Ms. Defen Chen Profile

Defen Chen

at Beijing Institute of Technology

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Proceedings Article | 12 January 2018 Paper

Spectral colors capture and reproduction based on digital camera

Defen Chen, Qingmei Huang, Wei Li, Yang Lu

Proceedings Volume 10620, 106200G (2018) https://doi.org/10.1117/12.2295287

KEYWORDS: Digital cameras, Calibration, RGB color model, Color difference, Cameras, Spectrophotometry, Color reproduction, Error analysis, Light sources, Spectral calibration

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The purpose of this work is to develop a method for the accurate reproduction of the spectral colors captured by digital camera. The spectral colors being the purest color in any hue, are difficult to reproduce without distortion on digital devices. In this paper, we attempt to achieve accurate hue reproduction of the spectral colors by focusing on two steps of color correction: the capture of the spectral colors and the color characterization of digital camera. Hence it determines the relationship among the spectral color wavelength, the RGB color space of the digital camera device and the CIEXYZ color space. This study also provides a basis for further studies related to the color spectral reproduction on digital devices. In this paper, methods such as wavelength calibration of the spectral colors and digital camera characterization were utilized. The spectrum was obtained through the grating spectroscopy system. A photo of a clear and reliable primary spectrum was taken by adjusting the relative parameters of the digital camera, from which the RGB values of color spectrum was extracted in 1040 equally-divided locations. Calculated using grating equation and measured by the spectrophotometer, two wavelength values were obtained from each location. The polynomial fitting method for the camera characterization was used to achieve color correction. After wavelength calibration, the maximum error between the two sets of wavelengths is 4.38nm. According to the polynomial fitting method, the average color difference of test samples is 3.76. This has satisfied the application needs of the spectral colors in digital devices such as display and transmission.

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