according to a corresponding left-eye grey level crosstalk look up table, the left-eye image data, and the right-eye image data; and
generating the right-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
generating the right-eye crosstalk parameter according to a corresponding right-eye grey level crosstalk look up table, the left-eye image data, and the right-eye image data.

### Claim 12 (depends on 10)

The method of claim 10, wherein:
generating the left-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
displaying a first left-eye image with a first gray level and a first right-eye image with the first gray level;
measuring first left-eye brightness received by a left eye when displaying the first left-eye image and the first right-eye image;
displaying the first left-eye image with the first gray level and a second right-eye image with a second gray level;
measuring second left-eye brightness received by the left eye when displaying the first left-eye image and the second right-eye image;
displaying a second left-eye image with the second gray level and a second right-eye image with the second gray level;
measuring third left-eye brightness received by the left eye when displaying the second left-eye image and the second right-eye image; and
generating the left-eye crosstalk parameter according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness; and
generating the right-eye crosstalk parameter according to the left-eye image data and the right-eye image data comprises:
displaying the first left-eye image with the first gray level and the first right-eye image with the first gray level;
measuring first right-eye brightness received by a right eye when displaying the first left-eye image and the first right-eye image;
displaying the first left-eye image with the first gray level and the second right-eye image with the second gray level;
measuring second right-eye brightness received by the right eye when displaying the first left-eye image and the second right-eye image;
displaying the second left-eye image with the second gray level and the second right-eye image with the second gray level;
measuring third right-eye brightness received by the right eye when displaying the second left-eye image and the second right-eye image; and
generating the right-eye crosstalk parameter according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness;
wherein the first gray level corresponds to the left-eye image data, and the second gray level corresponds to the right-eye image data.

### Claim 13 (depends on 12)

The method of claim 12, wherein:
generating the left-eye crosstalk parameter according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness comprises:
generating an absolute value of a ratio of a difference between the first left-eye brightness and the second left-eye brightness and a difference between the first left-eye brightness and the third left-eye brightness; and
generating the right-eye crosstalk parameter according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness comprises:
generating an absolute value of a ratio of a difference between the second right-eye brightness and the third right-eye brightness and a difference between the first right-eye brightness and the third right-eye brightness.

### Claim 14 (depends on 12)

The method of claim 12, wherein:
generating the left-eye crosstalk parameter according to the first left-eye brightness, the second left-eye brightness, and the third left-eye brightness comprises:
X
L
=

L
aa
-
L
ab
L
aa
-
L
bb

,
wherein XL is the left-eye crosstalk parameter, Laa is the first left-eye brightness, Lab is the second left-eye brightness, Lbb is the third left-eye brightness; and
generating the right-eye crosstalk parameter according to the first right-eye brightness, the second right-eye brightness, and the third right-eye brightness comprises:
X
R
=

R
ab
-
R
bb
R
aa
-
R
bb

,
wherein XR is the right-eye crosstalk parameter, Raa is the first right-eye brightness, Rab is the second right-eye brightness, Rbb is the third right-eye brightness.

### Claim 15 (depends on 10)

The method of claim 10, further comprising:
setting the left-eye crosstalk parameter to have a value of a threshold if the left-eye crosstalk parameter is greater than the threshold; and/or
setting the right-eye crosstalk parameter to have the value of the threshold if the right-eye crosstalk parameter is greater than the threshold.

### Claim 16 (depends on 15)

The method of claim 15, wherein:
the left-eye image data and the right-eye image data are between a lower bound and an upper bound.

### Claim 17 (depends on 10)

The method of claim 10, wherein:
generating the calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
generating the calibrated left-eye image data by dividing a difference between the left-eye image data and a product of the right-eye image data and the left-eye crosstalk parameter by a difference between 1 and a product of the left-eye crosstalk parameter and the right-eye crosstalk parameter; and
generating the calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
generating the calibrated right-eye image data by dividing a difference between the right-eye image data and a product of the left-eye image data and the right-eye crosstalk parameter by a difference between 1 and a product of the left-eye crosstalk parameter and the right-eye crosstalk parameter.

### Claim 18 (depends on 10)

The method of claim 10, wherein:
generating the calibrated left-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
L
f
=
(
L
i
-
R
i
×
X
L
)
(
1
-
X
R
×
X
L
)
;
generating the calibrated right-eye image data according to the left-eye image data, the right-eye image data, the left-eye crosstalk parameter, and the right-eye crosstalk parameter comprises:
R
f
=
(
R
i
-
L
i
×
X
R
)
(
1
-
X
R
×
X
L
)
;
and
wherein Li is the left image data, Ri is the left image data, Lf is the calibrated left-eye image data, Rf is the calibrated right-eye image data, XL is the left-eye crosstalk parameter, XR is the right-eye crosstalk parameter.

### Claim 19

A stereoscopic display system, comprising:
a data driver, configured to receive left-eye image data and right-eye image data of an image frame, the image frame comprising a plurality of image blocks;
a stereo display apparatus, electrically connected to the data driver and configured to display calibrated left-eye image data of the image blocks and calibrated right-eye image data of the image blocks;
a memory, electrically connected to the data driver;
a left-eye grey level crosstalk look up table stored in the memory, comprising left-eye crosstalk parameters caused by the right-eye image data when the display apparatus is viewed by a left eye; and
a right-eye grey level crosstalk look up table stored in the memory, comprising right-eye crosstalk parameters caused by the left-eye image data when the display apparatus is viewed by a right eye.

### Claim 20 (depends on 19)

The system of claim 19, wherein the stereo display apparatus comprises:
one of a time-multiplexed stereo display panel and a spatial-multiplexed stereo display panel.