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Method for smoothing knee 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 the problems of disharmonious image color transition and poor image quality, and achieve the effect of harmonious color transition, increased layering, and smooth connection

Active Publication Date: 2007-11-07
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 smooth inflection point in the multi-segment Gamma curve correction process for the disadvantages that the inflection point that occurs during the correction process of the multi-segment Gamma curve will cause disharmony in the image color transition displayed by the video display device and poor image quality. Methods

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

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[0039] Gamma values ​​of multi-segment Gamma curves are obtained from the data analyzed by the industrial computer and color analyzer through optical signal acquisition and signal measurement, and a most basic Gamma table is obtained. The Gamma table adopts 256 gray scales, as shown in Figure 1. Smooth inflection point processing is performed on the Gamma curve described in the Gamma table, including the following steps:

[0040] 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] ,As shown in Figure 1;

[0041] Secondly, adjust the 256 calibration points sequentially according to the flow chart shown in Figure 2:

[0042] Finally, according to the flow chart shown in Figure 3, the adjusted 256 calibration points are sequentially connected to obtain 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 Applications(China)
IPC IPC(8): G09G5/10G09G5/00
Inventor 江友才张俊喜苏容强
Owner SICHUAN CHANGHONG ELECTRIC CO LTD