小波系数插值支持下的遥感影像混合像元分解

Spectral Unmixing of Remote Sensing Images Using Interpolation of Wavelet Coefficients

针对遥感混合像元分解中不能有效利用空间邻域信息的问题,提出一种基于超分辨率重建的分解方法.通过小波系数双线性插值获得遥感影像的超分辨率影像,对超分辨率影像进行监督分类生成超分辨率分类图,最后通过窗口统计得到原始分辨率下各地物的丰度图.广州城区的模拟TM遥感影像试验表明,该方法的分解精度在3种方法中最优,能够较充分利用空间邻域信息,提高混合像元分解精度,为混合像元分解提供了新的途径.

This paper proposes a wavelet coefficient interpolation method, which uses the neighboring inforl mation in the spatial domain for spectral unmixing of remote sensing images. A super-resolution image is first generated using bilinear interpolation of wavelet coefficients. The new image is then classified to derive a super-resolution classification map. Finally, an abundance map at the original spatial resolution is obtained using a counting window on the super-resolution classification map. This way, the original image is unmixed. A simulated TM image of Cuangzhou City is used to verify the proposed method. It is found that the method performs best among three methods as it can make use of neighboring information in the space to improve unmixing accuracy.