关键词: 图像融合, 非下采样Contourlet变换, à, trous小波变换, 特征量积, 决策因子

Abstract: A fusion scheme for multispectral image and panchromatic image is proposed, based on Intensity, Hue, and Saturation（IHS）transform and Nonsubsampled Directional Filter Bank（NSDFB） included in nonsubsampled contourlet transform which provides a full shift-invariant directional multi-resolution trait, combined with the superiority of àtrous transform. In view of the fusion rule of the traditional details injection method which causes larger spectral distortion, the characteristic product is chosen to express local image features for the high-frequency component obtained by the transform in this paper, and then the details of panchromatic image are extracted on the basis of the threshold of the decision-making factor, eventually effective high-frequency detail surface acquired by NSDFB inverse transform is attached to the component of multispectral image. The experimental results show that, the algorithm in this paper makes the spectral distortion minimum and makes correlation coefficient maximum, and improves the spatial detail quality largely in a variety of different performance index evaluations.

Key words: image fusion, nonsubsampled Contourlet transform, àtrous wavelet transform, characteristic product, decision-making factor