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Method and device for adjusting color temperature of video image

A video image, color temperature adjustment technology, applied in the direction of color signal processing circuit, etc., can solve the problems of poor video image display effect, inconsistent color temperature, inconsistent video image color temperature, etc., to improve the display effect.

Active Publication Date: 2014-12-03
SHENZHEN AOTO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method for adjusting the color temperature of a video image, which aims to solve the problem that the color temperature of the video image is inconsistent or uneven under different brightnesses due to the inherent defects of the scanning algorithm and the driving mode of the LED display driver IC. When the color temperature of the video image is inconsistent or uneven under different brightness conditions, the LED display screen cannot display the video image softly, resulting in poor display effect of the video image

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  • Method and device for adjusting color temperature of video image

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Embodiment 1

[0026] refer to figure 2 , figure 2 It is an implementation flowchart of a method for adjusting the color temperature of a video image provided by an embodiment of the present invention, and is described in detail as follows:

[0027] In step S201, the gamma GAMMA fine-tuning module establishes a color temperature feedback channel connected to the LED display in the video image acquisition card;

[0028] Among them, the video image acquisition card is FPGA, and the video GAMMA correction algorithm can be added to the FPGA code of the acquisition card to easily and effectively perform GAMMA fine-tuning on the video image, thereby compensating for the defects of the back-end scanning algorithm for GAMMA correction.

[0029] In step S202, the color temperature of the video image fed back by the LED display screen under different brightness is received through the color temperature feedback channel;

[0030] Wherein, the white balance device in the LED display screen feeds bac...

Embodiment 2

[0037] This embodiment describes the specific implementation process of the gamma GAMMA fine-tuning module in the video image acquisition card to establish a color temperature feedback channel connected to the LED display, as follows:

[0038] The gamma GAMMA fine-tuning module establishes a color temperature feedback channel connected to the LED display screen through the set communication interface in the video image acquisition card.

[0039] Wherein, the set communication interface can be set by the user or set by the system, which is not limited here.

[0040] In the embodiment of the present invention, since the color temperature feedback channel connected to the LED display is established, it is ensured that the LED display can feed back the color temperature to the GAMMA fine-tuning module in real time.

Embodiment 3

[0042] refer to image 3 , image 3 It is the specific implementation flowchart of the video signal collected in the video image capture card that is adjusted by adopting the GAMMA algorithm provided by the present embodiment, and is described in detail as follows:

[0043] In step S301, in the GAMMA fine-tuning module, the GAMMA algorithm is used to generate the red pixel GAMMA value and the blue pixel GAMMA value of the video signal collected in the video image capture card;

[0044] In step S302, adjust the generated red pixel GAMMA value to the pre-stored red pixel GAMMA value, and adjust the generated blue pixel GAMMA value to the pre-stored blue pixel GAMMA value.

[0045] For illustration, refer to Figure 4 , Figure 4 It is the implementation flowchart of step S302, described in detail as follows:

[0046] In step S401, the brightness value of the video image fed back by the LED display screen is received;

[0047] In step S402, adjust the generated red pixel GAM...

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Abstract

The invention belongs to the technical field of display output and provides a method and device for adjusting the color temperature of a video image. The method comprises the steps that a GAMMA fine adjustment module establishes a color temperature feedback channel connected with an LED display screen in a video image capture card; the color temperatures, under different levels of brightness, of a video image fed back by the LED display screen are received through the color temperature feedback channel; a video signal captured by the video image capture card is adjusted with the GAMMA algorithm until the received color temperatures, under different levels of brightness, of the video image and a preset color temperature tend to be consistent. By the adoption of the method and device, it is guaranteed that the color temperatures, under different grey levels, of the video image tend to be consistent, inconsistent white balance of the LED display screen is avoided, and therefore the problem that when the color temperatures of the video image are inconsistent or uneven under different levels of brightness, the LED display screen can not display the video image softly and the video image display effect is poor is solved, and the video image display effect is improved.

Description

technical field [0001] The invention belongs to the technical field of display output, in particular to a method and device for adjusting the color temperature of video images. Background technique [0002] The video signal must be corrected before being input to the display to adapt to the luminous and electrical characteristics of the display, otherwise serious color distortion will occur. For illustration, refer to figure 1 , figure 1 It is the structural block diagram of the existing GAMMA correction system. The video signal passes through the image acquisition card, performs GAMMA correction through the scanning card, and then passes through the LED drive circuit, and then the corrected video signal enters the LED display. [0003] However, the existing GAMMA correction system uses a scanning algorithm to adjust the mapping curve of the video image grayscale data output by the LED screen video image acquisition card to the LED display driver ICP grayscale image data. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/73H04N9/69
Inventor 何昆鹏吴涵渠
Owner SHENZHEN AOTO ELECTRONICS
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