Color difference evaluation and calculation method of different-color-difference-grade color samples

A calculation method and technology of color difference, which is applied in the field of color difference evaluation and calculation of color samples with different color difference grades, can solve the problems of mismatching application range of color difference formulas used in testing, low visual matching degree of calculation results, etc., and achieve threshold color difference range improvement , the effect of performance improvement

Inactive Publication Date: 2013-10-09
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art, to propose a color difference formula suitable for the calculation of different color differences, to avoid the mismatch between the different color difference levels and the application range

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  • Color difference evaluation and calculation method of different-color-difference-grade color samples
  • Color difference evaluation and calculation method of different-color-difference-grade color samples
  • Color difference evaluation and calculation method of different-color-difference-grade color samples

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Embodiment Construction

[0038]For 2776 pairs of samples of the BFD color difference data set in the classic color difference data set, the visual color difference and calculated color difference scatter distribution diagrams were drawn, and the linear and power exponential equations were used to fit the visual color difference and calculated color difference respectively. It was found that the power exponential equation was used to describe visual color difference and calculation. Color difference fits the relationship between physical stimuli and psychophysical sensations, and is better than linear equations. Optimize the power exponent equation for different color difference formulas to determine the a and b coefficients in the power exponent equation. On the one hand, the goal of optimization is to adjust the calculated color difference through the a value to keep it on the same scale as the visual color difference, and on the other hand, to adjust the calculated color difference through the b valu...

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Abstract

The invention relates to a color difference evaluation and calculation method of different-color-difference-grade color samples. The method comprises the steps that a BFD data group is selected; a scatter point distribution diagram of a vision color difference value delta V and a CIELAB color difference calculation value of sample pairs is drawn; linear fitting and Stevens' power exponent equation S=aIb fitting are respectively conducted on the scatter point distribution diagram; power exponent equation optimization is conducted on different color difference formulas through selection of power exponent equations; another fifteen color difference data groups are selected, color difference values of the different color difference grade data groups and a STRESS value of the color difference value and vision color difference are calculated through optimized color difference formulas; the performance of the color difference formulas before and after being optimized is evaluated through an F inspection method; a and b values of different color difference formulas are acquired after the situation that the sixteen color difference data groups are affected with an optimized result is synthetically considered; a calculation method which is suitable for different color difference formulas and is used for evaluating color sample color differences with different color difference grades is established.

Description

technical field [0001] The invention relates to a color difference evaluation and calculation method for color samples of different color difference grades. By determining the calculation coefficients of different color difference formulas, the color difference calculation and evaluation of color samples of different color difference grades is performed. Background technique [0002] The accurate reproduction and evaluation calculation of color is a very important and basic research in color science. When implementing color management and evaluating the color of different samples, it is necessary to calculate the color difference of color to achieve the purpose of color control. For a long time, the CIELAB color difference formula is commonly used in the printing field to calculate the color difference, and the CMC color difference formula is used in the textile industry to calculate the color difference. However, the correlation between these color difference formulas and hu...

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Application Information

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IPC IPC(8): G01J3/46
Inventor 黄敏崔桂华刘浩学
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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