Abstract:

Aiming at solving single and expensive peoblem of current color measurement equipment, the feasibility of the prediction of the difference in fabric color difference measurement using a digital camera were studied. First, the self-designed image acquisition system with a digital camera were used to capture sample images. Secondly, the original RCB response information was extracted from RAW format image. Finally, a non-linear regression model between original RCB response information and CIE L*a*b* was used to measure the sample color. Then, the difference of fabric color difference was predicted. The experiment results of 480 color card samples shows that the number of parameters of the nonlinear regression model constructed is not as good as possible, and its validity depends on the specific parameters selected. The model was also applied to CNCS textile color card and dyed fabric, showing that the average color difference errors are 1.16 and 1.34, respectively, which is close to the results of DigiEye with a high consistency. The regression model designed in this paper has good feasibility in the prediction and evaluation of fabric color difference.

Key words: digital color measurement, fabric color difference, color difference prediction, spectrophotometer