使用双线性内插值算法实现图像缩放

       /// <summary>
       /// 图像缩放函数,算法：双线型内插值算法
       /// </summary>
       /// <param name="imgSrc">要处理的图像Image<Bgr, Byte></param>
       /// <param name="width">目标宽度</param>
       /// <param name="height">目标高度</param>
       /// <returns>返回结果</returns>
       private Image<Bgr, Byte> convert(Image<Bgr, Byte> imgSrc, int width, int height)
       {
           Bitmap oldBmp = imgSrc.Bitmap;
           Bitmap newBmp = new Bitmap(width, height);
           float kc = ((float)imgSrc.Width) / width;
           float kr = ((float)imgSrc.Height) / height;
           Image<Bgr, Byte> newImg = null;
           for (int x = 0; x < width; x++)
           {
               for (int y = 0; y < height; y++)
               {
                   //双线型内插值算法
                   int x_des = (int)Math.Floor(x * kc);
                   int y_des = (int)Math.Floor(y * kr);

                   float x_weight = x * kc - x_des;
                   float y_weight = y * kr - y_des;
                   Color color11 = oldBmp.GetPixel(x_des, y_des);
                   Color color12;
                   Color color21;
                   Color color22;
                   Color color;
                   if (x_des + 1 < oldBmp.Width && y_des + 1 < oldBmp.Height)