说明：  双线性插值，又称为双线性内插。在数学上，双线性插值是有两个变量的插值函数的线性插值扩展，其核心思想是在两个方向分别进行一次线性插值。 双线性插值作为数值分析中的一种插值算法，广泛应用在信号处理，数字图像和视频处理等方面。
(Bilinear interpolation, also known as bilinear interpolation. Mathematically, bilinear interpolation is a linear interpolation extension of the interpolation function with two variables. The core idea of bilinear interpolation is to perform one linear interpolation in two directions. Bilinear interpolation, as an interpolation algorithm in numerical analysis, is widely used in signal processing, digital image and video processing.)