空间分辨率之比对遥感图像融合质量的影响

Effect of Spatial Resolution Ratio on Optical Remote Sensing Image Fusion Quality

本文主要探讨光学遥感图像融合中空间分辨率之比对融合质量的影响。采用IKONOS-2全色与多光谱图像,通过重采样的方法模拟空间分辨率之比连续变化的融合输入数据,并进行Gram-Schmidt融合实验,补充已有成果中空间分辨率之比变化不连续、融合方法单一的现状。结果表明:当空间分辨率之比降低时,融合质量随着下降,实际应用中,多光谱图像的空间分辨率越高越好;当空间分辨率之比很小时,应适当降低全色图像的空间分辨率,以减弱融合图像的光谱变形,提高融合质量;此外,即使空间分辨率之比很小,融合后图像也比融合输入多光谱图像的清晰度高,更利于图像判断与后续处理。

The effect of spatial resolution ratio on the quality of optical remote sensing image fusion was discussed. By simulating images with continuous resolution ratio from IKONOS-2 panchromatic and multispectral images, experiments were carried out on Gram-Schmidt pan-sharpening method provided by ENVI V4.4, which could be seen as a complement of existing achievements. Results show that fusion quality deteriorates as the spatial resolution ratio decreases so that the spatial resolution of multispectral should be as high as possible in applications, and that the panchromatic image will need to be down-sampled to perform better fusion quality if the spatial resolution ratio is too small. Furthermore, fusion results have better quality than their original multispectral images even at the situation of a very small spatial resolution ratio.