MULTI-SPECTRAL AND HYPERSPECTRAL IMAGE FUSION USING 3-D WAVELET TRANSFORM

Image fusion is performed between one band of multi-spectral image and two bands of hyperspectral image to produce fused image with the same spatial resolution as source multi-spectral image and the same spectral resolution as source hyperspeetral image. According to the characteristics and 3-Dimensional （3-D） feature analysis of multi-spectral and hyperspectral image data volume, the new fusion approach using 3-D wavelet based method is proposed. This approach is composed of four major procedures： Spatial and spectral resampling, 3-D wavelet transform, wavelet coefficient integration and 3-D inverse wavelet transform. Especially, a novel method, Ratio Image Based Spectral Resampling （RIBSR）method, is proposed to accomplish data resampling in spectral domain by utilizing the property of ratio image. And a new fusion rule, Average and Substitution （A＆S） rule, is employed as the fusion rule to accomplish wavelet coefficient integration. Experimental results illustrate that the fusion approach using 3-D wavelet transform can utilize both spatial and spectral characteristics of source images more adequately and produce fused image with higher quality and fewer artifacts than fusion approach using 2-D wavelet transform. It is also revealed that RIBSR method is capable of interpolating the missing data more effectively and correctly, and A＆S rule can integrate coefficients of source images in 3-D wavelet domain to preserve both spatial and spectral features of source images more properly.     

多光谱颜色复制技术若干关键问题的研究

针对当前颜色复制理论与技术的四大根本缺陷,提出了多光谱颜色复制技术的理论及技术途径,并系统探讨了多光谱颜色复制技术的五大关键问题,即多光谱采集系统的建立与优化、多光谱图像的融合、光谱信息的重建、多光谱显示与打印以及光谱颜色管理标准的建立,最后探讨了多光谱颜色复制技术的主要研究方向以及未来的应用前景。     

基于遗传算法的混合像元快速分解及分类算法

在深入研究混合像元分解原理的基础上,提出了用遗传算法进化模型拟合分解结果的超平面,以实现混合像元分解并进一步分类的算法。给出了用该方法对多光谱图像中混合地物进行分类的实例。实验结果证明:该算法的结果与全约束最小二乘(FCLS)的混合像元分解算法结果相近(相关系数达到0.99),而计算复杂度大大降低,计算速度明显提高且具有较强的适应性。同时在整幅遥感图像的分类中体现出较高的分类性能,为遗传算法在混合地物分类问题中的应用提供了又一条可行的途径。