中文说明：
分别利用均值滤波、自适应滤波和中值滤波对噪声图像g1和g2进行滤波，利用峰值信噪比对去噪性能进行比较。
English Description：
The noise images G1 and G2 are filtered by mean filter, adaptive filter and median filter respectively, and the denoising performance is compared by peak signal-to-noise ratio