设置源房产的形象呢不块运行的线程直到下载完成，代码将继续执行，你将进度条看不见的立即。
Setting the Source property on Image does not block running thread till download completes so code will continue executing and your progress bar will be invisible immediately.
为了形象的说明滤波效果，代码执行后可以看到滤波前后滤波后的对比图像。
Filtering effect to the image description, code execution before and after filtering can be seen after comparison of the filtered images.
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