当原图像像素点处于边缘区域时，沿Sobel算子确定的边缘方向进行自适应插值，当原图像像素点处于非边缘区域时，采用双线性插值法进行插值。-When the original image pixel is in the edge area, along the Sobel operator to determine the edge direction of adaptive interpolation, when the original image pixels in the non edge