多光谱遥感之最佳波段选择

本文提出一种以提供最大信息量为准则的最佳遥感波段选择方法.由于不同波段信号之间存在较强的相关性, 因此本方法从地面主要目标的光谱特性出发, 计算出所有可能使用波段之间的全部相关系数.假设信号是近似正态分布的, 就可以从相关矩阵的行列式计算出每个波段的条件信息量.比较各种可能波段组合的信息量, 就可以找出最佳的波段组合.文中也介绍了一种比较简单的方法, 可以得到“准最佳”的波段选择.最后, 对遥感卫星设计时遥感波段的选择问题做了一些探讨. 

The Selection of Optimum Spectral Channels for Multispectral Remote Sensing

So far there is no theoretically effective method for the selection of optimum spectral channels for multispectral remote sensing. In this paper a new method is proposed which is based on the criteria of maximum information. As strong correlation exists among signals in different spectral channels, this factor must ibe seriously considered during the computation of amount of information. Prom the measured spectral characteristics of main ground objects, mutual correlation factors of all spectral channels are computed. If signals are supposed to be normally distributed, then by computing determinants of correlation matrices, conditional information of each channel signal can be obtained. By comparing the total amount of information of every possible combination of channels, the optimum combination can be found. When the number of possible channels is too large, the computation process may be very complex and time comsuming. Asimple method is also recommended which can give "quasi-optimum" selection of spectral channels. An example is shown for illustration, and the result is compared with the experimental result in foreign literature. Some comments are made by the author for the design of future remote sensing satellite mutisipectral systems.