A Method for Estimated Gray Scale Curve of Liquid Crystal Display by Human Vision

A liquid crystal display and human vision technology, applied in the field of color science and technology, can solve the problems that ordinary users cannot operate, and achieve the effect of simple display personalization

Inactive Publication Date: 2017-01-18
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0031] The purpose of the present invention is to overcome the deficiency that the prior art depends on the instrument and cannot be operated by ordinary users, and provides a kind of non-linear relationship between the numerical values ​​displayed by the three channels of the display and the normalized brightness of the display, that is, liquid crystal Method of display gray scale curve

Method used

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  • A Method for Estimated Gray Scale Curve of Liquid Crystal Display by Human Vision
  • A Method for Estimated Gray Scale Curve of Liquid Crystal Display by Human Vision
  • A Method for Estimated Gray Scale Curve of Liquid Crystal Display by Human Vision

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Embodiment 1

[0066]Taking a liquid crystal display with a digital drive value of 8 bits as an example, the steps of visually estimating the gray scale curve (TRC) of this display with the human eye are described in detail as follows:

[0067] (1) Programming development such as Figure 4 interface software. The software can realize all the functions in step (1) of the content of the invention. The first line of the software interface displays 9 identical halftone patterns, the second line displays 9 different monochrome patterns, the RGB digital value of the second line image from left to right is the same as that of the fifth image (screen center) RGB digital value The magnitude relationship is -4, -3, -2, -1, +1, +2, +3, +4, so that the left and right four images can help the human eye to compare, and finally determine the fifth image ( The center of the screen) RGB value; the software can realize the increase or decrease of the single-channel RGB value through the "↑" and "↓" keys on ...

Embodiment 2

[0085] Embodiment 2: steps one and two are the same as embodiment 1. The difference is that the mathematical model in step three adopts the GOG model. The GOG model of the red (R) channel is:

[0086] R ( d R ) = ( k g , R d R + k o , R ) γ R , ( k ...

Embodiment 3

[0096] Embodiment 3: step one and two are the same as embodiment 1. The difference is that the mathematical model in step three adopts the S-curve model. The S-curve model of the red (R) channel is:

[0097] R ( d R ) = A r d R α r d R β r + C r - - - ( 10 )

[0098] where A r 、α r , β r 、C r is the undetermined coefficient, d R Normalizes the amount of display digital drive for the R channel, R(d R ) is the normalized brightness for the R channel. The R channel has 8 kinds of halftone patterns, which can correspond to the above 8 sets of equations. It is known that R(d R ) a...

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Abstract

The invention discloses a method for estimating the gray-scale curve of a liquid crystal display with human vision and belongs to the field of the color science and technique. The method is conducted on the three channels R, G and B respectively and comprises the steps of designing eight halftone patterns with brightness becoming higher; adjusting the display digital quantity of a single monochrome block by means of human vision to enable the brightness of the monochrome block to be matched with the brightness of each halftone pattern; substituting matching data into a mathematical model for describing the grey-scale curve, working out an optimal undetermined coefficient with the least square method, and obtaining the corresponding relations between the numerical magnitudes displayed by the three channels of the display and the normalized brightness magnitude of the display. The method has the advantages that a display screen brightness measuring instrument is not needed, ordinary users can obtain the grey-scale curve of the liquid crystal display according to stipulation matching, and convenience is brought to the ordinary users; meanwhile, compared with traditional Gamma estimation, the method is more accurate and reliable.

Description

Technical field: [0001] The invention belongs to the field of color science and technology. The invention relates to a method for visually estimating the gray scale curve (also called tone reproduction curve, TRC) of a liquid crystal display. Background technique: [0002] Images obtained from input devices such as cameras and scanners show the same color problem on different displays (output devices), that is, what is often called "what you see is what you get" is a hot spot in color science and technology research. In order to achieve the consistency of color transfer between different devices, a color management system (Color Management System, CMS) was born. The characterization of display devices, that is, the conversion from a device-dependent color space to a device-independent color space is an important part of color management, and it needs professional and technical personnel to complete in applications that require high color accuracy. [0003] With the rapid d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/60H04N1/52G09G3/36G09G5/00
Inventor 黄小乔石俊生余鸿飞邰永航陈载清云利军
Owner YUNNAN NORMAL UNIV
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