A new measurement method for contrast sensitivity and color difference threshold characteristics of human eyes

2021 ◽  
Author(s):  
Jiyan Zhang ◽  
Lei Yang ◽  
Wenli Liu ◽  
Mingliang Gao
Keyword(s):  
Contrast Sensitivity ◽  
Measurement Method ◽  
Color Difference ◽  
Difference Threshold ◽  
Human Eyes

Application of CIEDE2000 Color Difference Formula in Jet Fuel Silver Strip Corrosion Color Recognition

2012 ◽  
Vol 531-532 ◽  
pp. 54-57 ◽  
Author(s):  
Li Ping Tong ◽  
Bin Peng ◽  
Yi Wei Fei ◽  
Hong Wei Yang
Keyword(s):  
Chromatic Aberration ◽  
Color Difference ◽  
Jet Fuel ◽  
Color Recognition ◽  
Difference Formula ◽  
Human Eyes

In order to eliminate the human eyes’ subjective differences in the level recognition of the jet fuel’s silver corrosion, chromatic aberration system is used to calculate chromatic aberration between the image of the standard colorimetric board and the experiment silver corrosion. By contrast, this paper chooses the least chromatic aberration to estimate the level of silver corrosion. The CIEDE2000 of the color difference formula, which can match with person vision theoretically, is applied in the chromatic aberration system at present, and can reflect the minor differences in color correctly. so this paper attempts to use CIEDE2000 color formula to determine the silver strip corrosion, which can reduce the influence of professionals’ subjective factors, and these results are more objective and accurate, which proves the actual feasibility of this method.

Contribution of Green Jadeite-Jade’s Chroma Difference Based on CIE 1976 L*a*b* Uniform Color Space

2010 ◽  
Vol 177 ◽  
pp. 620-623 ◽  
Author(s):  
Ying Guo ◽  
Jun Zhang ◽  
Tao Mo
Keyword(s):  
Color Space ◽  
Color Perception ◽  
Correlation Coefficients ◽  
Color Difference ◽  
Green Color ◽  
Difference Formula ◽  
Positive Linear Correlation ◽  
Cie Lab ◽  
Human Eyes ◽  
The Impact

The correlations between lightness and chroma, lightness difference and color difference, chroma difference and color difference were studied to evaluate the impact of lightness on color. Based on color difference formula CIE LAB in the uniform color space CIE L*a*b* it is learnt that H*ab of jadeite jade green colors has made little contribution to E*ab. Given the fact that human eyes are relatively sensitive to the color perception of lightness difference and that lightness and chroma affect each other, lightness of jadeites has been divided into two groups: while the lightness of green is relatively low (L*  19.52), lightness and chroma have positive linear correlation (correlation coefficient L*  C* = 0.971), which means the higher lightness the higher chroma and brings brighter green color; while L* > 19.52 , there is no one-to-one correspondence between lightness and chroma, and the highest chroma 77.64 can be reached when L* = 37.63. The high partial correlation coefficients L*ab  E*ab = 0.974 and C*ab  E*ab = 0.971 reveal that both L*ab and C*ab are not affected by the lightness of jadeite and are equally important to E*ab. It is concluded that the quality estimation of green color of Jadeite Jade should be primarily based on lightness which is the most intuitive factor and consistent with the color perception, and then followed by the evaluation of chroma and hue.

Cathode-Ray Tube Color Perceptible Color Difference Threshold Evaluation in Visual Color Matching

2008 ◽  
Vol 28 (3) ◽  
pp. 599-603 ◽  
Author(s):  
黄敏 Huang Min ◽  
廖宁放 Liao Ningfang ◽  
刘浩学 Liu Haoxue ◽  
徐艳芳 Xu Yanfang
Keyword(s):  
Color Difference ◽  
Difference Threshold ◽  
Color Matching ◽  
Visual Color ◽  
Cathode Ray Tube

