According to local gradient information, wavelet low frequency coefficient obtained from source image is selected to compose respective low frequency coefficient of the fused image.
根据局部梯度信息对源图像的小波低频系数进行选择，获取融合图像的对应低频系数。
Furthermore, the size of the sub-image in wavelet domain is a quarter of the source image, so the convergence speed of our method is faster.
此外，高频子图像的大小为原图的四分之一，因此计算量大大减少，算法的收敛速度更快。
Furthermore, the size of the sub-image in wavelet domain is a quarter of the source image, so the convergence speed of our method is faster.
此外，高频子图像的大小为原图的四分之一，因此计算量大大减少，算法的收敛速度更快。
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