Color gamut mapping method and color gamut mapping device

Patent metadata

Field	Value
Publication number	US-12015885-B2
Application number	US-202117622811-A
Country	US
Kind code	B2
Filing date	Dec 20, 2021
Priority date	Dec 13, 2021
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

The present application provides a color gamut mapping method and a color gamut mapping device for use in a splicing display device. Display screens in the splicing display device have different color gamuts. By mapping the color gamuts of multiple display screens to the display screen which is the uniquely determined display screen in the splicing display device, the color gamuts of all the display screens in the splicing display device are the same, and colors displayed on different screens are also the same. Accordingly, the present application improves uneven images and the image quality.

First claim

What is claimed is:

1. A color gamut mapping method, for use in a splicing display device, wherein the splicing display device comprises a first display screen and a second display screen spliced together, and a color gamut of the first display screen in a preset color gamut coordinate system corresponds to a first color gamut triangle, a color gamut of the second display screen in the preset color gamut coordinate system corresponds to a second color gamut triangle corresponding to the first color gamut triangle formed in a preset coordinate system, the color gamut of the second display screen corresponds to the second color gamut triangle formed in the preset coordinate system, and the color gamuts of the first display screen and the second display screen are different; wherein the color gamut mapping method comprises:
rotating the first color gamut triangle so that color gamut sides of the rotated first color gamut triangle are parallel to respective color gamut sides of the second color gamut triangle to obtain a third color gamut triangle;
determining a color gamut adjustment scaling factor of the first color gamut triangle according to the third color gamut triangle and the first color gamut triangle; and
scaling the third color gamut triangle according to the color gamut adjustment scaling factor, such that the third color gamut triangle is converted to the second color gamut triangle, and the color gamut of the first display screen matches the color gamut of the second display screen.

2. The color gamut mapping method according to claim 1 , wherein the first color gamut triangle comprises a first red main vertex, a first green main vertex, and a first blue main vertex, and the second color gamut triangle comprises a second red main vertex, a second green main vertex, and a second blue main vertex;
in the step of rotating the first color gamut triangle, so that the color gamut sides of the rotated first color gamut triangle are parallel to the respective color gamut sides of the second color gamut triangle to obtain the third color gamut triangle, the color gamut mapping method comprises:
determining a position of a color gamut white point in the second display screen;
rotating the first red main vertex, the first green main vertex, and the first blue main vertex around the color gamut white point, so that the color gamut sides of the rotated first color gamut triangle are parallel to the respective color gamut sides of the second color gamut triangle to obtain the third color gamut triangle.

3. The color gamut mapping method according to claim 2 , wherein in the step of rotating the first red main vertex, the first green main vertex, and the first blue main vertex around the color gamut white point, so that the color gamut sides of the rotated first color gamut triangle are parallel to the respective color gamut sides of the second color gamut triangle to obtain the third color gamut triangle, the color gamut mapping method comprises:
rotating a first connection line around the color gamut white point to an extension line of a second connection line, and determining that a rotation intersection point is a third red main vertex of the third color gamut triangle, wherein a length of the first connection line is equal to a length of a third connection line, the first connection line is a connecting line between the color gamut white point and the first red main vertex, the second connection line is a connecting line between the color gamut white point and the second red main vertex, and the third connection line is a connecting line between the color gamut white point and the third red main vertex;
rotating a fourth connecting line around the color gamut white point to an extension line of a fifth connection line, and determining that a rotation intersection point is a third green main vertex of the third color gamut triangle, wherein a length of the fourth connection line is equal to a length of a sixth connection line, the fourth connection line is a connecting line between the color gamut white point and the first green main vertex, the fifth connection line is a connecting line between the color gamut white point and the second green main vertex, and the sixth connection line is a connecting line between the color gamut white point and the third green main vertex; and
rotating a seventh connection line around the color gamut white point to an extension line of an eighth connection line, and determining that a rotation intersection point is a third blue main vertex of the third color gamut triangle, wherein a length of the seventh connection line is equal to a length of a ninth connection line, and the seventh connection line is a connecting line between the color gamut white point and the first blue main vertex, and the eighth connection line is a connecting line between the color gamut white point and the second blue main vertex, and the ninth connection line is a connecting line between the color gamut white point and the third blue main vertex;
wherein an enclosed area among the third red main vertex, the third blue main vertex, and the third green main vertex is the third color gamut triangle.

4. The color gamut mapping method according to claim 3 , wherein the step of determining the color gamut adjustment scaling factor of the first color gamut triangle according to the third color gamut triangle and the first color gamut triangle comprises:
calculating a first angle parameter based on the connecting line between each vertex in the first color gamut triangle and the color gamut white point;
calculating a second angle parameter based on the connecting line between each vertex in the second color gamut triangle and the color gamut white point; and
calculating a color gamut adjustment scaling factor of the first color gamut triangle according to the first angle parameter and the second angle parameter.

5. The color gamut mapping method according to claim 4 , wherein the step of calculating the first angle parameter based on the connecting line between each vertex in the first color gamut triangle and the color gamut white point comprises:
determining a first included angle defined by the first green main vertex, the color gamut white point, and the first red main vertex;
determining a second included angle defined by the first red main vertex, the color gamut white point, and the first green main vertex; and
determining a third included angle defined by the first red main vertex, the color gamut white point, and the first blue main vertex;
wherein the first angle parameter comprises the first included angle, the second included angle, and the third included angle.

6. The color gamut mapping method according to claim 5 , wherein the step of calculating the second angle parameter based on the connecting line between each vertex in the third color gamut triangle and the color gamut white point comprises:
calculating a fourth included angle defined by the third blue main vertex, the color gamut white point, and the third red main vertex;
calculating a fifth included angle defined by the third red main vertex, the color gamut white point, and the third green main vertex; and
calculating a sixth included angle defined by the third red main vertex, the color gamut white point, and the third blue main vertex;
wherein the second angle parameter comprises the fourth included angle, the fifth included angle, and the sixth included angle.

7. The color gamut mapping method according to claim 6 , wherein the step of calculating the color gamut adjustment scaling factor of the first color gamut triangle according to the first angle parameter and the second angle parameter comprises:
calculating a first color gamut adjustment scaling factor according to the first inc

Assignees

• Huizhou China Star Optoelectronics Display Co Ltd
• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Wang Zhongbin

Classifications

• H04N1/6052

  Matching two or more picture signal generators or two or more picture reproducers · CPC title

• H04N1/6061

  involving the consideration or construction of a gamut surface · CPC title

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• G09F9/3026

  Video wall, i.e. stackable semiconductor matrix display modules (video wall control systems G06F3/1446, G09G2300/026) · CPC title

• H04N1/6027

  Correction or control of colour gradation or colour contrast (H04N1/6058 takes precedence) · CPC title