双边滤波（Bilateral filter）是一种可以保边去噪的滤波器。之所以可以达到此去噪效果，是因为滤波器是由两个函数构成。一个函数是由几何空间距离决定滤波器系数。另一个由像素差值决定滤波器系数。-Bilateral filter (Bilateral filter) is a security edge de-noising filter. The reason why this denoising effect can be achieved because the filter is constituted by two functions. Determines the filter coefficient is a function of the distance from the geometric space. Another filter coefficients is determined by the pixel difference.