Update README.md

README.md

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 <div align="center">
     <a href="https://yyfz.github.io/pi3/">
-        <img src="https://huggingface.co/yyfz233/Pi3/resolve/main/assets/main.png" width="90%">
+        <img src="https://huggingface.co/yyfz233/Pi3/resolve/main/main.png" width="90%">
     </a>
     <p>
         <i>$\\pi^3$ reconstructs visual geometry without a fixed reference view, achieving robust, state-of-the-art performance.</i>