<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100%" height="100%">
  <defs>
    <filter filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse" id="flt" x="0" y="0" width="50" height="100">
      <feImage xlink:href="#img" />
    </filter>
  </defs>
  <rect filter="url(#flt)" width="50" height="100"/>

  <g transform="translate(50 0)">
    <g id="img">
      <rect width="50" height="100" fill="green"/>
    </g>
  </g>
</svg>