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Method for correcting multi-segmented Gamma curve

A curve correction, curve technology, applied in the direction of cathode ray tube indicators, instruments, static indicators, etc., can solve the problems of poor definition, poor consistency, poor image layering, etc., to achieve high definition and excessive image color. Uniform, fine-grained effect

Active Publication Date: 2007-11-21
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a multi-segment Gamma curve correction method for the problems of poor layering, poor consistency and poor definition of images displayed by current video display devices

Method used

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  • Method for correcting multi-segmented Gamma curve

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Embodiment

[0030] The Gamma gray scale corresponding to the Gamma curve of the flat-panel TV is 256 levels. Referring to Figure 1, the horizontal axis is the Gamma gray scale number of the multi-segment Gamma curve, and the vertical axis is the brightness percentage (expressed in percentage) of the multi-segment Gamma curve. The Gamma curve is divided into three parts according to different Gamma gray scale ranges:

[0031] Dark gray scale part: the Gamma curve segment from the origin to point A, the corresponding Gamma gray scale is 0-128, and the Gamma curve coefficient is 2.3;

[0032] Bright gray scale part: the Gamma curve segment from point B to point C, the number of gray scales is 180-255, and the Gamma curve coefficient is 1.9;

[0033] The middle part: the Gamma curve segment from point A to point B, the gamma gray scale is 129~179, the gamma curve segment from point A to point B is divided into multiple segments, and the gamma curve coefficient of each segment decreases gradua...

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Abstract

A method for calibrating multi-section Gamma curve includes dividing Gamma curve to be three parts of dark grey level part and intermediate part as well as bright grey level part according to different scope of grey level value, setting coefficient of Gamma curve at dark grey level part to be 2.0-2.4 and coefficient of Gamma curve at bright grey level part to be 1.5-1.9, smoothly transiting dark grey level part to be bright grey level part in linear way.

Description

technical field [0001] The invention relates to a Gamma curve correction technology of a video display device, in particular to a multi-segment Gamma curve correction method. Background technique [0002] In video display devices such as monitors and televisions, there will be deviations in brightness between the input image and the actual output image, and Gamma curve correction technology is a method to correct this display deviation of the image. The Gamma gray levels corresponding to the Gamma curve of the video display device are generally 64 levels, 256 levels, 1024 levels, etc. Generally, when the Gamma curve coefficient of the Gamma curve is greater than 1, the highlight part of the image is compressed and the dark part is expanded; when the Gamma curve coefficient of the Gamma curve is less than 1, the highlight part of the image is expanded and the dark part is expanded. Compression, gamma curve correction techniques are generally used to smoothly expand the detai...

Claims

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Application Information

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IPC IPC(8): G09G5/10G09G5/00
Inventor 江友才张俊喜苏容强杨伟茂
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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