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    <filter filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse" id="flt" x="0" y="0" width="50" height="100">
      <feImage xlink:href="#img" />
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    <rect filter="url(#flt)" width="50" height="100"/>

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