Color-Difference Threshold for Printed Images

2013 ◽  
Vol 469 ◽  
pp. 236-239
Author(s):  
Hao Xue Liu ◽  
Gui Hua Cui ◽  
Min Huang ◽  
Bing Wu ◽  
Yu Liu
Keyword(s):  
Color Difference ◽  
Psychophysical Experiment ◽  
Difference Threshold ◽  
Test Image ◽  
Color Distribution ◽  
Difference Formula ◽  
Color Differences ◽  
The Mean ◽  
Image Pairs ◽  
Test Color

Five ISO 400 images were used as test images and a method of limits psychophysical experiment was designed to test color-difference threshold in printed images. The color appearance of each original image was modified by an exponential function for CIELAB lightness and chroma, an offset function for CIELAB hue at 20 steps for each attributes respectively. The modified images and their originals were paired to form the test image pairs. The mean color differences of image pairs, ranged from 0 to 4 CIELAB units, were calculated by CIELAB color-difference formula and nearly uniformly divided into 21 grades for each attributes. The test image pairs were assessed in a CPC-8n lighting booth. 12 normal color vision observers took part in the experiment. The experimental results showed that the mean color-differences threshold for lightness, chroma and hue attributes were 1.49, 1.53 and 0.78 CIELAB units showing the threshold for hue was apparently smaller than that of lightness and chroma, and the thresholds of different images were dependent on the image content or color distribution.

Measurement of Neural Contrast Sensitivity Function of Human Eyes Based on Visual Chart and Wave-front Aberration

2010 ◽  
Vol 39 (4) ◽  
pp. 662-668
Author(s):  
葛婧菁 GE Jing-jing ◽  
王肇圻 WANG Zhao-qi ◽  
刘涛 LIU Tao ◽  
王雁 WANG Yan ◽  
赵堪兴 ZHAO Kan-xing
Keyword(s):  
Wave Front ◽  
Contrast Sensitivity ◽  
Sensitivity Function ◽  
Contrast Sensitivity Function ◽  
Human Eyes

scholarly journals Color difference threshold determination for acrylic denture base resins

2015 ◽  
Vol 26 (s1) ◽  
pp. S35-S43 ◽  
Author(s):  
Jiabao Ren ◽  
Hong Lin ◽  
Qingmei Huang ◽  
Qifan Liang ◽  
Gang Zheng
Keyword(s):  
Color Difference ◽  
Difference Threshold ◽  
Denture Base ◽  
Threshold Determination

Study on New Measurement Method for Visual Contrast Sensitivity

2013 ◽  
Vol 433-435 ◽  
pp. 877-881
Author(s):  
Ji Yan Zhang ◽  
Bao Yu Hong ◽  
Wen Li Liu ◽  
Tao Geng Zhou
Keyword(s):  
Contrast Sensitivity ◽  
Measurement Method ◽  
Research Result ◽  
Optical Path ◽  
Integrating Sphere ◽  
Real Time Control ◽  
Measuring Device ◽  
Human Eye ◽  
Time Control ◽  
Visual Contrast

Contrast sensitivity measurement is widely used in clinical ophthalmology to evaluate visual function of the human eye, and of great significance for early diagnosis and identification of ophthalmic diseases. On the basis of contrast sensitivity definition, current measurement method was analyzed. By analyzing the existing principles and shortcomings of the human eye contrast sensitivity methods, a new method for generating observation targets of contrast sensitivity was proposed. By using double optical path design idea with integrating sphere and self-developed brightness adjustment systems, two beams of uniform light with specific luminance could be produced. With subsequent reuse of the optical path, accurate measurement of eye contrast sensitivity could be achieved, and calibration of contrast sensitivity tester widely used in clinical practice could be solved by developing assistant transfer tools. Moreover, output parameters of this method could be precisely adjusted according to the need as a result it ccould achieve real-time control and calibration. The research result has set the foundation for future establishment of visual threshold measuring device which is especially suitable for scientific and experimental research in clinical ophthalmology and metrology.

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