模糊濾鏡 feGaussian Blur（基本）

<svg width="900px" height="400px" viewBox="0 0 900 400">
   <defs>
      <filter id="basicGaussian">
         <feGaussianBlur stdDeviation="5"/>
      </filter>
   </defs>
        
   <image xlink:href="https://upload.wikimedia.org/wikipedia/commons/a/af/Fruit_Stall_in_Barcelona_Market.jpg" x="20px" y="20px" width="300px" height="200px" preserveAspectRatio="xMinYMin meet" />
   <image filter="url(#basicGaussian)" xlink:href="https://upload.wikimedia.org/wikipedia/commons/a/af/Fruit_Stall_in_Barcelona_Market.jpg" x="340px" y="20px" width="300px" height="200px" preserveAspectRatio="xMinYMin meet"/>
</svg>

（ 源影象通過 Daderot 在維基共享資源）