Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 42-48.doi: 10.13475/j.fzxb.20200205307

• Textile Engineering • Previous Articles     Next Articles

Digital cashmere color measurement and its application in length measurement

HENG Chong1,2, SHEN Hua1,2, WANG Fumei1,2()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China
  • Received:2020-02-26 Revised:2020-06-30 Online:2020-12-15 Published:2020-12-23
  • Contact: WANG Fumei E-mail:wfumei@dhu.edu.cn

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Abstract:

In photoelectric measurement of fiber length, the dependence of fiber transmittance and reflective signals on fiber brightness remains to be a problem. In order to characterize objectively the color category of cashmere and test the cashmere length precisely, a color measurement device based on color optocoupler(CCD) principle was developed. Through the transformation of color model in the three-color spaces, the distribution of cashmere of three colors in the three-dimensional color space was obtained. The conversion model between the optical parameter apparent reflectance (reflectance rate with infinite sample thickness) and brightness parameter was established based on the experiment results. The research shows that the clump density and surface density curve are accurately calculated with the apparent reflectance values obtained with the established method, which could be used in the length measurement of cashmere by photoelectric method. The color measurement method has the advantages of having large area, good representativeness and low cost, so it is able to be used for color measurement of fibers and textiles.

Key words: photoelectric colorimetric method, color space conversion, cashmere length measurement, optical signal, colored cashmere

CLC Number: 

  • TS117

Fig.1

Reflection(a) and spectrogram of photodetector light source(b) of cashmere"

Fig.2

Schematic diagram of color measurement device"

Fig.3

Distribution of three colors of cashmere in CIE Lab color space"

Fig.4

Intra-sample distribution range in color parameters of three colors of cashmere. (a) Values of L; (b) Values of a; (c) Values of b"

Fig.5

Intra-sample variation in color of cashmere. (a) Variation values of color parameters; (b) CV values of color parameters"

Fig.6

Reflection property of cashmere. (a) Reflection obtained by datacolor; (b) R∞ of cashmere"

Fig.7

Relationship between L value and R∞ of cashmere"

Fig.8

Length measurement result comparision of cashmere based on CCD device and manual length method. (a) White cashmere; (b) Grey cashmere; (c) Brown cashmere"

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