摘要
高频调制融合法是一种应用较广的影像融合方法,其技术关键在于设计合适的低通滤波器。通常的滤波是在空间域进行的,笔者提出在频域中采用Butterworth滤波器进行低通滤波。文中给出了SPOT全色影像和TM多光谱影像的融合结果,通过与常用的几种融合方法得到的影像比较,证明了提出的方法在提高原TM多光谱影像空间分辨率的同时,较好地保留了多光谱影像频道的光谱信息,并且信息量也有很大提高。
Highfrequency modulating fusion is one of the widely application methods in practice, and the key of it is to design the suitable lowfrequency filter. Typically, filtering is performed in spatial domain. In this paper, Butterworth filter in frequency domain is put forward. Then, contrast of several fusion methods to merge SPOT panchromatic image and TM multispectral image, shows that method referred in this paper keeps the spectral quality more efficient and enhances the TM multispectral image'spatial resolution at the same time, furthmore information quantity is improved.
基金
陕西省教育基金项目(01JK195)
关键词
低通滤波器
影像融合
空间域
频域
low-pass filter
image fusion
spatial domain
frequency domain
