Abstract: Contourlet Transform（CT） is a new multi-resolution transform，which can give an asymptotic representation of edges and contours in image by virtue of its characteristics of multidirection，flexible multiscale.A image fusion algorithm is proposed based on CT，and cycle spinning is introduced to decrease the shift-variance of the transform.The experimental results show that the fusion scheme is effective and the fused images are better than that of using the laplacian pyramid transform and the Wavelet transform.

Key words: image fusion, Contourlet Transform（CT）, Cycle Spinning, wavelet transform

摘要： Contourlet变换（Contourlet Transform，CT）是一种新的多尺度变换，具有良好的多尺度性和多方向性。提出了一种基于Contourlet变换的多聚焦图像融合算法，同时引入Cycle Spinning来有效地消除由于Contourlet变换缺乏平移不变性而产生的图像失真。实验结果表明该算法可获得较理想的融合图像，取得了优于laplacian塔型方法和小波变换方法的融合效果。

关键词: 图像融合, Contourlet变换, 循环平移, 小波变换