Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 73-80.doi: 10.13475/j.fzxb.20191204208

• Textile Engineering • Previous Articles     Next Articles

Comparison of spectral imaging and spectrophotometry in fabric color measurement

QIU Kebin1, CHEN Weiguo1,2(), ZHOU Hua2   

  1. 1. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Shangyu Industrial Technology Research Institute Co., Ltd., Zhejiang Sci-Tech University, Shaoxing, Zhejiang 312300, China
  • Received:2019-12-18 Revised:2020-08-04 Online:2020-11-15 Published:2020-11-26
  • Contact: CHEN Weiguo E-mail:wgchen@zstu.edu.cn

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Abstract:

In order to address the problem in color difference between spectrophotometry and spectral imaging when measuring the same fabric, Datacolor 600 spectrophotometer, Datacolor Spectravision and hyperspectral imaging system HIS were chosen to measure the same set of monochromatic cotton knitted fabrics. The reasons and mechanisms for the difference in color and in spectral reflectance measured by the three instruments were discussed. The color difference and spectral similarity between different instruments were calculated, and the data were analyzed by Pearson correlation coefficient method. The results show that HIS has good repeatability with the average color difference being 0.154. The spectral reflectance measured by the three instruments have strong similarity. Compared with Spectravision, the chromatic value of HIS is closer to the spectrophotometer. Spatial feature information is the main factor affecting the color and spectral reflectance. The pixel size of Spectravision are smaller, and Spectravision has a lower brightness due to the influence of shadow of yarns and fabric texture. The pixel size of HIS are proportional to the distance between the camera and the specimen, and HIS is applicable to a broader range.

Key words: fabric, color measurement, spectral imaging, spectrophotometry, color difference, spectral reflectance

CLC Number: 

  • TS101.9

Fig.1

Image acquisition method of spectral imaging. (a) Area scan; (b) Line scan"

Fig.2

Structure of hyperspectral imaging system"

Tab.1

Color values of plain knit cotton fabric"

样品编号 颜色 L* a* b* c h
1# 棕 39.28 14.32 20.28 24.83 54.78
2# 深棕 20.21 13.23 6.84 14.89 27.34
3# 蓝 35.86 -1.84 -38.73 37.94 270.49
4# 深蓝 23.18 11.07 -33.92 35.68 288.07
5# 白 88.60 1.12 10.86 10.92 84.12
6# 紫 24.40 17.46 -28.56 33.47 301.44
7# 绿 44.43 -42.49 17.89 44.91 156.16
8# 黄 73.84 21.58 77.50 80.45 74.44
9# 橘黄 52.46 55.99 52.23 76.56 43.01
10# 红 38.25 55.14 31.86 63.68 30.02
11# 深红 28.09 43.45 -1.84 43.49 357.58
12# 黑 12.58 0.54 -1.18 1.3 294.58
13# 灰 21.51 -1.12 -5.00 5.12 257.37

Tab.2

Color differences of different instruments"

样品编号 Spectravision 与 Datacolor 600对比 HIS 与 Datacolor 600对比
ΔE00 ΔL Δc Δh ΔE00 ΔL Δc Δh
1# 0.925 -0.437 0.649 -0.493 0.655 -0.188 0.109 -0.618
2# 1.788 -0.516 1.655 -0.440 1.211 -0.312 -1.080 -0.449
3# 0.616 -0.490 0.297 0.569 0.396 -0.323 0.266 0.377
4# 1.074 -0.512 0.498 1.194 0.484 -0.201 -0.589 -0.310
5# 3.618 -1.436 -2.930 1.563 2.272 1.012 1.164 1.667
6# 1.090 -0.546 0.559 0.931 0.673 -0.433 -0.537 -0.220
7# 0.227 -0.215 0.065 -0.031 0.441 -0.234 0.227 0.298
8# 2.053 -0.916 -0.564 1.748 1.955 1.031 1.366 -0.946
9# 0.937 -0.502 -0.393 0.686 1.402 0.714 1.103 0.487
10# 0.574 -0.470 0.177 0.278 0.985 0.529 0.798 0.231
11# 0.707 -0.529 0.459 -0.099 0.641 -0.153 0.029 0.621
12# 3.502 -0.804 2.935 1.734 0.758 -0.262 0.125 -0.700
13# 2.528 -0.547 0.123 2.465 0.486 -0.385 0.139 -0.262
最小值 0.227 0.436 0.177 0.031 0.396 0.153 0.029 0.220
最大值 3.618 1.436 2.935 2.465 2.272 1.031 1.366 1.667
平均值 1.510 0.609 0.870 0.941 0.951 0.444 0.579 0.553

Fig.3

Fabric image of Spectravision and HIS. (a) Image of Spectravision; (b) Image of HIS"

Tab.3

Result of exponential spectral angle mapper between different instruments"

样品编号 Spectravision与
Datacolor 600对比		 HIS与
Datacolor 600对比
1# 0.973 0.916
2# 0.950 0.912
3# 0.974 0.981
4# 0.959 0.969
5# 0.951 0.968
6# 0.958 0.948
7# 0.979 0.983
8# 0.968 0.966
9# 0.951 0.961
10# 0.957 0.962
11# 0.962 0.946
12# 0.897 0.940
13# 0.935 0.921

Fig.4

Specimen reflectance curve between Datacolor 600 spectrophotometer and Spectravision"

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