多光谱与全色图像融合方法的研究
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摘要
为使多光谱与高空间分辨率全色图像的融合效果在努力保持光谱信息的同时尽可能提高其空间分辨率,论文主要对多光谱与全色图像融合算法进行了深入研究,通过大量的融合实验得到了一系列有价值的结论,完成了一定的创新性工作,具体的工作内容如下:
     在多分辨率分析的特征匹配基础上,提出了一种基于Mallat小波变换与空间投影结合的图像配准算法。该算法采用投影匹配原理将二维数据变为一维进行匹配计算,降低了配准所需要的时间。另外,采用逐层细化的分层搜索策略可减少匹配误差从而提高配准精度。
     在综合分析àtrous小波变换和Curvelet变换的优点基础上,提出了一种基于àtrous-Curvelet变换的融合算法。分解后的系数依据所在高,低频层的不同特点,采取多重加权规则进行融合。该算法能在保留多光谱图像光谱信息的基础上,有效地提高融合图像的空间分辨率。
     针对遥感图像影像分辨率低的问题,提出了一种基于区域模糊推理的NSCT域融合算法。该算法有效地克服了传统融合方法中存在的融合图像模糊,抗噪能力差的缺点。
     针对传统脉冲耦合神经网络(PCNN)模型参数无法自动设定的难题,结合lαβ彩色空间转换,提出了一种基于双通道自适应PCNN的图像融合算法。该算法充分考虑到像素间的相关性及噪声突变的影响,融合效果优于多尺度分析方法。
Remote sensing data have different spatial resolution, spectral resolution and time-phasic resolution. Image fusion technology can combine their respective advantages in order to make up for information loss of single image, enhance image information analysis capabilities, and improve target classification accuracy and dynamic monitoring range. For the some outstanding problems of multispectral and panchromatic fusion algorithm such as the conflict between improving spatial resolution and maintaining spectral quality, this thesis makes analysis and research from the pixel level, feature level and decision-making level, and then puts forward the corresponding solution. The main research content and innovative results are as follows:
     1. In the aspect of image pre-processing, with regard to the difficulty of structure extract in registration algorithm, a novel image registration algorithm based on space projection in Mallat wavelet domain is proposed. As for low-frequency components, space projection character matching is used, and then the results of matching are applied in the high-frequency components to achieve coarse-fine matching, while as for the highest resolution component, normalized cross-correlation matching is used , finally the simulation results are given and analyzed. Experimental results show that according to space projection principle, the proposed algorithm convert two-dimensional data into one-dimensional 0-1 character string to matching comparison, which not only can reduce search space, but also greatly decline registration time. In addition, the hierarchical search strategy with layer by layer can reduce the matching error and improve registration accuracy. Compared with the common registration algorithms of cross-correlation and Hausdorff distance, the proposed algorithm is dominant both in the registration time and matching accuracy, which is ready for image fusion in the next phase.
     2. In the aspect of pixel level fusion, with regard to low resolution of fusion image, two multi-scale decomposition tools—àtrous wavelet transform and discrete Curvelet transform are firstly introduced into image fusion field, and then with the advantages of translation invariance inàtrous wavelet transform and multi-orientation decomposition in Curvelet transform, a novel image fusion algorithm based onàtrous- Curvelet transform is proposed, which is combined with IHS color space conversion. Different weighted fusion rules are adopted according to coefficient features of high and low frequent layer. The conditional weighted fusion rules that regional characteristics product as active measurement and correlation coefficient as matching degree are adopted in high frequent section, while the average weighted rules are used in low frequent section. Finally, the fusion image can be achieved by IHS inverse transform. Experimental results show that the proposed algorithm can effectively improve spatial resolution of fusion image on the basic of retaining spectral information, and then fusion effect of this algorithm is better than that of other multi-resolution analysis algorithms. In addition, space and spectral quality usually depends on threshold selection, so choosing proper threshold should be based on different applications and characters of original images.
     3. In the aspect of feature level fusion, the current fusion rules that the largest absolute value selection rule the weighted average rules have some disadvantages such as loss of fusion information and sensitivity to noise. In order to overcome these shortcomings and let fusion image contain much information of original images, a novel image fusion algorithm based on fuzzy reasoning in NSCT domain is proposed, which is combined with IHS color space conversion. Fusion rule setting of this algorithm is confirmed according to reginal features of NSCT transform coefficients, through the introduction of fuzzy reasoning principle to determine weighted value of the corresponding coefficients of original images. Experimental results show that the proposed algorithm both in suppressing spectral distortion and improving spatial quality is superior to the current fusion algorithms based on multi-resolution analysis, and then can overcome the shortcomings of poor anti-noise capability in traditional fusion rules. On the one hand, as a new multi-scale geometric transformation, NSCT has better direction selectivity and translation invariance, which can fully reflect image geometric information. On the other hand, adopting the weighted fuzzy reasoning fusion rules can effectively solve some uncertainties problems, and then these rules can be also extended to medical and other areas of image fusion.
     4. In the aspect of decision-making level fusion, with regard to high computational complexity of multi-resolution analysis algorithm, a novel image fusion algorithm based on dual-channel adaptive PCNN is proposed. Firstly, the multispectral image is converted from RGB space to lαβspace that is more in line with color transmission character. Next, the achromatic channel (l )image and panchromatic image are adaptively decomposed by simplifying tralditional PCNN model and defining image definition as the coupled joint coefficient, and then the largest entropy ignition time series are sent to decision factor to achieve the new achromatic channel image. Finally, fusion image is acquired by lαβinverse transform onαcomponent,βcomponent of original multispectral image and the new achromatic channel component (l ). Experimental results show that the proposed algorithm can not only solve the difficult problem on how to set traditional PCNN parameters automatically, but also with view to the correlation among pixels set and noise impact, fusion effect of this algorithm is better than that of other mutiresoluion fusion algorithms such as wavelet transform both on subjective and objective evaluation. Meanwhile, this algorithm can reduce the computational complexity.
引文
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