C# Windows Phone-对背景中的位图图像使用快速模糊效果

我有封面图片的艺术家，我在页面中心使用200x200分辨率。我想把这个图像也复制到背景上，但要改变它，这样用户就可以识别颜色和一些大的形状。我不确定哪个名字在英语中有这种效果。我认为有些东西是虚幻、平滑之类的

我发现这段代码符合我的要求：

coverBitmap.ImageOpened += (s, args) =>
{
  var wb = new WriteableBitmap((BitmapImage)s);
  var newHeight = 800;
  wb = wb.Resize(newHeight, newHeight, WriteableBitmapExtensions.Interpolation.Bilinear);
  wb = wb.Crop(new Rect(160, 0, 480, 800));
  wb = wb.Convolute(WriteableBitmapExtensions.KernelGaussianBlur5x5);
  var brush = new ImageBrush {ImageSource = wb};
  LayoutRoot.Background = brush;
};

问题是，对于KernelGaussianBru5x5，它仍然过于精确。我为19x19创建了自己的矩阵：

var array = new[,]
                {
                    {16, 17, 19, 20, 21, 22, 23, 24, 24, 24, 24, 24, 23, 22, 21, 20, 19, 17, 16},
                    {17, 19, 20, 22, 23, 24, 25, 26, 26, 26, 26, 26, 25, 24, 23, 22, 20, 19, 17},
                    {19, 20, 22, 24, 25, 26, 27, 28, 28, 28, 28, 28, 27, 26, 25, 24, 22, 20, 19},
                    {20, 22, 24, 25, 27, 28, 29, 30, 30, 30, 30, 30, 29, 28, 27, 25, 24, 22, 20},
                    {21, 23, 25, 27, 28, 29, 31, 31, 32, 32, 32, 31, 31, 29, 28, 27, 25, 23, 21},
                    {22, 24, 26, 28, 29, 31, 32, 33, 33, 33, 33, 33, 32, 31, 29, 28, 26, 24, 22},
                    {23, 25, 27, 29, 31, 32, 33, 34, 34, 35, 34, 34, 33, 32, 31, 29, 27, 25, 23},
                    {24, 26, 28, 30, 31, 33, 34, 35, 35, 36, 35, 35, 34, 33, 31, 30, 28, 26, 24},
                    {24, 26, 28, 30, 32, 33, 34, 35, 36, 36, 36, 35, 34, 33, 32, 30, 28, 26, 24},
                    {24, 26, 28, 30, 32, 33, 35, 36, 36, 36, 36, 36, 35, 33, 32, 30, 28, 26, 24},
                    {24, 26, 28, 30, 32, 33, 34, 35, 36, 36, 36, 35, 34, 33, 32, 30, 28, 26, 24},
                    {24, 26, 28, 30, 31, 33, 34, 35, 35, 36, 35, 35, 34, 33, 31, 30, 28, 26, 24},
                    {23, 25, 27, 29, 31, 32, 33, 34, 34, 35, 34, 34, 33, 32, 31, 29, 27, 25, 23},
                    {22, 24, 26, 28, 29, 31, 32, 33, 33, 33, 33, 33, 32, 31, 29, 28, 26, 24, 22},
                    {21, 23, 25, 27, 28, 29, 31, 31, 32, 32, 32, 31, 31, 29, 28, 27, 25, 23, 21},
                    {20, 22, 24, 25, 27, 28, 29, 30, 30, 30, 30, 30, 29, 28, 27, 25, 24, 22, 20},
                    {19, 20, 22, 24, 25, 26, 27, 28, 28, 28, 28, 28, 27, 26, 25, 24, 22, 20, 19},
                    {17, 19, 20, 22, 23, 24, 25, 26, 26, 26, 26, 26, 25, 24, 23, 22, 20, 19, 17},
                    {16, 17, 19, 20, 21, 22, 23, 24, 24, 24, 24, 24, 23, 22, 21, 20, 19, 17, 16}
                };

我不确定我是否做对了。我从WinForm应用程序的Microsoft示例中找到了一个示例，结果是双[，]，所以我乘以10000 a，然后将其保存为int[，]。但当我把这个应用到我的代码中时，创建新图像需要几秒钟，我仍然希望它更模糊

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那个么，有并没有一种方法可以快速调整图像的大小、扩展和裁剪，然后模糊污迹，使其平滑？谢谢

查看诺基亚图像SDK