基于HIS小波变换和MOPSO的全色与多光谱图像融合

Multi-spectral and panchromatic image fusion based on HIS-wavelet transform and MOPSO algorithm

有效的全色图像和多光谱图像的融合方法必须保证光谱和空间信息的最大化.采用HIS小波融合算法框架,提出了新的高频系数提取方法和一种新的全色和多光谱图像融合方法.根据小波变换后高频中的细节以及边缘信息都具有方向性,而噪声点一般都是孤立点这一物理特性,设计了一种基于—阶高斯微分的高频系数提取方法.以多个融合评价指标为目标函数,对HIS小波融合算法中采用不同融合规则得到的结果图像,通过多目标粒子群优化算法优化加权组合得到最终结果.对实际TM多光谱图像和SPOT全色图像进行了融合实验比较研究,结果表明,改进的高频系数提取方法得到的融合图像在光谱信息和空间信息上都有较好的改善,用多目标粒子群优化算法得到的结果图像在光谱信息保留上具有较明显的优势且空间信息也得到了较大的提高.

Effective fusion method of remote sensing multispectral and panchromatic image must ensure maximizations of spectrum and space information. Using the fusion algorithm framework with combining HIS transformation and wavelet transform （HIS-wavelet）, in this paper we propose a new method to extract high frequency coefficients and a new multispectral and panchromatic image fusion method by using multi-objective particle swarm optimization （MOPSO） algorithm. According to the physical characteristics that the edge information in the high frequency has the nature of direction and noise points in the high frequency are generally isolated, a high frequency coefficient extraction method based on Gauss first order differential is proposed. The final resulting image is optimally combined by two images obtained by using different fusion rules in HIS-wavelet. Multiple fusion evaluation indicators are used as object functions and the MOPSO algorithm is used to find the optimal weights. The experiments on TM multi-spectral image and SPOT panchromatic image are carried out. Experimental results demonstrate that the improved method has a better improvement in spectral and spatial information. At the same time, the resulting image which is obtained using MOPSO algorithm has obvious advantages in retaining the spectral information and the spatial information is also greatly improved.