基于多光谱成像的光谱反射率重建

一些对颜色重现要求较高的应用领域需要获取目标表面上各点的光谱反射率。大多数天然物质表面的光谱反射率曲线比较平滑,可视为几个基向量的线性组合。基于这一原理的多光谱成像技术可以准确快速地重建目标表面的光谱反射率。通过对NCS色卡进行主成分分析,得出了彩色印刷品光谱反射率的基向量。建立了一个多光谱成像系统,用以比较基向量个数不同对反射率重建效果的影响。

Spectral reflectance recovery based on multispectral imaging

In some high_precision color reproduction applications, there is a need to obtain spectral reflectance of each point on the object's surface. Since the vast majority of reflectance spectra for surfaces are smooth functions, each reflectance spectrum can be represented as the weighted sum of basis functions. Mutispectral imaging technology based on this principle can recover spectral reflectance accurately and quickly. A principal component analysis was made to obtain basis functions of reflectance. And a multispectral imaging system was set up to analyze the result of spectral reflectance recovery for different amount of basis functions.