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Method for smoothing turning point in process of multi-segment Gamma curve correction

A technology of curve correction and correction points, which is applied in the field of smoothing inflection points in the multi-segment Gamma curve correction process, can solve problems such as poor image quality and disharmonious image color transition, and achieve the effect of increasing layering, harmonious color transition, and smooth connection

Active Publication Date: 2010-01-20
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a smooth inflection point in the multi-segment Gamma curve correction process for the disadvantages that the inflection point that appears in the correction process of the multi-segment Gamma curve will cause the image color transition displayed by the video display device to be disharmonious and the image quality is poor. Methods

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  • Method for smoothing turning point in process of multi-segment Gamma curve correction
  • Method for smoothing turning point in process of multi-segment Gamma curve correction
  • Method for smoothing turning point in process of multi-segment Gamma curve correction

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Embodiment

[0047] The Gamma value of the multi-segment Gamma curve is obtained from the data analyzed by the industrial computer and the color analyzer through the optical signal acquisition signal measurement, and the most basic Gamma table is obtained. The Gamma table adopts 256 gray scales, such as figure 1 shown. Smooth inflection point processing is performed on the Gamma curve described in the Gamma table, including the following steps:

[0048] First, take 256 points on the Gamma curve as calibration points, and each gray scale of the Gamma gray scale corresponds to a calibration point: the kth gray scale is the calibration point k, where k is an integer, and k∈[0, 256] ,Such as figure 1 shown;

[0049] Second, follow the figure 2 The flow chart shown adjusts 256 calibration points sequentially:

[0050] Finally, follow image 3 The flow chart shown connects the adjusted 256 correction points sequentially, thereby obtaining a smoothly connected Gamma curve.

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Abstract

This invention relates to a method for smoothing inflexions in the process of calibration of multi-section Gamma curve including: taking multiple points on Gamma curve as the calibration points, selecting three continuous calibration points: k, k+1, k+2 to connect k with k+2 in line and judge positions of k+1 and the line: connecting k with k+1 in protrusion at the upper part, connecting k with k+1 in concave line at the lower part and connecting k + 1 on line to connect all calibration points accordingly, which smoothes inflexions in the calibration process of multiple sections of Gamma curves.

Description

technical field [0001] The invention relates to a Gamma curve correction technology of a video display device, in particular to a method for smoothing inflection points in the multi-segment Gamma curve correction process. 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. 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 details of dark parts. [0003] In order to achieve a more ideal display effect, a Gamma curve i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G5/10G09G5/00
Inventor 江友才张俊喜苏容强
Owner SICHUAN CHANGHONG ELECTRIC CO LTD