css实现照片模糊效果类似毛玻璃效果

<img class="blur" src="test.jpg" />

.blur {
filter: url(blur.svg#blur);
-webkit-filter: blur(3px);
-moz-filter: blur(3px);
-ms-filter: blur(3px);
filter: blur(3px);
filter: progid:DXImageTransform.Microsoft.Blur(PixelRadius=10, MakeShadow=false);
}

<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
<filter id="blur">
<feGaussianBlur stdDeviation="3" />
</filter>
</svg>