Motivation ™ Archeology Reconstruct broken artifacts ™ Molecular Biology Identify compatible proteins ™ Forensics Understand disaster scene Goal Help user to reconstruct 3D object from a large collection of pieces

Approach 1. Detect interest regions and compute local descriptors

2. Identify candidate descriptor correspondences

3. Quantify geometric compatibility between parts

4. Compute final match score using spectral methods

Motivated by [Leordeanu & Hebert, 2005] Results Database of solid objects, each broken into four pieces

System correctly identifies the pieces for each object

™ 100 piece database ™ High retrieval accuracy at low ranks ™ Robust to noise

™ Accuracy at low ranks is crucial metric to evaluate retrieval ™ Significantly out- performs baseline at varying noise levels