资源三号卫星和SPOT6卫星融合影像对比分析

Contrast Analysis of Fusion Image Between Satellite ZY-3 and SPOT6

鉴于目前尚无对ZY-3和SPOT6融合影像的对比分析研究,该文在对SPOT6影像空间分辨率进行指标分析的基础上,通过融合效果分析评价,对比不同卫星的影像质量差异。选取ZY-3和SPOT6北京城区南部地图重叠影像作为实验区域,以GXL-PCI软件平台为主,配合桌面版PCI,对ZY-3和SPOT6影像进行正射纠正、配准、融合、裁切,以及生产标准卫星影像。结果表明,SPOT6分辨能力未能达到标称的1.5m,其实际的分辨率应在1.9m左右。在2.1m同一分辨率下,ZY-3与SPOT6影像整体效果比较接近,其中,SPOT6影像对比度更强,清晰度更高,但细节特征有所损失;ZY-3影像更好地保留了原始影像信息,在灰度值反差不大的区域,对地物的细节表现力更强。

This paper tries to identify image quality based on image information analysis of satellite ZY-3 and SPOT6 in distinct resolution. South Beijing was selected as the test area. GXL-PCI and PCI software were used in this research. After Ortho rectification, registration, fusion and cutting,a standard satellite image was produced. It can be seen that the resolution of SPOT6 failed to achieve 1.5m,but the actual one should be at about 1.9m,based on the comparison of basic parameters between ZY-3 and SPOT6. However,through the image index analysis and typical image discrimination in the same resolution of 2. lm between them, it can be seen that the overall effects of images are closer to each other. With higher image contrast and definition,SPOT6 images lose some features of details. But relatively speaking, ZY-3 performs better in preserving original image information,especially with a more expressive ability for ground objects in the small gray value contrast region.