| Summary: | 碩士 === 國立臺灣師範大學 === 圖文傳播學系 === 106 === The industry such as printing technology, image communication and other exten-sively use of color as media are relying on color reproduction to reproduce color. This technique keep updating and changing with the progress of technology. Nowadays, due to the diversification of media, cross-media color management become more and more important. Multispectral images can fully recode spectral information of the ob-ject and provide color appearance under different conditions, is the future of color reproduction. However, spectra reflectance is not easy available, so researchers are trying to reconstruct spectral reflectance with tristimulus values.
In this study, the spectral reflectance of the object was reconstructed by using the sRGB values which were commonly used in the current digital images. A set of mod-el-based metameric spectra of extreme points was designed to solve the problem of the interpolation reconstruction method, the calculation of interpolation method was extended to sRGB color space. The reconstructed spectral reflectance of the object were evaluated by RMSE, GFC and color difference.
There were three experiments in this study, reconstructed spectra reflectance of color chips, reconstructed whole sRGB color space, reconstructed multispectral imag-es. The results showed that MMSEP can effectively expand the calculation range of interpolation method to whole sRGB color space, MMSEP + LI method and MMSEP + NNI method (collectively, MMSEP interpolation method) more conform to the tar-get spectrum than PCA method in the curve shape of spectral reflectance. The MMSEP interpolation method showed a small increase in color difference when the light source was replaced. However, in transforming digital images into multispectral images, the reconstructed results of MMSEP interpolation method were poor. The shapes of spectral curve were different, and had large color difference on some pixels.
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