Template Matching

Finding a patch in a picture — and why a raw difference score is fooled by a light switch.

5 tasks

1. Score Every Position at Once
2. The Score That Lies
3. Normalize It
4. Hoist What Never Changes
5. Payoff: Present or Absent?

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This page is an interactive exercise — the editor, the GPU runner and your saved progress need JavaScript. The text above is the full brief.