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遥感图像融合方法研究
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摘要
遥感图像融合研究作为图像融合领域的一个重要分支,主要是研究如何综合利用不同航空遥感传感器所获取的图像信息,产生新的图像,以获取对同一事物或目标更为全面、客观及本质的认识。近二十年来,引起了世界范围内的广泛关注和研究热潮,成为解决海量数据的一种有效手段,尤其是随着IKONOS、Quick Bird、SPOT-5等高分辨率遥感卫星的相继发射,遥感卫星图像的空间分辨率得到了很大的提高,使得高分辨率遥感图像的应用范围更加广泛。遥感图像融合的目的是充分利用多个待融合源图像中包含的冗余信息和互补信息,将这些信息智能化合成,产生比单一图像信息更精确、更可靠的描述和判决,融合后的图像应该更适合于人类视觉感知或计算机后续处理。本文主要针对高空间分辨率全色图像和多光谱图像的融合方法进行了研究。主要工作如下:
     (1)首先讨论了遥感图像融合的历史发展和研究现状,综述了常用的遥感图像融合方法,并比较了各种方法的特点。
     (2)图像预处理是进行融合前非常重要的一个阶段,其误差大小直接关系到融合图像的质量,因此,图像预处理是遥感图像融合的前提和基础。本文概述了图像预处理的方法,对遥感图像的几何校正、图像配准和直方图匹配进行了简要的介绍。本文从主观和客观两个方面介绍了目前对融合图像的评价标准,特别在客观评价标准上,分别从单一融合图像的统计特征、融合图像与标准参考图像的关系和融合图像与原始图像的关系三个方面对评价参量进行了分类总结。
     (3)小波分析具有多分辨率分析特征,小波在图像分析和处理方面具有很大的优越性,在分析总结了前人的融合算法的基础上,提出了将小波变换应用到遥感图像融合中。由于图像的局部特征往往不是由一个像素所能表征的,它是由某一局部区域的多个像素来体现的,同时,通常图像中某一局部区域内的各像素之间往往有较强的相关性,因此,这种基于像素的融合规则带有很大的片面性,其融合效果也有待改善。提出了基于区域能量的融合方式可以克服上面所说的片面性,而且可以获得更好的视觉效果,使融合图像细节更丰富,更清晰。为了最大限度的保留两幅图像中的重要信息,对多光谱和高分辨率遥感图像来说,既要保留原多光谱图像中的地物光谱信息,又要引入高分辨率图像中的细节纹理信息,提出了一种基于小波变换的自适应融合新算法。通过实验验证了该方法的有效性。
     (4)Contourlet是一种新的多尺度几何分析工具,比小波变换更加适合分析二维图像中的曲线或直线状的边缘特征,而且具有更高的逼近精度和更好的稀疏表达能力。本文在研究了Contourlet变换原理和性质的基础上,提出了基于Contourlet变换的图像融合方法,将全色图像和多光谱图像进行Contourlet分解,然后在相应尺度上利用融合规则将Contourlet系数进行融合,最后进行重构得到融合图像。同时提出了一种基于小波-Contourlet变换的融合新算法,以及基于Contourlet变换的自适应融合新算法。实验结果验证了该方法的有效性。
As an important branch of the image fusion, remote sensing image fusion mainly investigates how to integrate image information from the different remote sensing sensors, and generate new images in order to get more complete, objective and essential cognition for the same thing or target. In recent twenty years, it has been a very popular research area, and becomes efficient means to solve the large number data. Especially with the launch of high-resolution remote sensing satellite like IKONOS, Quick-Bird and SPOT-5, the resolution of remote sensing image is higher than before, and the application of the remote sensing images have been more useful. The purpose of image fusion is to utilize the complementary and redundant information in multi-source images, to synthesize information intelligently, and to produce more compete and more reliable description and decision than one image, in order that the fused image should be more suitable for human visual perception or computer further processing. In this paper, most of the research works focus on the fusion method between panchromatic (Pan) image and multispectral (MS) images. The following are the main contents:
     (1) The developing of history and research situation of remote sensing fusion are discussed, and many traditional remote sensing fusion algorithms are summarized and compared.
     (2) Image preprocessing technique is a very important stage before fusion, its error directly related to the quality of the fusion image, therefore, image preprocessing is the prerequisite and basis for remote sensing image fusion. This paper briefly summarizes the image preprocessing techniques and introduces the geometry correction, image registration and histogram matched. This paper introduces the subjective and objective evaluation criteria, especially on the objective evaluation criteria, the evaluation parameters are classified from three aspects which are the statistic characteristics of a single fusion image, the relationship between the fusion image and the standard reference image, and the relationship between the fusion image and the original images.
     (3)Wavelet analysis has multi-resolution characteristics, and has been widely used in the image fusion field. In the paper analylsis the used method in the image fusion field by wavelet, So in this part a image rule of pixel and the image rule of region energy was proposed,and which would select coefficients auto-adapted,which solved the question simultaneously. and the experimental results show the effectiveness of the method.
     (4)Contourlet is more appropriate for analyzing the image edges such as curve or linear characteristics than wavelet transform, and it has better approximation precision and sparsity description. In this paper, the second generation Contourlet transform theory and property are researched, and the image fusion method based on the second generation Contourlet transform is proposed, the panchromatic image and multi-spectral images are decomposed using Contourlet transform, then the Contourlet coefficients are fused with the fusion regular in the corresponding scales, and finally the fused coefficients are reconstructed to obtain fusion images, the image rule of self-adaptive was proposed,and which would select coefficients auto-adapted,which solved the question simultaneously.Remote sensing images are taken as experimental data, and the experimental results show the effectiveness of the method.
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