光谱反射比的实际删节方法研究

为了将测量间隔较小的光谱反射比数据删节或者压缩成间隔较大的数据,给出了三种方法,即：直接选取法、线性删节法和三阶删节法,并对其特性进行了仿真验证.从仿真的结果可以看出：若将测量间隔为5 nm的数据压缩成间隔为10 nm、20 nm或30 nm的数据,则采用三阶删节方法误差最小;若将测量间隔为10 nm的数据压缩成间隔为20 nm或30 nm的数据,则直接选取法似乎结果更好一些.另外,还给出了三阶删节方法与"向量子空间法"在光谱图像压缩方面的特性比较,比较的结果发现,三阶删节方法要比"向量子空间法"更好一些.可以看出,删节方法无论是对光谱反射比的删节还是对光谱图像的压缩,其结果都能很好的满足工业需求.

Practical Methods for Abridging Spectral Reflectance

The direct selection,linear,and third order reflectance abridgement methods are discussed and tested. It is found that the third order method is the best when abridging reflectance from 5 nm to 10 nm,20 nm or 30 nm intervals,while the direct selection method is the best when abridging reflectance from 10 nm to 20 nm or 30 nm. In addition,it's found that abridgment methods are comparative to Vector Subspace Method when the spectral image compression application is considered. The tested and compared results show that the methods can be used in practice when the reflectance abridgement or spectral image compression is required.