In the first stage of Wiener filtering,the noisy image is decomposed by SWT.Then,the signal variances of wavelet coefficients are estimated in the elliptic windows.

• 在第一次局部维纳滤波中,用静态小波变换对含噪图像进行分解,然后利用椭圆方向窗来估计不同方向子带的各点信号的方差;