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Obtaining method of standard color atla for representing complexion and application of obtaining method

An acquisition method and standard color card technology, applied in the field of standard color card acquisition, can solve problems such as the inability to accurately reflect the skin color of the crowd, and the unsystematic data of the skin color card.

Active Publication Date: 2015-06-24
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for obtaining a standard color card for representing skin color, which solves the problem that the existing skin color card data is not systematic and cannot accurately reflect the skin color of the crowd

Method used

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  • Obtaining method of standard color atla for representing complexion and application of obtaining method
  • Obtaining method of standard color atla for representing complexion and application of obtaining method

Examples

Experimental program
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Embodiment 1

[0070] The tester's skin color value is X k =(h k YR, V k , C k ), where h k = 4.0, V k = 5.8, C k = 4.4.

[0071] 1) Calculate the hue coefficient:

[0072] because h k =4.0 is an integer, so formula (1) is used for calculation,

[0073] i.e. h B = h k -0.5, and h B =0.5m (m=0,1,3,5,...,13,15),

[0074] available h B = 3.5;

[0075] 2) Calculate lightness:

[0076] By formula (3) V B =V k , can get V B = 5.8;

[0077] 3) Calculate chroma:

[0078] because C k is an integer multiple of 0.4, so formula (4) is used for calculation,

[0079] i.e. C B =C k -0.2, and C B =2.6+0.4p (p=0,1,2...6,7),

[0080] So the chroma value C can be obtained B = 4.2.

[0081] To sum up, the calculated color value corresponding to the standard color card that conforms to the skin color of the testee is: X B =(3.5YR, 5.8, 4.2), and then find the corresponding color card according to the data for application.

Embodiment 2

[0083] The tester's skin color value is X k =(h k YR, V k , C k ), where h k =3.7, V k = 5.7, C k = 4.1.

[0084] 1) Calculate the hue coefficient:

[0085] because h k is not an integer, so use the formula (2) to calculate,

[0086] That is, |h k -h B |B =0.5m (m=0,1,3,5,...,13,15),

[0087] So you can get h B = 3.5;

[0088] 2) Calculate lightness:

[0089] Formula (3) V B =V k , can get V B = 5.7;

[0090] 3) Calculate chroma:

[0091] because C k is not an integer multiple of 0.4, so use formula (3) to calculate,

[0092] That is, |C k -C B |B =2.6+0.4p (p=0,1,2...6,7),

[0093] C available B = 4.2.

[0094] To sum up, the calculated color value corresponding to the standard color card that matches the skin color of the subject is X B =(3.5YR, 5.7, 4.2), and then find the corresponding color card according to the data for application.

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Abstract

The invention discloses an obtaining method of a standard color atla for representing complexion. The obtaining method particularly includes the following steps that firstly, complexion data are collected, and the tri-attribute value of the color is recorded as Xi=(Hi, Vi, Ci); secondly, the data are analyzed, namely the tri-attribute HVC value of the complexion tested in the first step is analyzed; thirdly, the standard complexion data value and the corresponding color atla are obtained. The invention further discloses a method for judging the complexion of people through the standard color atla. The method includes the particular steps of collecting the complexion of an object to be judged, comparing and calculating the data of the complexion with standard complexion data, obtaining the standard complexion value corresponding to the object to be tested, and finding the corresponding standard color atla. The obtaining method of the standard color atla for representing complexion and the application of the obtaining method resolve the problems that existing complexion atla data are not systemic and can not accurately reflect the complexion of people.

Description

technical field [0001] The invention belongs to the technical field of skin color digitalization, and relates to a method for acquiring a standard color card used to represent skin color. The invention also relates to a method for classifying and judging human skin color by using the standard data of skin color. Background technique [0002] In 1905, the American colorist Munsell proposed for the first time to use the three attributes of hue, lightness and chroma to express colors objectively. Color system, Japanese color research color system, Swedish NCS color system, Chinese color system, etc. The objective representation methods of these colors provide a scientific basis for the formation of a digital color supply chain. [0003] The spectrophotometer can directly read the three attribute values ​​of the object color, creating conditions for the accurate reproduction of the color. When the designer selects a certain color, the three attribute values ​​of the color are ...

Claims

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Application Information

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IPC IPC(8): A61B5/103
CPCA61B5/1034
Inventor 薛媛齐静张译丹
Owner XI'AN POLYTECHNIC UNIVERSITY