基于小波-全相位方向滤波器组变换的多聚焦图像融合

Multi-focus Image Fusion Using Wavelet-based All Phase Directional Filter Bank Transform

利用全相位方向滤波器组良好的多方向性和平移不变性的特征,提出一种基于小波-全相位方向滤波器组变换的多聚焦图像融合方法。对不同聚焦图像进行小波-全相位方向滤波器组变换,采用加权平均算子对低频系数进行融合,采用局部方差准则对各个方向上的高频系数进行融合,对融合后的系数进行重构,得到高低频比例升高的融合图像。实验结果表明,与其它多聚焦图像融合算法相比,该方法显著减少均方根误差的值,提高峰值信噪比的值,使得融合图像效果好。

Using multi-direction and shift-invariance characteristics of all phase directional filter bank,an multi-focus image fusion algorithm using wavelet-based all phase directional filter bank transform is proposed.First the wavelet-based all phase directional filter bank transformation to the different focusing image is made,then the weighted averaging operator is used to carry on the fusion to the low frequency coefficient,the local variance criterion is used to carry on the fusion to each direction high frequency coefficient.Finally,to reconstruct the coefficient of fusion,the fusion image in which the high and low frequency proportion elevates is obtained.The experiment results show that,the method significantly reduces the RMSE value,improves the PSNR value,and makes that the fused image is of good effect.