Limits of super-resolution  [Baker & Kanade, 2002]
	Performance degrades significantly beyond 4x or so Doesn’t matter how many new images you add • space of possible (ambiguous) solutions explodes quickly Major cause • quantizing pixels to 8-bit gray values Possible solutions: • nonlinear techniques (e.g., L1) • better priors (e.g., using domain knowledge) – Baker & Kanade “Hallucination”, 2002 – Freeman et al. “Example-based super-resolution”